Report of Correlating Committee on ' Mobile Homes and Recreational Vehicles · 2016-03-09 ·...

8 0 0 MOBILE HOM_____~S XND RECREATIONAL VEHXCLES MH-1

Report of Correlating Committee on ' Mobile Homes and Recreational Vehicles

The Report of the Correlating Committee on Mobile Homes and Recreational Vehicles and its 4 Sectional Committees is pre. sented in 4 major Parts, with each Part subdivided into 2 Sections.

The reason for separating each Part into 2 Sections is that the electrical provisions of each of the 4 Parts were developed through an Intersectional Committee Electrical Task Force which worked closely with Code-Making Panel No. 19 of the National Electrical Code Committee " to harmonize" the provisions relating to Mobile Homes, Mobile Home Parks, Recreational Vehicles, a n d Recre. ational Vehicle Parks with Articles 550 and 551 of the National Electrical Code. Balloting was done separately on the electrical provisions due to the sequencing of the availability of the revisions.

Explanation of Proposed Revisions

Part I. Proposed Revisions to the Standard for Mobile Home Parks (NFPA No. 501A - - 1973). Part IA contains proposed revisions to update the Standard except for Part 8. These revisions include some editorial refinements (Items 1, 2, 3, 4, 6, 8, 9, 10, 19, 23, and 26); changing some of the permissive language to mandatory requirements (Items 5, 7, 20, 21, 22, 24, 25, 27, and 28); introducing substantive new or revised material (Items 11, 12, 13, 14, 15, 16, 17, 18 and 27). Revisions to Part 8 (Mobile Home Park Electrical Systems), to correlate with the Proposed 1974 National Electrical Code, are covered in Part IB of this Report.

Part H. proposed Revisions to the Standard for Mobile Homes (NFPA No. 501B - - 1973). Part I IA contains proposed revisions for all portions of the Standard except Part E. There are 104 separate "I tems" in these Proposed Revisions; Item 1 concerns Part A (General); Items 2-32 concern Part B (Body and Frame Design and Construction) ; Items 33-64 concern Part C (Plumbing Systems); and Items 65-104 concern Part D (Heating, Cooling, and Fuel Burning Systems). Significant n e w material is contained in Items 3, 14, 16, 19, 26, 31, 43, 57, 59, 64, 67, 75, 77, 78, 79, 81-84, 86, 87-92, and 96-100. Revisions to Part E (Electrical Systems), to correlate with the Proposed 1974 National Electrical Code, are covered in Part l i b of this Report.

E X P L A N A T I O N O F R E P O R T 801

part HI. Proposed Revisions to Standard for Recreational Vehicles (NFPA No. 501C - - 1972.) Part I IIA contains proposed revisions to update the Standard except for Part III . There are 93 separate "I tems" in these Proposed Revisio/ts; Items 1--4 concern the Introductory Chap te r (Definitions Common to Parts

IV); Items 5-61 concern Part I (Plumbing Systems); Items 62-92 concer Part II (Heaung Systems); and Item No. 93 pro- poses new Part IV (Fire and Life Safety). Significant n e w material is contained in Items 3, 5, 10, 11, 16, 23, 27, 31, 34, 35, 40, 46, 47, 52-53, 55-56, ~8, 611 ' 63, 68, 70, 72, 76, 77 (Table); 78, 80, 81, 82, 84- , , - ; portions of Item 92 and Item 93. Re- visions to Part I I I (Electrical Systems) are covered in Part I IIB of this Report.

part IV. Proposed Standard for Recreational Vehicle Parks (lqFPA No. 501D), formerly Electrical Standard for Recrea- tional Vehicle Parks (NFPA No. 501D - - 1971). Part IVA contains proposed new material for Chapters 1, 2 (except some definitions previously in 510D - - 1971), 3, 4, and 5. Chapter 6 (Elec- trical Systems) has been revised to correlate with the Proposed 1974 National Electrical Code and appears in Part IVB of this Report.

Explanation of ANSI Status

This Committee activity operates under the aegis of the American National Standards Institute under the joint sponsorship of the Mobile Home Manufacturers Association, the National Fire Pro- tection Association, the Recreational Vehicle Institute, and the Trailer Coach Association with the NFPA acting as the Admini- strative Secretariat.

The 1973 edition of NFPA No. 501A was approved as ANSI Al19.3 on December 28, 1973. The 1973 edition of NFPA No. 501B was approved as ANSI Al19. 1 on January 17, 1974. The 1972 edition of NFPA No. 501C was approved as ANSI Al19.2 on April 19, 1973. The 1971 edition of NFPA was approved as ANSI A177.2 on June 20, 1972 and was redesignated as ANSI A119.4 as of December 21, 1973.

Vote Statements

Part I of the Report contains proposed revisions of NFPA No. 5 0 1 A - 1973 (ANSI Al19.3 - - 1973).

Part IA, of the 32 voting members .oaf tahiti Sectional Commi'ttee, O n . . . . . . ivelv 1 has voted neg t~vely (Mr. Smithman),

7 members have votea a.O~m u" ~' • 21t,,,¢ asked to be recorded as not voting (Mr. Palmer) and 3 ballots ha~e' not~een returned to the date of this report. Mr. Smithman has voted nega. tively in the belief that afu(.tl~,r co,.elation is ~e.ded on utility connection locations with the Sectionat ~ommzttee on Jvloo:te Homes.

On p a r t IB, concerning the electrical provisions oaf the Standard, of the 32 voting members, 21 have voted affirmatively, 0 negatively, 4 wished to be recorded as not voting, and 7 ballots have not been returned to date.

Par t I I of the Report contains the Proposed Revisions of NFPA No. 501B - - 1973 (ANSI All9.1 - - 1974).

On Par t HA, oaf the 43 voting members of the Sectional Committee, 32 members have voted a~rmatively, 6 negatively, and 5 ballots have not been returned up to the date oaf this report. Those voting negatively art Messrs. Cummings, Dell, Gross, Latter, Smithman, and Van ~andt. Messrs. Cummings, Dell, Gross, Latter, and Van ~andt object to Item 59 in tl~ Report (and related Items 33, 57, and 64c.). Mr. Cummings also objects to Item 26. Mr. Gross also objects to the absence oaf a mechanism to de. termine the adequacy oaf cooling requirements and inadequacies regarding the proposed criteria on solid afuel-burning fireplaces and fireplace stoves. Mr. Smithman votes negatively on Item 26 but his objections are not as yet clearl 3 understood.

On Par t HB ~ the Report, concerning the electrical provisions oaf the Standard, oaf the 43 voting members of the Sectional Committee, 24 hart voted affirmatively, I negatively (Mr. Smith), 5 wished to be recorded oz not voting, and 13 ballots have not been returned to date. Mr. Smith's negative vote concerns objections to Paragraphs 3.11(b), 4.3 and 4.4 and 9.4.3. The objections to 3. l / (b) , 4.3 and 4.4 would be altered if a lffrma. tively correlated with Code-Making Panel No. 19 of the National Elec. trical Code Committee. The objection to 9.4.3 is that it is not identical with Par. 23.4.3 of the present text.

Par t H I of the Report contains proposed revisions of NFPA No. 501C - - 1972 (ANSI Al19.2 - - 1973).

O n Pa r t IHA~Of the 36 voting members oaf the Sectional Committee, 29 have voted afftrmatively, 0 negatively, 1 asked to be recorded as not voting (Mr. Palmer), and 6 ballots have not been returned up to the date of this report.

On Pa r t I I IB, concerning the electrical provisions oaf the Standard, oJ the 36 voting members oaf the Sectional Committee 1 19 members have voted

803 - -4 E X P L A N A T I O N O F R E P O R T

afflrmatibely, 2 negatively (Messrs. Ewig and Moses), 3 have asked to be r~orded as not voting, and 12 ballots have not been returned up to date ot this report. Mr. Ewig would like to add to Paragraph 4.4 a warning sign to be installed in the battery compartment reading:

"Do not disconnect battery while converter is plugged into 110 voltage."

Mr. Moses votes negatively because he believes new material ShouM be added on using the metal frame or chassis oJ reoeational vehicles as a return path to ground .for low-voltage fixtures and appliances with appropriate "safeguards. He also recommends revisions to Paragraphs 4.4, 4.5.1, 4.5.3, 5.2, and 7.10.7. Mr. Radigan of theRecreational Vehicle Institute serves as an alternate to Mr. R. E. Klingler who has not returned his ballot. Mr. Radigan voted negatively and his.negative vote will be intluded if Mr. Klingler does not respond to the ballot request. Mr. Radigan's negative vote is because of objections to 4.5.3, 5.2, 6.6, Z#.t.3, 7.4. Ld, Z16.3, 7.18.3, 11.1.1 and 12.1.

Part IV of the Report contains a complete revision of NFPA No. 501D - - 1971 (ANSI A119.4 - - 1972; a redesignation from A177.2 - - 1972).

On Par t IVA~ o~ the 32 voting members of the Sectional Committee, 29 have voted a~rmatively, 0 negatively, and 3 ballots have not been returned up to the date oJ this report.

Part IVB, concerning the electrical systems in the Standard for Recre- ational Vehicle Parks, of the 32 voting members of the Sectional Committee, 22 have voted affirmatively, 0 negatively, 3 have asked to be recorded as not voting, and 7 ballots have not been returned up to the date of this report.

An update of these ballot reports will be given at the meeting. The votes of those Correlating Committee members who serve

on one or more of the Sectional Committees are counted in the votes of the Sectional Committee. The following tabulation reports the votes of the Correlating Committee members who do not serve on the Sectional Committee responsible for the referenced Standard :

NTPA No. 501A. Of the 10 eligible members, 5 voted affirmatively, one voted negatively (Mr. Smith), one wishes to be recorded as not voting (Mr. Keplinger), and three ballots have not been returned (Mr. Baker, Mr. Nerem, and Mr. Wanzek).

NTPA No. 501B. o f the 2 eligible members, both voted affirmatively.

8 0 4 MOBILE HOMES AND RECREATIONAL VEHICLES M H - 5

NFPA No. 501C. Of the 5 eligible members, 3 voted affirmatively • ) one wishcs to bc recorded as not voting (Mr. Kephnger), and one ballot has not been returned (Mr. Wanzek).

NFPA No. 501D. Of the 8 eligible members, 5 voted affirma. tivcly, onc wishes to be recorded as not voting (Mr. Keplinger), and two ballots have not been returned (Mr. Baker andMr.Wanzek).

Electrical Provisions of Noa 501A, 501B, 501C, 501D. Of the 19 members of the Correlating Committee all voted aWtrmative|y on each, except Mr. Smith voted negatively on NFPA No. 50lB.

Committee on Mobile Homes and Recreational Vehicles.

Correlating Committee.

Lloyd W. Garner, Chairman, Georgia State Firemen's Association, Inc., 730 Church Street, Decatur, GA 30030

George H. Tryon, t Adminietrati~e Secretary, National Fire Protection Association, 470 Atlantic Ave., Boston, MA 02210

LeRoy V. Abbott, MarketDyne Interns- tional, Incorporated (Chairman, Sectional Committee on Recreational Vehicle Parks)

Russell R. Bahr, State of California, partment of Houaing and Community De- velepment (Chairman, Sectional Com- mittee on Mobile Homes)

Harry L. Baker, State of Oregon, Depart- ment of Commerce

Attic O. Barker, Idaho State Electrical Board (rep. National Electrical Code Com- mittee" International Association of Elec- trical inspectere)

C. E. Biome, American Aa~qeiation of Re- tired Persons

Edward J. Dwyer, E. J. Dwyer Company (rep. American Society of Mechanical En- g~rs)

Tom S. Gable, National Sanitation Founda- tion

James G. Grees, Office of Housing Tech- nology, National Bureau of Standards, U.S. Department of Commerce

tNenvoting

Kenneth C. Henke, Jr., State of Iowa, Offiec of Planning and Programming, N~ tional Conference of States on Buildiag Codes and Standards

J o h n D , Hoaey, Foremost Insurance Co~ party (Chairman, Sectional Committee o~ Mobile Home Parks)

Walter H. Johnson, National LP-Gas A~ soeiation (Chairman, Sectional Committt* on Recreational Vehicles)

Duane E. Keplinger, Federal Housing Ad- minmtration, U.S. Department of Heal~ Education and Welfare

Norman Latter, International Assn. d Plumbing & Meehavical Officials

Marvin Nerem, Winnebago Industrle~ Recreational Vehicle Institute

W. J. Smith, Underwriters' Laboratori~, Inc.

Homer Staves, Kumpgrounds of Ameries C. P. Van Zandt, Sierra Craft, Trailer Cose~

Association Vinen Wanzek, Fleetwood Enterpri~e~

Mobile Homes Manufacturers Asseciati0~

M O B I L E HOMES AND R E C R E A T I O N A L V E H I C L E S

Nonvot inl i Members .

Fr~CiS E, Gt~eenleaf, Standards Director, Trailer Coach Association (Secretary, Sectional committee on Mobile Home Parks)

tlextrY Onmon, Standards Director, Mobile Homes Manufacturers Association (Secretary, Sestional Committee on Mobile Homes)

phil ip N. Shrake. Standards Director , l ~ . r e a t i o n a l Vehicle Institute, Inc. (secretary, ~eetionni Committee on necreational venictee and ~;ectmnal Committee on Recreational Vehicle Parks)

Sectional Committee on Mobile Home Parks

J o h n D. Hosey, Chairman, Foremost Insurance Company, P.O. Box 2450, Grand Rapids, MI 4954)1

Franc is E. Green lea f , t S~retary, Standards Director, Trailer Coach Association, 3856 East LaPalma Ave.,

Anaheim, CA 92806

LeRoY V. Abbot t , MarketDyne Interna- tional, InCOrporated

T R. Arnold, T. R. Am.old & Associates. "(rep. The Craltmen'e uuila)

Ted Baiter, Texas Mobile Home Association ArEfl udo O. Barker , Idaho State Eleetrical

(rep. National Etectncal Cede Com- mittns; International Association of Elee- tri¢~l Inspectors)

Herbert Be hre.nd, Lake Forcer, IL (rep. American ~oclety of Civil Engineers)

C E. Blome, American .~soeiation of Re- "tired persons

gdward Colleton, Trailer Coach Aaeociation Jane K a t h r y n Conrad , Denver, CO (rep.

Mobilehome Life) David Curley, Aetna Life and Casualty

(rsp. American tmmrance ~seocmUon) Edward J. Dwyer, E. J. Dwyer Company

(rep. American Society of Mechamcal En- s~ers)

William E a r t h m a n , D u k e Power Co. (rep. Electric Light and Power Group)


I~oyd W. Garner , Georgia State Firemen's Am>elation, Inc.

Howm'd L. Glasky, Trailer Coach Asso- ciation

John R, Gore, Jr . , Georgia State Fire Marshal (rep. Fire Marshals Association of North America)

Hans R. Grigo, National Safety Council & B. H e r m a n , Utah Dept. of Business

Regulations, Mobile Home & Recreational Vehisle Division

Charles J. Har t , National Electrical Con- tractors Association

Jordan He iman , Intertherm, Inc. (rep. American Society of Heating,,Relrigerating and Air Conditioning Engineers)

tNanvot~8

Freder ick F. Heieol, Minnesota State Dept. of Health (rep. Conference of State 8anl- tary. Engineers)

D. E. Hughes , Southern California Gas Company (rep. American Gas Association

Wal t e r H. Johnson , National LP-Gas As- soeiation

Char les W. Lane, Communities Inter- national

Nornum La t t e r , International Keaseiation of Plumbing and Mechanical Officials

R ichard Mi tche l l , Land Development, Mobile Homes Manufacturers Association

S a m u e l J . Morano, American Society of Sanitary Engineering

L. E. Pa lmer , Union Insulating Company, ~ National Electrical Manufacturers

iation) Dr. Mary S. P icket t , Iowa State University

(rep. Illuminating Engineering Society) M. W. S m l t b m a n , National Association of

Home Builde~ Pau l L. Solomon, California Dept. of

Housing and Community Development Ted L. Stressor, Nebraska Mobile Housing

Institute, Inc.

Alternates

R a l p h A. Brewster , American Insurance Association (Alternate to David Curley)

H. Ken t Glenn , Electric Light and Power Group (Alternate to William Earthman)

F. E. Hodgdon, American Gas Association (Alternate to D. E. Hughes)

T. A. Hook, National Association of Home Builders (Alternate to M. W. Smithman)

Nicholas A. LaConrte , American Soezety ot Heating, Refrigerating and Air Condition- ing Engineers, Inc. (Alternate to Jordan Heiman)

8 0 6 .MOBILE HOMES AND R E C R E A T I O N A L V E H I C L E S MH~ Nell MacLean , International Association of W . D . Mil ler , National Electrical Manuf~

Plumbing and Mechanical Officials (Alter- turers Association (Alternate to L nnto to Norman Latter) Palmer) " .

W. G. M a r t i n i ! ! , National Electrical K e n n e t h D. Rho ton , The Crafterae~a , Manufacturers Association (Alternate to Guild (Alternate to T. R. Arnold) L. E. Palmer)

Nonvot ing Members .

Wa l t e r N. Burke, Veterans Administration Clarence E. Cuyler , Div. of Community Management Systems. U.S. Dept. of Health. Ed~

cation and Welfare Donald F a l r m a n , Federal Housing Administration, U.S. Dept. of Housing.& Urban De.

velopment Wilford I. S u m m e r s , National Fire Protection Association George H. Tryon, National Fire Protection Association

• Sectional C o m m i t t e e on Mob i l e H o m e s

Russel l R. Bahr , Chairman, State of California. Department of Housing and Community Development

1500 Fifth Street. Sacramento, CA 95814

Henry Omson , t 8wrdary, Standards Director, Mobile Homes Manufacturers Association

14650 Lee Rood, Chantilly. VA 22021 r

LeRoy V. Abbot t , MarketDyne Intarna- tional Incorporated

T. R. Arnold , T. R. Arnold and Associates (rep. The Crnft~nen's Guild)

Cha r l e s Ashford, Mobile Homes Mnnufac- turers Association

Har ry L. Baker , State of Oregon Depart- ment of Commerce

Art la O. Barker , Ichtho State Electrical Board (rep. National Electrical Code Committee; International Association of Electrical Inspectors)

Don Barrow, Skyline Corp. (rep. Mobile Homes Manufacturers Association)

Herbe r t W. Behrend , Lake Forest IL (rep. American Society of Civil Engineers)

C. E. Blome, American Association of Re- tired Persons

J o h n C. Corney, Cerney and Ivey Aeso* eiates, Inc.

J a n e K a t h r y n Conrad , Denver, CO (rep. Mobilehome Life)

Orvi l le H. C u m m i n g s , Florida Dept. of Highway Safety and Motor Vehicles

David Cur ley , Aetna Life and Casualty (rsp. American Insurance Association)

W i l l i a m E. Dell , State of Washington, Dept. of Labor and Industries

Edward J. Dwyer, E. J. Dwyer Company (rep. American Society of Mechanical En- gineers)

W i l l i a m E a r t h m a n , Duke Power Co. (rep. Electric Light and Power Group)

tNonvoting

H. W i l l i a m Ewl~, Utica Mutual Iasursnee Company (rep. American Mutual lnsu~ a n t e Alliance)

T o m S. Gable, National Sanitation Founda. tlon

Lloyd W. Garner , Georgia State Ftreme~'s Association, Inc.-

Franc is E. Greenleaf , Trailer Coach A ~ . eiation

J o h n R . Gore, Jr., Georgia State Fire Ma~ ehals Association of North America)

Hans R. GHgo, Natmns~ Safety Council Verne R . Groendal , Miehi~Ln Cons01i. • dated Gas CO. (rep. Ameriesn Gas As~

cisfion) J a m e s G. Cross, National Bureau 0f

Standards, U.S. Department of Co~ meree

J o r d a n H e l m a n , Intertherm, Inc. (.~. American Society of Heating, Refrigerati~ and Air Conditioning Engineers)

Freder ick F. Helsal , Minnesota State DepL of Health (rep. Conference of State Sani- tary Engineers)

K e n n e t h C. Henke, Jr . , State of Iowa, Office of Planning and Programming (rep. National Conference of States on Building Codes and Standards)

J o h n D. Hosey, Foremost Insurance COrn. pany

W a l t e r H. Johnson , National LP-Gas A~ sociation

Aron Kllewer, Fleetwood Enterprises, Ine. (rep. Mobile Homes Manufacturers soeistion)

M O B I L E H O M E S AND R E C R E A T I O N A L V E H I C L E S 807 p Lan~jnead, Gas Appliance Manu-

Je.l~...r--.~ Association f ~ _ ~ ' l , a t t e l r , International Association

N e ~ b i n g and Mechanical OtEcials o~ rJ . J M e , m e American Society of

s ~ e.. e' "En~neeri~ ~ U t r y pa lmer . Union Insulating Company.

L. ~" National Electrical Manufacturers ~soeietion)

Mm~/S. p icke t t , Io~.va S.tete Umversity t~/,~_i]iuminating t~ngmecrtng Society)

~'-~.~,tv, The Coleman Company, Inc. J~re~'~Jr'Conditioning and Refrigeration ~ t u ~ )

W. J. S m i t h , Underwriters' Laboratories Inc.

M. W. s m i t h m a n , National Association of Home Builders

Harry A. S tuar t , Trailer Coach Association Rober t A. Tanner , Utah State Fire Marshal

~ ep. Fire Marshals Assoeiatmn of North meriea) C. P. Van Zandt , Sierra Craft (rep. Trailer

Coach Association) J o h n Wllford, New Jersey Dept. of En-

virenmental Protection J . He rbe r t Wlt te , Gas Vent Institute

A l t e rna t e s

A g Aspengren, Mobile Homes Manufae- "tu~e~ Association (Alternate to Charles ~de~)

Don Belton, Mobile Homes Manufacturers ~tssoeiation (Alternate to Aren Kliewer)

l~APh A. B l~.wster, American Insurance ~Deiation tAstemate to tJavid Curley)

philip Dykstra , National Safety Council (Alternate to Hans R. Grigo)

R.ffi George Early, National Conference of S~tes for Building Codes and Standards (Alternate to Kenneth C. Henke, Jr.)

Robert J: Evans, Air Conditioning ~ d Re- fTigeration insti tute (Alternate Jim Pr~ty)

Howard. L. Glaaky,__Traller Coach Associa- tion (Alternate to Harry A. Stuart)

H. Kent Glenn , Electric Light and Power Group (Alternate to William Earthman)

~CodUl H. Heils.tedt, Budding Officials and e Adminmtrators International (Alter-

hate to principal to be appointed by Coun- cil of American Building Officials)

John C. Hewi t t , State of Washington, Dept. of Labor and Industries (Alternate to William E. Dell)

F, E. Hodgdon, American Gas Association (Alternate to Verne R. Greendal)

T. A. Hook, National Association of Home Builders. (Alternate to M. W. Smithman)

Nicholas A. LaCourte , American SOciety of .Heating, Refrigerating and Air Condition-

,rag Engineers, Inc. (Alternate to Jordan Heiman)

Nell MacLean, International Assneiation of Plumbing and Mechanical Officials (Alter- nate to Norman Latter)

J . P. Markey, Electric Light and Power • Group (Alternate to William Earthman)

W. G. M a r t i n I i I , National Electrical Manufacturers Association (Alternate to L. E. Palmer)

W. D. Mil ler , National Electrical Manu- facturers Aesoeiation (Alternate to L. E. Palmer)

C h u c k Morton , Mobile Homes Manufne- turere Association (Alternate to Don Barrow)

J ~ / n Nakafl , Trailer Coach Aesoeiation (Alternate to C. P. Van Zandt)

J a m e s H. Pieler t , National Bureau of Standards (Alternate to James G. Grees)

K e n n e t h D. Rho ton , The CrMtmen'e Guild (Alternate to R. T. Arnold)

Rene H. Yerke, Underwriters' l.~boratories. Inc. (Alternate to W. J. Smith)

Michael Z ienmn, Trailer Coach Association (Alternate to Francis E. Greenleaf)

Nonvot ing Members .

Walter N. Burke , Veterans Administration Clarence E. Cuylar , Division of Community Management Systems, U.S. Dept. of Health,

Education and Welfare Dmme E. Kepl in~ar , Federal Housing Administration, U.S. Dept. of Housing & Urban De-

velopment Denis Temple , Canadian Standards Association Wflford L Summmm, National Fire Protection Association Georlae H. Tryon, National Fire Protection Association

808 ~OB~L E HO~r'ZS AND RECREATIONAL VEHICLES MH-9

Sectional Committee on Recreational Vehicles

Wal te r H. Johnson , Chairman, Vice President, Technological Services, National LP-Gas Association

79 West Monroe Street, Chicngo, IL 60603

Phi l ip N. Shrake , ~ecretary,t Standards Director, Recreational Vehicle Institute, Ine., 2720 Des Plaines Ave.

Des Plaines, IL 60018

LeRoy V. Abbot t , MarketDyne Interna- tional Incorporated

Deleran J. Arnold, Bendix Home Systems (rep. Recreational Vehicle Institute,

Russel l R. Bahr , California Dept. of Housing and Community Development

Har ry L. B a k e r , Oregon Department of Commerce

Artte O. Barker , Idaho State Electrical Boa~rd (rep. National Electrical Code Com- mittee; International Association of Else- trical Inspectors)

C. E. Blome, American Association of Re- tired Persons

Francis Bowsman, Fruit Belt Electrical Cooperative (rep. National Rural Electric Cooperative Association)

David Curley, Aetna Life and Casualty (rep. American Insurance Association)

Edward J. Dwyer, E. J. Dwyer Company (rep. American Society of MeehanicalEn- gineers)

William Earthman, Duke Powter Co. (rep. Electric Light and Power Group)

If. William Ewlg, Utica Mutual Insurance Company (rep. American Mutual Insur- ance Alliance)


Lloyd W. Garner, Georgia State Firemen's Association, Inc.

J o h n R. Gore, Jr . , Georgia State Fire Marshal (rep. Fire Marshals Association of North America)

Verne R. Groendal , Michigan Consolidated Gas Co. (rep. American Gas Assoctation)

J o h n H. Has t , National Park Service, U.S. Dept. of the Interior

Jo rdan H e i m a n , Intertherm, Inc. (rep. American Society of Heating, Refrigerating and Air Conditioning Engineers)

tNonvoting

Frederick F. Helsel, Minnesota State Dept. of Health (rep. Conference of State Sani. tary Engineers)

John D. Hosey, Foremost Insurance Corn. pany

R. E. KIInftler, Holiday Rambler Corp. (rep. Recreational Vehicle Institute) '

J o h n P. Langmead , Gas Appliance Manu. facturers Association

Norman Lat te r , International Associatioa, of Plumbing and Mechanical Officials

Samue l J. Morano, American Society ¢~ Sanitary Engineering

L. W. Moses, Trailer Coach Association Marvin Nerem, Winnebago Industries, I~.

(rep. Recreational Vehicle Institute) L. E. Palmer , Union Insulating Compa~

(rep. National Electrical Manufactursm Association)

Dr. M a r y S. Plckettt_Iowa State Univemlt~ (rep. Illuminating I~ngineering Society)

J i m Prln ty , The Coleman Company, In~, (rep. Air Condttioning and Refrigerati01 Institute)

Kenne th D. Rhoton, The Craftsmes'l Gudd

W. J. Smi th , Underwritem' Laborateriet Inc.

Har ry A. S tuar t , Trailer Coach Associati~ Rober t A. Tanner , Utah State Fire Mars~l

(rep. Fire Marshals Association of Nort~ America)

C. P. Van Zandt , Sierra Craft (rep. Traile Coach Association)

J o h n Wilford, New Jersey Dept. of Envlr0~ mental Protection

J. Herber t Wlt te , Gas Vent Institute

A l t e r n a t e s

T. R. Arnold, The Craftsmen's Guild (Alter- nato to Kenneth D. Rhoton)

Doug Betta , Trailer Coach Association (Alternate to L. W. Mo~q)

Ra lph A. Brewster , American Insurance Association (Alternate to David Curley)

Rober t J . Evans, Air Conditioning and Re- frigeration Institute (Alternate to Jim Printy)

Howard L. Glasky, Trailer Coach Associa- tion (Alternate to Harry A. Stuart)

H. Ken t Glenn, Electric Light and Pow~' Group (Alternate to William Earthman)

F. E. Hodgdon, American Gas Association (Alternate to Veme R. Groendsl)

Eugene L. Kilbourn, Recreational Vehide Institute (Alternate to Delevan J. Arnold)

Nicholas A. LaCourte, American Seeie~ of Heating, Refrigerating and Air Co~ ditioning ~nginsers, Inv. (Alternate to Jordan Heiman)

~ - -10 M O B I L E HOMES AND R E C R E A T I O N A L V E H I C L E S 809 lqeil MacLean, International Association of

plumbing and Mechanical Officials (Alter- ~ t e to Norman Latter)

j p Markey, Electric Light and Power • G~uP (Alternate to William Earthman)

W P" Marshal l , Recreational Vehicle In- Stitute (Alternate to Marvin Nerem)

W G. Mar t in , !11, National Electrical Manufacturers Association (Alternate to L. E. Palmer)

W. D. Miller , National Electrical Manu- facturers Association (Alternate to L. E. Palmer)

J i y u n NakaJi, Trailer Coach Association (Alternate to C. P. Van Zandt)

F. M. Radlgan , Recreational Vehicle In- stitute (Alternate to R. E. Klingier)

Rene H. Yerke, Underwriters' Laborntories, Inv. (Alternate to W. J. Smith)

Nonvoting Members.

Eobert Buechner , National Recreation & Park Association Oare~ce E. Cuyler , Die. of Community Management Systems, U.S. Dept. of Health, Edu-

cation and Welfare wilford | . S u m m e r s , National Fire Protection Association Denis Temple, Canadian Standards Association George H. Tryon, National Fire Protection A&qoeiation

Sectional Committee on Recreational Vehicle Parks

LeRoy V. Abbot t , Chairman, MarketDyne International Incorporated, No. 4 Penn Center Building

Philadelphia, PA 19103

Phi l ip N. Shrake , 8~cret~ry~ Standards Director, Recreational Vehicle Institute, Inc.

2720 Dee Plnines Avenue, Des Plaince, IL 60018

~Beardtie O. Barker , Idaho State Electrical (rep. National Electrical Code

Committee; International Association of Electrical Inspectors)

Lowry M. B e l l , J r . , Howard Johnson's Meter l~ lge s

C, E. Blame, American Association of Re- fired Persons

l~ande Boweman, Fruit Belt Electrical Cooperative (rep. National Rural Electric Cooperative Association)

David Curley, Aetna Life and Casualty (rep. American Insurance Association)

William E a r t h m a n , Duke Power Co. (rep. Electric Light and Power Group)

H. Will iam Ewlg, Utica Mutual Insurance Company (rep. American Mutual Insur- ance All~ee)


Lloyd W. Garner , Georgia s ta te Firemen's Association, Inc.

Howard Glasky, Trailer Coach Association John R. Gore, J r . , Georgia State Fire

Marshal (rep. Fire Marshals Association of North America)

V e!"ne R. Groendal , Michigan Consolidated Ga as Co. (rep. American Gas Assoeiatton)

Char les J . Har t , National Electrical Con- tractors Association

J o h n H. Hast , National Park Service, U.S. Dept. of the Interior

Jo rdan He lman , Intertherm, Ice. (rep. American Society of Heating, Refrigerating and Air Conditiomng Engineers)

Freder ick F. Heisel, Minnesota State Dept. of Health (rep. Conference of State Sani- tary Engineers)

J o h n D. Hosey, Foremost Insurance Come party

Wa l t e r H. Johnson , National LP-GUS As- soclatmn

E. J. Ki lbourn , Progressive Dynamics Inc. (rep. Recreational Vehicle Institute)

Wayne Kern, PRF Industries, Inv. (rep. Recreational Vehicle Institute)

Norman L a t t ~ , International Association of Plumbing and Mechm~ieal Officials

Samue l J . Morano. American Society of Sanitary Enginecdng

L. W. Moses, Trailer Coach Association Marvin Nerem, Winnebago Industries, Inc.

(rep. Recreational Vehicle Institute) K e n n e t h P. Rhoton . The Craftsmen's

Gudd Pau l L. Solomon, Cali/ornia Dept. of

Housing and Community Development

810 MOBILE HOMES AND RECREATIONAL VEHICLES MH-lt

Homer Staves, Kampgrotmds of America Harry A. Stuart , Trailer Coach Association Robert A. Tanner, Utah State Fire Marshal

(rep. Fire Marshals .A.ememtion of North America)

John w.uford, New Jersey Dept. ot Envttee. mentm t+mteetton

Rene H. Yerke, Underwriters' LaboratorieS1 Inc.

Alternates

T. R. Arnold, The Craftsmen's Guild (Alter- hate to Kenneth D. Photon)

Ralph k. Brewuter, American Insurance A~moeiation (Alternate to David Curley)

H. Kent Glenn, Electric Light and Power Group (Alternate to William Earthman)

F. E. Hodtdon, American Gas .A~ociation (Alternate to.Verne R. Greendal)

l~teholas A. LaCourte, American Society of

Heat~, Refr~erattng+.and Air Condltle~ ins ~ngineers, inc. CAlternate to Jord~ Heiman)

Nell MacLeant International^A~.~e. iatiou Plumbin~_ ~ mechani.'eat umeials (Alter. hate to Norman Latter)

W. P. Marshall, Reereattonal Vehicle I ~ tute (Alternate to Marvin Nerem)

W. J. Smith, Underwriters' Laboratori~ Inc. (Alternate to Rene H. Yerke)

NonvotinQ Membens

J~ F. Bryson, Manitoba Hydro (rep. Canadian Standards Association) Robert Buechner, NationJd Racreatlon & Park Association Clarence E. Cuyler, Div. of Community Management Systems, U.S. Dept. of Health, Ed~

eation and Welfare Wllford I. Summers, National Fire Protection Association Geo~e H. Tryon, National Fire Protection Aesoeiation

R E V I S I O N S T O N F P A N O . 501A 811

501A-1

Part IA

1974 Proposed Revision to the Standard for

Mobile Home Parks

Revision of NFPA No. 501A m 1 9 7 3 (Proposed ANSI A 1 7 7 . 1 ~ 1973)

I. par. 2.17 Revise to read:

~17 Mobile Home Lot. A designated parcel of land in a mobile home park designed for the accommodation of one mobile home, its accessory buildings or structures, and accessory equipment for the exclusive use of the occupants.

2. Par. 3.1. Substitute for the words "recommendations on" the words "provisions for" in the first sentence and delete the ward "suggested" in the second sentence since all the Subparagraphs in the Section now contain mandatory provisiorL¢ (see also Item 5) for new mobile home parks, the revised text to read:

5.1 General . The material in this Part contains provisions for new mobile home park design and land use where local regulations gov- erning such design and land use are not in effect. The criteria is intended to give minimum guidance which is considered good practice.

3. Par. 3.3. Revise to read:

5.3. Space Utilization. Lot coverage and building separation in a mobile home park for each mobile home and its accessory structures shall be in accordance with the following:

4. Par. 3.3.2. Revise by editorially substituting far the words "mobile homes" the words "a mobile home" to keep the language in the singular, the revised text to read:

3.3.2 A mobile home shall not be located closer than 10 feet from any other mobile home or permanent building within the mobile home park. Mobile home accessory building shall not be closer than 3 feet from a mobile home or building on an adjacent lot.

.5. Par. 3.6. Change "should" to "shall," the revised text to read:

3.6 Vehicle Parking. Mobile home parks shall be designed to include two automobile parking spaces for each mobile home lot.

812 501A-2 REVISIONS TO NFPA NO. 501A

6. Par. 4.7. Revise to read as follows (see also changes for Par. 7.1.5, 7.Z3.4, 8.4.2 (new) and 9.7.6 in Items ll , 14, 17, and 20), deleting the present "Note" and "Exception" but retaining present 4.1,1).

4.1 Utility Connections. Utility connections serving each mobile home shall be located as specified in Paragraphs 7.1.5 (water), 7.2.3.4 (sewer), 8.4.2 (electrical) and 9.1.6 (gas) to properly service the mobile home when placed on a mobile home stand.

Noa'R: See Figure 2, Appendix A.

7. Par. 5.11.2. Delete the present second sentence and change "should" to "shall" in the last sentence, the revised text to read:

5.11.2 Design and Construction. The design and construction of all structural elements of a porch, stairs leading thereto, and rails shall be in accordance with the applicable provisions of nationally recognized dwelling codes. Live loads applicable to porch floors shall be not less than 40 pounds per square foot.

8. Par. 6.3. Add to the end oaf the first sentence, the words "adopted by the authority having jurisdiction," the revised wording to read:

6.3 Fuel Gas Piping and Equipment Installations. Fuel gas piping and equipment installations installed within a permanent building in a mobile home park shall con~ply with nationally recog. nized appliance and fuel gas piping codes and standards adopted by the authority having jurisdiction. Where the state or other political subdivision does not assume jurisdiction, such fuel gas piping and equipment installations shall be designed and installed in accordance with the appropriate provisions of the Standard for the Installation of Gas Appliances and Gas Piping (NFPA No. 54-1969; A N S I Z21.30-1964); the Standard for the Installation of Gas Piping and Gas Equipment on Industrial Premises and Certain Other Premises (NFPA No. 54A-1969; ANSI Z83.1-1972); or the Standard for the Storage and Handling of Liquefied Petroleum Gases (NFPA No. 58-1972; ANSI Z106.1-1972).

9. Par. 6.4. Add to the end of the first sentence, the words "adopted by the authority having jurisdiction," the revised wording to read:

6.4 Oil-Burning Equipment and Installation. Oil-burning equipment and installations within a permanent building in a mobile home park shall comply with nationally recognized codes and standards adopted by the authority having jurisdiction. Where the state or other political subdivision does not assume jurisdiction, such oil-burning equipment and installation shall be designed and installed in accordance with the appropriate provisions of the

R E V I S I O N S T O N F P A N O . J 5 0 1 A 813

501A-3

Standard.for the Installation of Oil Burning Equipment (ArFPA No. 31- 1972; AArSI ~95.1-1972).

10. Par. 7.1.2.4. Add at the end of the present sentence the words "of the authority having jurisdiction," the revised paragraph to read:

7,1.2.4 The treatment of a private water supply shall be in accordance with applicable laws and regulations of the authority having jurisdiction.

11. Par. 7.1.5. Revise to read as follows, eliminating the "Except ion" (ste also Item 6):

7.1.5 Individual Water-Riser Pipes and Connections. Each ~obile home stand shall be provided with a water riser or risers located and arranged to permit a t tachment in a workmanlike tnanner to the mobile home utilizing the stand. The water supply connection shall be within 3 feet of a line located 40 feet from the front cross member of the mobile home and to the left of the centerline of the stand. (See Section 4.1.)

No're: See Figure 2, Appendix A.

12. New Par. 7.1.5.3. Insert the.following new Paragraph Z 1.5.3 re- nurabering existing Paragraphs Z 1 . 5 . 3 ~ ZL5 .5 accordingly with no thange in content:

7,1.5,3 When used, heat tapes shall be of the listed type.

13. Par. Z2.2. Revise to specify that the design for the minimum flow oaf sewage collection system be 200 gallons per day per mobile home lot in-

atad oaf 150 gallons, the revised text to read:

7,2,2 Sewage Collection Lines. All sewage collection lines shall be located in trenches of sufficient depth to be free o f breakage from traffic or other movements and shall be separated f rom the park water supply system at a safe distance. Sewage collection lines shall be at a grade which will insure a velocity of two feet per second when flowing full. The system shall be designed for a minimum fl0w of 200 gallons per day per mobile home lot.

14. Par. Z2.3.4. Revise to read asJollows, eliminating the "Except ion" (see also Item 6):

7.2.3.4 Provision shall be made for sealing the sewage collection inlet when a mobile home does not occupy the lot. Surface drainage Sail be diverted away from the inlet. The rim of the inlet shall ex- tend not more than 4 inches above ground elevation. The sewer drain inlet shall be within 3 feet of a line located 43 feet from the

814 501A--4 R~.VXSXONS TO NFPA NO. 501A ~

front cross member of the mobile home and to the left of the center, line of the stand. (See Section 4.1.)

75. Par. 9.1.3. l. Revise to read:

9.1.3,1 Gas piping shall not be installed underground beneath buildings, mobile home stands, mobile home accessory buildings or structures, or concrete slabs unless installed in an approved gas. tight conduit.

16. New Par. 9.1.5. Insert the following new Paragraph 9.7.5 (re. numbering present 9. 7.5 - - 9. 7.7 accordingly) :

9,1.5 Lot Shutoff Valve. Each mobile home lot shall have an ae. cessible, listed gas shutoff valve installed. Such valve shall not he located under a mobile home. Whenever the mobile home lot out. let is not in use, the shutoff valve shall be plugged to prevent ae. cidental discharge.

77. New Par. 9.1.6 (old 9.1.5). Revise by adding new material ( l~ sentence), eliminating the present "Note" (see also Item 6):

9.1.6 Connector. Each mobile home utilizing gas shall be con. nected to the mobile home lot outlet by a listed flexible mobile home connector, 6 feet in length, and of sufficient capacity to supply gas to the connected load. Approved rigid pipe and fittings shall be used between the flexible connector and the mobile .home lot gas outlet when the distance between the mobile home lot gas outlet and the mobile home gas service connection exceeds 6 feet The gas supply connection shall be within 3 feet of a line located 37 feet from the front cross member of the mobile home and within 9 feet to the left of the centerline of the stand, clearly outside the perimeter of the mobile home stand. (See also Sections 4.1 and 9.1.6.)

78. aVew Par. 10.1.7. Insert the following new text:

10.1.7 Hea t Tapes. As noted in 7.1.5.3, heat tapes shal ! be of the listed type.

79. Par. 70.Z L Delete the first two sentences as not beingpertinent to "mobile home parks" and revise the balance of the Paragraph to read (retaining present "Note") :

10.2.1 Detection Systems in Buildings Open to the PUblic, Fire detection and alarm systems installed in buildings opefi to the public shall be installed in accordance with the ArFPA Standard on Local Protective Signaling Systems (ArFPA aVo. 72A-1972).

R E V I S I O N S T O N F P A N O . 501A 815

501A-5

20. Par" ?O.Z2 Change the "shoulds" to "shalls" in both sentences and change the word "approved" in the second sentence to the word "required," tO revised text to read:

10.2.2 Public Fire Alarm Services. Street fire alarm services for the park, if provided, shall be in accordance with the .NFPA Standard for the Installation, Maintenance and Use of Public Fire Service Communications (aVFPA aVo. 73-1973). Where such services are not available, alarm procedures shall be posted in each mobile home ~d in each public building in the park as required by the local fire department.

21. Par. 10.3 Change the word "should" to "shall" in the second, third and fourth sentences.

22. Par. 10.4.1 Change the wo}d "should" to "shall" and insert the word "listed" before the words "portable fire extinguishers."

72. Par. 10.4.2 Change the words "an approved" to "a listed" in the f~st sentence, deleting the asterisk footnote.

~. Par. 10.5.? Change the word "should" to "shall" in the first stntence and insert a new second sentence to read as indicated below:

10.5.1 Introduction. The purpose of this section is to list fire safety rules and regulations which shall be conspicuously posted in areas by the mobile home park management. Park management shall prepare poster(s) containing the type material detailed in Section 10.5.2 as required by the fire department. The objectives are (1) to inform all those concerned to cooperate by complying with these rules which are deemed desirable for the protection of life and proper W from fire.

~. Par. ?0.5.7 Change the word "should" to "shall" and revise the last sentence to read as shown below:

10.5.7 Rubbish. Owners shall keep the area under and around their units free from an accumulation of rubbish (paper), leaves and brush. Containers have been provided for disposing of rubbish and a collection system maintained. Burning of rubbish, if per- mitred, shall be done only in approved incinerators.

~6. Appendix A Change the heading for Figure / herein flora "Weather Zone Map of U.S.A." to "Load Zone Map of U.S.A."

27. Add new "Figure 2. Diagram of Placement of Utility Connec- ~ons Serving Each Mobile Home." (see next page)

- f -

,q

Front of Mobile Home Stand

37 feet

Maximum Mobile Home Length Contemplated ' 70 feet Minimum Mobile Home Length Contemplated I~ I

35 feet I

< 40 feet

,.I

Water

43 feet ~ I

]Figure 2. ~]a~ra~m of ]Placement of U ~ t y Connectlons Servlng l~ch Mobile Home.

Electrical Feeder Assembly Sewer Collection Inlet

~oo

<

O

Z o

R E V I S I O N S T O N F P A N O . 5 0 1 A

817 501A-7

Part IB

Revise Part 8, Mobile Home Park Electrical Systems, to read as follows:

Par t 8. Mobi le H o m e P a r k Electrical Systems

8.1 App lication a n d Scope. This Part applies to electrical distribution systems in mobile home parks. I t does not apply to the electrical systems of mobde hgmes or the feeder assembly used to connect them to the mobile home service equipment. Except as otherwise permitted .or .required by this Standard, all electrical installations tn mobile home parks shall be designed and con- otructed in accordance with the applicable provisions of the Na- tional Electrical Code (NFPA No. 70 - - 1974; ANSI CI - - 1974).

8.2 Distr ibution System. The mobile home park secondary electrical distribution system to mobile home lot service equipment shall be single phase 115/230 volts nominal. Where the park service exceeds 240 volts, transformers and secondary distribution panel- boards shall be treated as services.

8.3 Calculated Load

8.3.1 Park electrical wiring systems shall be calculated on the basis of not less than 16,000 watts (at 115/230 volts) per each mobile home service. The demand factors which are set forth in Table 1 are the minimum allowable demand factors which may be used in calculating load on feeders and service. No demand factor shall be allowed for any other load, except as provided herein.

Table 1"

Demand Factors for Feeders and Service Entrance Conductors

Number of Mobile Homes Demand ]'actor (Percent) 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4

4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5 . . . . . - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3

6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 7-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 10-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 13--15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 16-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 22-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 41--60... ~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 61 and over . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

818 501A-8 REVISIONS TO NFPA NO. 501A

8.3.2 The demand factor for a given number of lots shall apply to all lots indicated.

For example: 20 lots calculated at 25 percent of 16,000 watts results in a ~00rmissible demand of 4,000 watts per lot or a total of 80,000 watts for

lots.

8.3.3 Mobile home lot feeder circuit conductors shall have adequate capacity for the loads supplied, and shall be rated at not less than 100 amperes at 115/230 volts.

8.4 Mobile Home Service Equipment

8.4.1 Mobile home service equipment shall be rated a t n o t less than 100 amperes, and provisions shall be made for connecting a mobile home feeder assembly by a permanent wiring method. Power outlets used as mobile home service equipment shall als0 be permitted to contain receptacles rated up to 50 amperes with appropriate overcurrent protection. Fifty-ampere receptacles shall conform to Figure 8.4.1.

Re cop foc le Cop

@ @ 125 J ~50-vOlt, 5~-omp, 3~oole , 4-witch ~rounding type

Fisu.rc 8.4.1

NoT~: Complete details on the 50-ampere attachment plug cap configura- tion can be found in American National Standard C73.17 - - 1972.

8.4.2 For cord connected mobile homes, the point of connecting the feeder assembly to the mobile home shall be located not le~ than 45 feet or more than 65 feet from the front of the mobile ho~ ~ stand and outside of the mobile home stand not more than 2 feet from the left line of the stand.

NoT~: 50 feet represents the optimum location for stands designed for mobile homes 50 feet to 70 feet m length.

8.4.3 Mobile home service equipment shall also be provid~ with a means for connecting a mobile home accessory building 0~ structure or additional'electrical equipment located outside a nl0" bile home by a permanent wiring method.

,REVISIONS TO NFPA NO. 501A 819

501A-9

8.4.4 Additional receptacles may be provided for connection of electrical equipment located outside the mobile home; and all such 120-voh, single-phase, 15- and 20-ampere receptacles shall be protected by approved ground-fault circuit protection for per- sonnel.

No'rR: See Article 210-22(d) of the National Electrical C, ode (NFPA No. 70 - - 1974; ANSI Cl - - 1974).

8.4.5 Electrical ~quipment installed in a mobile home accessory building or structure shall comply with the applicable provisions of the National Electrical Code (NFPA No. 70 - - 1 9 7 4 ; ANSI Cl - - 1974).

820 REVISIONS TO NFPA NO. 501B S 0 I B ~

Part II A

1974 Proposed Revisions to the Standard for

Mobile Homes

N F P A No. 5 0 1 B - 1973

ANSI A l 1 9 . 1 - - 1 9 7 4

Part A - - General

1. Chapter 2. Definitions Common to All Parts. Insert the definitions q the words "Labeled" and "Listed" (as approved by ArFPA) in this Chapter. Delete the definitions of "Labeled" from Part C, Chapter 4 and Part E, Chapter 3. Delete the definitions of "Listed'from Part B, Chap. ter d; Part C, Chapter d; Part D, Chapter 3; and Part E , Chapter 3. (See Items d, 33, 68, and 105 herein.)

Part B - - Body and Frame Design and Construction Requirements

2. Par. 4. 1. Revise to read:

4.1. Accepted Engineering Practices. Paragraph 2.1 explains the scope of this Part and Chapter 5 sets forth the General Re. quirements. The Appendix to this Part provides a Reference Table to Accepted Engineering Practices which is not a part 0f this Standard but is included for information purposes.

3. New Par. 4.3 (redesignating successive Paragraphs in Chapter 4 at. cording&). Insert the following new definition:

4.3. Gross Floor Area. To calculate the gross floor area of any room under the provisions of this Standard, all space, wall to w ~ shall be counted, including recess entries and areas under built-in vanities and similar furniture. Where ceiling height is less than that specified in 8.2 of this Part, the floor area under such ceilings shall not be included.

d. Par. 4. 7 Move this definition of the word "Listed" to Part A, Chap. ter 2. (See Item 7.)

821 ~ I B - 2 REVISIONS TO NFPA NO. 5 0 1 B ;. Par. 4.10. Delete the definition of "Single Station Alarm Device." See Item 27.)

'i. Par. 4. 11. Delete the definition of "Sleeping Area" since it is no ~nger used in the text. (See Item 27.)

• Par. 4.12. Delete this definition of"Smoke Detector." (See Item 27. )

;. Par. 5.3. As an editorial matter, add the parenthetical phrase: "(See ?aragraphs 5.10 and 6.11.)"

~. Par. 5.5. Make editorial correction substituting "6.4" for "6A" in !e third line.

'0. Par. 5. 7. Revise to read:

~7. Acceptabil i ty of Materials. The Appendix to this Part lists group of Accepted Engineering Practice Standards which may

~c referred to for guidance. Deviations from the applicable portions ,f these Standards shall be permitted when they meet the per- :mnance requirements specified herein.

II. Pars. 6..3., 6.3.1, 6.3.2 and 6.4: Revise to read:

~3. Wind and Snow Loads.

6.3.1 Standard Wind. When a mobile home is not designated • Hurricane- and Windstorm-Resistive," the mobile home shall be :esigned for the following wind loads:

Horizontal . . . . . . . . . . . . . . . . . . 15 lb/ft ~ (1 day load duration) Vertical Upward . . . . . . . . . . . . 9 lb/ft ~ (1 day load duration) Vertical Downward . . . . . . . . . . . . . . . . . . (See 6.4, Roof Loads)

6.3.2 H u r r i c a n e Wind. When a mobile home is designated 'Hurricane- and Windstorm-Resistive," the mobile home shall be ~esigned for the following wind loads:

Horizontal . . . . . . . . . . . . . . . . . . 251b/ft ~ (1 day load duration) Vertical Upward . . . . . . . . . . . . 15 lb/ft ~ (1 day load duration) Vertical Downward . . . . . . . . . . . . . . . . . . (See 6.4, Roof Loads)

£4. Roof Loads. Flat, curved and pitched roofs shall be designed resist the following live loads, applied downward on the hori-

zontal projection :

822 REVISIONS TO NFPA NO. 5 0 1 B $01B~

Nor th Zone . . . . 30 lb / f t ~ (2 months load duration) Middle Zone . . . . 20 lb / f t ~ (7 days load dura t ion Hurr icane Zone 30 l b / f ¢ (1 day load durat ion)

NOTE: When engineering calculations are performed, allowable unit s t re~ may be increased as provided in the documents referenced in the Appendi~ Table to Accepted Engineering Practice Standard consistent with the load durations specified in Paragraphs 6.3 and 6.4 of this Part.

12. Par. 6.5. Change the reference on the fifih line fiom "6 .3 .1" to "6.3.',

1,3. Par. 6.5.1 (Arew Notes) Add to this Paragraph the following t~ New "Notes":

NOTE No. I. The provisions of Paragraphs 6.5.1.1, 6.5.1.2 and 6.5.1.3 of this Section shall be followed except when the tiedown system is designed by a Registered Professional Engineer or Architect.

No'rz No. 2. The manufacturer is only required to make provision for the connection(s) of tiedown hardware equipment but is not required to provide such equipment.

14. Par. 6.5.1.4. Change the "Note" after this Paragraph to read:

No'rE: Type 1, Class B, Grade 1, steel strapping 1 ~ inches wide and 0.035 inch thick, conforming with Federal Specification QQ-S-781-F, is judged to conform with Paragraphs 6.5.1.1 and 6.5.1.4 of this Part.


6.7 I n t e r i o r Wails, Inter ior walls shall be constructed with strue. rural capaci ty adequate for the intended purpose a nd shall be ca. pable of resisting a horizontal load of not less than five pounds per square foot.


6.9. Floors. (a) Floor assemblies shall be designed in accordance with ac.

cepted engineering practice s tandards to support a m i n i m u m uniform live load of 40 lb / f t ~ plus the dead load of the materials. I n addi t ion (but not simultaneously), floors shall be able to support a 200-pound concentra ted load on a two-inch diameter disc at the most critical location with a m a x i m u m deflection not to exceed one-eighth inch relative to floor framing. Perimeter joists of more than six inches depth shall be stabilized against over turning from superimposed loads as follows: at ends by solid blocking not less than two-inch thickness by full depth of joist, or by connecting to a cont inuous header not less than two-inch thickness and not

~01B-4 REVISIONS TO NFPA NO. 501B 823

leSS than the depth of the joist with connecting device; at eight- feet maximum internaediate spacing by solid blocking or by Wood cross-bridging of not less than one inch by three inches, metal cross-bridging of equal strength, or by other approved methods.

(b) Wood floors or subfloors ila kitchens, bathrooms (including toilet compartments), laundry rooms, water heater compartments, and any other areas subject to excessive moisture shall be moisture resistant or shall be made moisture resistant by sealing or by an overlay of nonabsorbent material applied with water-resistant adhesive.

(c) Carpeting shall not be uged under a heat-producing appliance unless the appliance is listed for such use.

IZ Par. 6.10. Revise to read:

6.10 Design Load Deflection. When a structural assembly is subjected to total design live loads, the deflection for structural framing members shall not exceed the following:

Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . L/240 Roof and Ceiling . . . . . . . . . . . . L/180 (See Appendix, Part B) Headers, Beams, Girders . . . . . . . L/180 (Vertical Loads Only)

Where L = the clear span between supports or two times the length of a cantilever.

18. Par. 6.1 L Revise to read:

6.11 Structural Load Tests. Structural assemblies or subassemblies tested for qualification shall sustain the design dead load (see 6.1) plus the superimposed design live loads (see 6.2) equal to 1.75 times the required live loads for a period of 12 hours without failure, unless otherwise specified herein (see 6.5.1.1). Failure shall be considered rupture, fracture or residual deflection which is greater than the limits set in 6.10 of this Part. An assembly or subassembly to be tested shall be representative of the minimum quality of materials of the group of assemblies or subassemblies as ordinarily manufactured. Each test assembly, component or subassembly shall be identified as to type and quality or grade of material. Structural load tests or other tests based on nationally recognized standards may be approved.


7.3 Interior Walls, Partitions, and Ceilinfs. The interior finish

824 ., v,s,oNs TO NFPA NO. 501B 501B-8 of habitable rooms and hallways (excluding molding, doors, trim, cabinets and splash panels), enclosures for furnaces and water heaters (including doors) shall be of materials whose flame spread classification shall not exceed 200 when tested by the Standard Method of Test for Surface Burning Characteristics of BUilding Materials (ANSI A2.5-1970; A S T M E84-70; UL723-1971; NFP~, No. 255-1972). A door or doors serving a closet with an opening exceeding 21 square feet shall comply with this requirement.

20. Par. 7.5.4 (Certificate only). Change the fourth, fifth and sixth lines of the Certificate to read: The living area of this home is designed to maintain comfort heating where the outdoor temperatures are not lower than __F when the home is equipped with storm windows and not lower than __F when the home is not equipped with storm windows.

21. Par. 7.6. Move to Part E of the Standard. (See Item 105.)

2Z Par. 8. 7.1. Add the word "gross" before the words "floor area~' in both the third and fourth lines.

23. Par. 8.3.1.(c) Add the foUowing new sentence to the existing text:

Where a screen or storm window is required to be removed from this window to permit emergency egress, it shall be readily re. movable without requiring the use of tools.

24. Par. 8.3.3. Revise to read:

8.3,3 In te r io r Passage. Interior doors having passage hardware without a privacy lock, or" with a privacy lock not engaged, shall open from either side by a single movement of the hardware mechanism in any direction.


8.5.1 Windows. All windows shall meet the requirements for windows as detailed in the Window Specifications for Utilization in Mobile and Factory Built Housing, ( M H M A Spec. No. 1-71- Rev. 1973).

26. Par. 8.5.1.1 (New 8.5.2). Renumber as 8.5.2 and rewordas shoum below with old Table B-2 changed in number to B-I and revised as shown herein:

s0tB-0 REVISIONS TO NFPA NO. 501B 825

8.5.2 G l a z i n g in h a z a r d o u s loca t ions shal l c o m p l y w i t h T a b l e

13-1. TABLE B-1

Glazing in the Following Specific Hazardous Locations Shall Meet the Following Requirements

Size of Specific Hazardous Individual

Locations Glazed A r e a Requirements 2

Glazing in exit a n d entrance Over 6 sq. ft. doors

Glazing in storm doors Over 2 sq. ft.

Glazing in sliding exterior All Sizes doors

Glazing in all unframed doors (swinging)

All Sizes

Glazing in shower doors and All Sizes tab enclosures

Other fixed glazed panels located within 12 inches on either side of exit and entrance doors

All Sizes

Each glazed area shall pass the requirements of ANSI Standard Z97.1 - - 1972 if not protected by a protective grillO firmly attached to stiles on each exposed side.

Each glazed area shall pass the requirements of ANSI Standard Z97.1 - -1972 if not protected by a protective grille I firmly attached to stiles on each exposed side.

Each glazed area shall pass the requirements of ANSI Standard Z97.1 - - 1972.

Each glazed area shall be fully tempered glass and pass the requirements of ANSI Standard Z97.1 - - 1972.

Each glazed area shall pass the test requirements of ANSI Standard Z97.1 - - 1972.

Each glazed area shall pass the requirements of ANSI Standard Z97.1 - - 1972 if not protected by a barrier within 12 inches immediately in front of the glazing, not less than 18 inches in height measured from the floor.

tShall be constructed and attached in such a manner so as to prevent human impact from being delivered to glass surface.

~Annealed glass less than single strength (SS) in thickness shall not be used. If short dimension is larger than 24 inches, annealed glass must be double strength (DS) or thicker.

27. Sec. 9. Revise to read:

9. Mobile Home Fire Warning Equipment

9.1 G e n e r a l . A t least one l is ted s m o k e d e t e c t o r ( w h i c h m a y be

8 2 6 REVISIONS TO NFPA NO. 501B 501B-7

a single station alarm device) shall be installed in each mobile home.

NOTe: A "smoke detector" is a device which detects visible or invisible particles of combustion. A single station alarm device is an assembly in* corporating a detector and an alarm sounding device in one unit, operated from a power supply either in the unit or obtained at the point of installa. tion.

Detectors shall operate from an AC, monitored battery, or corn. bination A C / b a t t e r y power source.

9.2 Smoke Detector Locat ion . Smoke detector(s) shall be 10. cared outside of bedrooms, in a hal lway or space communicatinyt thereto, on or near the ceiling, and shall be installed in accordane~ with the manufacturer ' s instructions. Mobile homes having bed. rooms separated by any one or combina t ion of c o m m o n use areas, such as a kitchen, dining room, living room, or family room (but not a ba th room or utility room) shall have at least two detectors.

9.3 Alarm Sounding Device . Every smoke-detecting device shall cause the operat ion of an a la rm signaling device or devices which shall be clearly audible in all bedrooms with all intervening doors closed.

9.3.1 All a la rm sounding devices shall be rated not less than 85 decibels at 10 feet.

9.4 Detector Trouble Signals. Detectors requiring a light sourer for operat ion shall have an audible trouble signal on failure of thl light source, but such failure shall not cause an alarm. Detector not requiring a light source for operat ion shall have either a visibl~ light to indicate operabili ty or an audible trouble signal. Audibl, trouble signals shall be designed to operate at least every minut, for seven consecutive days.

9.5 Tes t ing . The mobile home manufac turer shall provide in structions (supplied by the device manufacturer) for the periodi testing of the detector(s).

28. Appendix to Part B; Old Table B-1.. Delete the Table Number r~ vising the heading to read:

Reference Table to Accepted Engineering Practice Standards for Part B of this Standard

This Reference Table is not a part of this Standard but is included for information purposes.

REVISIONS TO NFPA NO. 5 0 1 B 827.

20. Reference Table to Accepted Engineering Practice Standards (see Item 28). Add to and update this Table as indicated below (checking the ft]erentes again prior to final publication):

a. The reference to AITC-200 should be to the 1973 edition instead of tl~ 1963 edition.

b. The reference to U S D C CS 253-63 should be changed to U S D pS 56-73.

c. The most recent edition of the Nat iona l Design Specifications for Sdtress Grade L u m b e r and its Fastenings is 1973 with a Supplement is-

April 1973 (the present Table shows 1971).

d. The latest edition oaf the Standa rd for Working Stresses for JoiSts and Rafters is 1971 with a Supplement issued December 1972 (tl~ present Table shows 1970).

e. The latest edition of the Standa rd for Part icleboard for Mobi le ~Iome Decking is AtPA 1-73 (present Table shows 1971).

. A d d to the section on Fire Safety the following reference: Standa rd f0 the Instal la t ion, M a i n t e n a n c e and Use of Household Fire Warning E q u i p m e n t (NFPA No. 74-1972).

Tgble The latest edition of M H M A Spec. No. 1-71 is 1973. (present shows 1972).

30. Appendix to Part B; Test Procedure for Roof Rafters or Roof Trusses. Revise the first three items under "Tes t Procedures" to read:

1. Ap.~ly load units to the sheathing to equal the full dead load of roof and ceiling.

2. Noting the drawing (B-I), measure and record initial elevation of rafter or truss in test position at dead load.

3. Maintaining the dead load, add live load in 10 lb/ft 2 increments at 10- minute intervals. Continue until design load is reached and maintain load for 10 minutes. The maximum deflection due to design live load (elevation measured in Step 3 minus Step 2) shall not exceed L/180, when L is the clear span measured in the same units. Duration of load factors for wind or snow loading have been considered in establishing this test method. The test loads used shall be for the appropriate zone, as specified in Sec- tion 6.4 of this Part. No reduction shallbe made in the test loads for snow and wind conditions.

31. Add a new Appendix to Part B to read as follows:

W o o d Product Ba s e d Wall S u r f a c i n g for T u b a n d S h o w e r E n c l o s u r e s

L Material: The wall covering material must have an exposed surface that is impervious to water; the substrate

828 REVXSXOt~S TO SVPA SO. 5018 5 0 1 B ~

A. Strength:

B. Surface Finish:

C. Size:

D. Type :

11. Installation:

A. Framing:

B. Fastening:

material must be resistant to deterioration fro~ ~ exposure to high humidity and temporary water leakage.

The complete wail assembly, including the wal/ covering substrate, shall be capable of withstandi~ a uniform load of five pounds per square f0Q~ applied perpendicular to the surface. The de: " flection, under load, shall not exceed L/180 of the height of the wail, for the assembly; or L/240 the distance between framing members, for the Wall covering substrate.

The exposed surface must meet the minimum re. quirements of the American Hardboard Ass~-.ia. tion Industry Standard (I.S. 1-70) Sections 3.4.! and 3.4.2 Surface Finish Tests for Deeorativ¢ ' Finished Interior Wall Paneling: Class 1 as certi. fled by the panel manufacturer.

The minimum thickness of the material shall he 1~,, nominal. The width to be sul~cient to gi~ continuous unbroken surface from corner to corn~ or end of tub in corner installation. In an install~ tion incorporating a shower, the unbroken surf~ must continue to a height of at least 6 t above floor of the shower.

The substrate material shall also meet the requir~ ments of the appropriate standard listed below: (1) Hardboard: of h igh strength and water ft.

sistance to meet uommerciai Standard (~ 251-63, Federal Specification LLL-B-810a ~: AHA I.S. 1-70 either Standard or Temper~

(2) Softwood Plywood: must meet U.S. Produtt Standard P.S. 1-66 including exterior tyg glue line and Grade A face veneer "suital~! for painting."

(3) Hardwood Plywood: must meet P.$. 51-71 Type I glue line and sound grade face vene~

(4) Other Materials: not meeting the D-l, D-2 D-3 above, shall meet the requirements of Standard and their appropriate Prods;: Standard, Industry Standard, Commerd~ Standard or Federal Specification.

The material must be installed in conformance with this Standard and the application iustructi~ provided by the material manufacturer. In ca~ of conflict, this Appendix shall take precedence.

Wood framing shall be spaced not more than 16"0~ Blocking shall be 1 " x 3" or equal, installed h~ zontaily at height to match rim of tub or shower l~' All comers shall have sufficient framing member. for a t tachment of corner mouldings.

All edges and ends of panel shall occur on framig members. Panels shal lbe applied to wood frami~:'

solB-10 REVISIONS TO NFPA NO. fi01B 829

C. Corners a n d Edges:

members using water resistant, non=hard setting adhesive. Adhesive shall be applied to the face of all framing members except locations where panel edges fall beneath applied mouldings. Paneh may also be applied over solid backing using an adhesive. N O T E : Fasteners, if necessary, shall be used only in locations where they will be covered by applied mouldings and shall be used on not more than two adjacent edges. No other interior fasteners, or fixtures, other than required functional plumbing fixtures shall penetrate the face of the panel. Openings for these plumbing fixtures must be sealed with caulk.

All corners and edges must be caulked or sealed against moisture penetration. A non-hard setting sealant material must be used with applied mouldings. Fastening of mouldings to framing shall not be greater than 6 " o.c.

32. Figure B-2. Revise the title on the map to "Load Zone Map of U.S.A." instead of "Weather Zone Map of U.S.A."

Part C R Plumbing Systems

33. Part d Definitions. Revise or inc'lnde the following new definitions and move the definitions of Labeled and Listed to Part A (see Item 7).

Anti-Siphon T r a p Vent Device. A device which automatically opens to admit air to a fixture drain above the connection of the trap arm so as to prevent siphonage, and closes tightly when the pressure within the drainage system is equal to or greater than at- mospheric pressure so as to prevent the escape of gases from the drainage system into the mobile home.

Diameter. Unless otherwise specifically stated, is the nominal (inside) diameter designated commercially.

Grade. The fall (slope) of a pipe in reference to a horizontal plane expressed in inches per foot length.

Individual Vent . A pipe or anti-siphon trap vent device installed to vent a fixture drain.

Main Vent. The principal artery of the venting system to which vent branches may be connected.

Pitch. (See Grade.)

Primary Vent . (See Main Vent)

Secondary Vent . Any vent other than the main vent or those serving each toilet.

8 3 0 REVISIONS TO NFPA NO. 501B 501B-,II

Vent Caps. A device or fitting which protects the vent pipe from foreign substance with an opening t ° the atmosphere equal to the area of the. vent it serves.

34. Par. 8.1.9.1. Editorial. In the last line change the word "invert', to the word "weir".

35. Par. 8.1.9.3. Revise to read:

8.1.9.3 Concealed T raps . Traps with mechanical joints shall he accessible for repair and inspection.

36. Par. 8.1.9. 4. Revise to read:

8.1.9.4 Removabi l i ty of Traps , Etc. Traps shall be designed and installed so the " U " bend is removable without removing the strainers from the fixture. Continuous waste and tail pieces which are permanently attached to the " U " bend shall also be removable without removing the strainer from the fixture.


9.2.1.5 Floor Connection. Toilets shall be securely bolted to an approved flange or other approved fitting which is secured to the floor by means of corrosion-resistant plated screws. The bolts shall bc of solid brass or other corrosion-resistant material and shall bc not less than I/~ inch in diameter. A watertight seal shall bc made between the toilet and flange or other approved fitting by use of a gasket or sealing compound. (See also Paragraph 6.9(b) of Pa r t B)

38. Par. 9.2.2. Change the title of the Paragraph fiom "Shower Stalls" to "Shower Compartments."

39. Par. 9. 2. 2.1. Revise to read:

9.2~2;1 Each compartment stall shall be provided with an approved watertight receptor with sides and back extending 1 inch above the finished dam or threshold. In no case shall the depth of a shower receptor be less than 2 inches or more than 9 inches measured from the top of the finished dam or threshold to the top of the drain. The wall area shall be constructed of smooth, non- corrosive, and nonabsorbent waterproof materials to a height not

50~1B-12 REVISIONS TO NFPA NO. 501B 831

less than 6 feet above the compartment floor level. Such walls shall form a watertight joint with each other and with the receptor or shower floor. The floor of the compartment shall slope uniformly to the drain at not less than one-fourth nor more than one-half inch per foot. (See also Appendix to Part B.)

40. Par. 9.2.Z2. Revise to read:

9.2.2.2 The joint around the drain connection shall be made watertight by a flange, clamping ring, or other approved listed means.

41. Par" 9 .ZZ4. Revise to read:

9,2.2.4 Prefabricated plumbing fixtures shall be approved or listed and shall comply with all, applicable requirements relating to such fixtures.


11.2.1 Water Connection. Each mobile home with a water distribution System shall be equipped with a 3/~-inch threaded inlet connection located within the rear haft of the length of the mobile home. This connection shall be tagged or marked "Fresh Water Connection" (or "Fresh Water Fill"). A matching cap or plug shall be provided to seal the water inlet when it is not in use, and shall be permanently attached to the mobile home or water supply piping.

43. New Par. 11.2.1.1. Insert new text to read:

11.2.1.1 When a mobile home includes expandable rooms or is composed of two or more units, fittings or connectors designed for such purpose shall be provided to connect any water piping. When not connected, the water piping shall be protected by means of matching caps or plugs.


11.3.1.2 Any temperature relief valve or combined pressure and temperature relief valve installed for this purpose shall have the temperature sensing element immersed in the hottest water within the upper 6 inches of the tank. I t shall be set to start relieving at a pressure of 125 psi or the rated working pressure of the tank which- ever is lower and at or below a water temperature of 210°F.


832 REVISIONS TO NFPA NO. 501B 501B-13 11.5.1.3 Relief valves shall be provided with full-sized drain8

which shall be directed downward and discharge beneath the too. bile home. Dra in lines shall be of a material listed for h o t water distribution and shall drain fully by gravity, shall not be trapped, and shall not have their outlets threaded.

46. Par. 11.3.2 and 11.3.2.1. Delete in entirety as this subject is coo. ered under the referenced Standards for water heaters listed in the Table of Standards .for Plumbing System Components in the Appendix to Part C.

47. Par. I 1.4.2. Revise to read:

11.4.2 Fit t ings. Appropriate fittings shall be used for all changes in size and where pipes are joined. T he material and design of fittings shall conform to the type of piping used.

48. Par. 11.6.1 Table C3. Editorially renumber Tableto be C-1 (cot. retting reference in the second line of the Paragraph and in the Table heading) and revise table headings and "Notes" editorially to read:

TABLE C-1 M i n i m u m Size T u b i n g and Pipe for W a t e r Dis t r ibu t ion System,

Pipe Tubing (Nominal) Iron Pipe

Number of Dia. Outer DIZ. Size Fixtures (Inches) (Inches) (Inches)

1 ¼" ~ ~4 2 ~ ~

4 ~A % 5 or more ~ 7/~ ~4

*6 feet maximum length.

Exceptions to Table: ~ inch nominal diameter or ~ inch OD minimum size for clothes washing or dishwashing machines, unless larger size is recom- mended by the fixture manufacturer.

~,~ inch nominal diameter or s/~ inch OD minimum size for flushometer or metering type valves unless otherwise specified in their listing.

No galvanized screw piping shall be less than ~ inch iron pipe size.


11.6.2.2 A water heater, food waste disposal unit, evaporative cooler or ice maker shall not be counted as a water-using fixture when comput ing pipe sizes.

501B-14 REVISIONS TO NFPA NO. 501B 833

50. Par. 12.2. 1. Revise to read:

12.2.1 Loca t ion of D r a i n . Each mobile home shall have only one d ra in outlet which shall t e rmina te in the rear half section.

51. Par. 12.Z2. Revise to read:

12.2.2 C l e a r a n c e f rom D r a i n Out l e t . T h e d ra in outlet shall be provided with a m i n i m u m clearance of 3 inches in any d i rec t ion from all par ts of the s t ructure or appur t enances and with not less than 18 inches unres t r ic ted c learance d i rec t ly in front of the d r a i n outlet.

52. Par. 12.Z3, 12.Z3.1, IZ2.3.2, 12.2.3.3. Revise by deletingpart, renumbering, and revising into 12.2.3 and 1ZZ 4 as Jollows:

12.2.3 D r a i n C o n n e c t o r . T h e d ra in connec tor shall not be smaller t han the p ip ing to which it is connec ted and shall be equ ipped with a wa te r t igh t cap or plug ma tch ing the d ra in outlet . The cap or plug shall be pe rmanen t ly a t t ached to the mobi le home or d ra in outlet .

12.2.4 T h e d ra in o u d e t and d ra in connec tor shall not be l e s s than 3 inches inside d iamete r .

53. Par. 12.Z4. Renumber to be 12.2.5.

54. Par. 12.4. 7. Revise to read:

12.4.1 F i x t u r e L o a d . Excep t as p rov ided by Pa rag raphs 13.4.2, d ra in p ipe sizes shall be de t e rmined by the type of fixture and the total n u m b e r connec ted to each dra in .

55. Par. 12. 7 Revise by adding an exception at the beginning oJ the text to read: " E x c e p t for f ixture connect ions on the inlet side of the trap, . . ." with the rest oJ the text remaining the same.

56. Par. 13.3. l(c) Revise to read:

(c) T w o or more vented dra ins when at least one is wet-vented, or 2- inch d i a m e t e r (min imum) , and each d ra in is separa te ly connected to the main dra in .


13.3.2 I n d i v i d u a l Ven t s . Unless pro tec ted wi th an ant i - s iphon t rap vent device, each ind iv idua l ly vented fixture wi th a 11/~ inch

834 REVISIONS TO N F P A NO. 501B 501B-~

or smaller trap shall be provided with a vent pipe equivalent in area to a 11/~-inch nominal pipe size. The main vent, toilet vent and relief vent, and the continuous vent of wet-vented systen~ shall have an area equivalent to 1 ~ - i n c h nominal pipe size.

5& Par. 13.3.5. (Table C-2). Add the word " M a x i m u m " to the heading ojf Table C-2, the heading to read: " M a x i m u m Distance of Fixture T r a p from Vent ."

59. New Par. 13.4, 13.4.1, 13.4.2, and 13.4.3. Insert the following nan material renumbering existing Paragraphs as shown in Item 60:

13.4 Anti-Siphon Trap Vent.

13.4.1 Anti-Siphon Trap Vent Devices. Where an anti-siphon trap vent device is used as a secondary vent, it must be installed in accordance with the terms of its listing and shall be accessible. The lowest point of the valve seal when in the normally closed position shall not be less than 6 inches above the fixture tee. The toilet must be vented in accordance with Paragraph 13.3.1. Only anti-siphon trap vent devices which have been approved shall be installed.

13.4.2 Not more than two fixtures individually protected by anti-siphon trap vent devices shall be drained by a common 1 inch drain.

13.4.3 Three or more fixtures individually protected by anti. siphon trap vent devices shall be drained by a common 2-inch drain.

60. Old Pars. 13.4, 13.4.1, 13.4.2, 13.5, 13.5.1, 13.5.2 and 13.5.3. Renumber respectively as 13.5, 13.5.1, 13.5.2, 13.6, 13.6.1, 13.6.2and 13.6.3.

61. New Par. 13.0 (Old 13.5.3). Revise to read:

13.6 Vent Caps. Vent caps, if provided, shall be of the removable type (without removing the flashing from the roof) where ' required to perform the tests under / Paragraph 14.2.1 and 14.2.2 or when the vent is used as a clean out.

6Z Par. 14. I Revise to read:

14.1 Water System. All water piping in the water distribution system shall be subjected to a pressure test. The test shall be made by subjecting the system to air or water at 100 psi for 15 minutes without loss of pressure.

63. Table C-1. Delete Table Number and change the heading to read:

5001B-16 REVISIONS TO NFPA NO. 5 0 1 B 835

APPENDIX TO PART C Reference Table for Standards on Plumbing System Components

This Reference Table is not a part of this Standard but is in- dnded for information purposes.

64. Reference Table for Standards on Plumbing System Compo'nents (see Item 63). Add to, delete fiom, and update as indicated herein and check the referenced documents again just prior to final publication.

a. Under "Ferrous Pipe and Fittings" insert the following:

Cast-Iron Soil Piping ANSI Al12.5.1--1971 ; A S T M A74-72 and Fittings FS WW-P-401D - - 1969

b. Under "Plastic Pipe and Fittings" delete the Specifications f i r ABS Plastic Pipe (SDR-PR and Class T); Polyethylene (PE) Plastic Pipe (SDR-PR); and Polyvinyl Chloride (PVC) Plastic Pipe (SDR-PR and Class 7"). Add a reference/or Polybutylene (PB) Plastic Pipe (SDR-PR), ASTM D2662.

c. Under "Miscellaneous" add the Jollowing:

Anti-Siphon Trap Vent NSF-24 Device ~ 1972

and make the word "Gasket" plural in the reference to A S T M Standard C564-7970 (Rubber Gaskets for Cast Iron Soil Pipe Fittings).

d. Under Plumbing Fixtures add the reference to the AJVSI Standard for "Vitreous China Plumbing Fixtures" (Al12.19.2-1973).

Part D Heating,. Cooling, and Fuel-Burning Systems


2.2 Wherever nationally recognized standards and Part D of this Standard differ, the requirements of Part D shall apply.


2.3 An Appendix to this Part lists a group of Standards covering heating, cooling and fuel-burning appliances and systems which may be referred to for guidance. Deviations from the applicable portions of these Standards shall be permitted when they meet the performance requirements specified herein.

836 REVISIONS T O NFPA N O . 501B 501B-17 67. Chapter 3. Definitions. Add the following two new definitions..

a s s e m b l y c o m p o s e d o i i L s t c u , a , . ~ t " r "~ in accordance with the terms of listing to form a complete fireplace.

Fireplace Stove means a chimney connected solid fuel-burning stove having part of its fire chamber open to the room.

68. Chapter 3. Definitions. Move the definition of the word "Listed" to Part A (see Item 1).

69. Par. 4.2.4. I (Editorial). Delete the .Note following this Paragraph as the content of the .Note is identical with the last sentence of the Paragraph.

70. Par. 4.2.4.2(b) (Editorial). Insert the word "not" in the last sen. tence so that the sentence will read: "Construction shall be such that the blow will not be transmitted to the valve."

71. Par. 4.2.5.1 (Editorial). In the fourth line change the reference to "B.10" of the Standard for the Storage and Handling of Liquefied Pe- troleum Gases (.NFPA .No. 58-1972; A.NSI ZI06.1-1972) to "221."

72. Par. 5.1.2.1. Insert the appropriate Standard to cover threaded brass pipe in this Paragraph, the revised text to read:

5.1,2 .1 Steel or wrought-iron pipe shall comply with ANSI Standard B36.10-1970 for Wrought-Steel and Wrought-Iron Pipe. Threaded brass pipe in iron pipe sizes may be used. Threaded brass pipe shall comply with Standard Sizes and Specifications for Seamless Red Brass Pipe (ASTM B43-66).

73. Par. 5.1.4. (Table D-2). Change the Table designation in the 5th line of Paragraph 5.1.4 and on the Heading to the Table to "Table D- I" instead of "Table D - 2 " and change the heading of Part I of the Table to read:

TABLE D-I

Maximum Capacity of Different Sizes of P ipe and Tubing in Thousands of Btu's Per Hour of Natural Gas for Gas Pressures of 0.5 Psig or Less and a Maximum Pressure Drop of ~ Inch Water Column.

74. Par. 5.1.10.2. Change the figure "18" to "24" in the third line of the Paragraph so that the gas supply connection shall be "within 24 inches" of the left (road) side instead of "within 18 inches."

REVISIONS TO NFPA NO. 5 0 1 B 837 ~ Par. 5.1.11. Add to the present text a new sentence as iven "ust b ~a~ add to each Certificate the sentence given second below g~;or;~he belo°~s ,,Before turning on gas": . "

The connector capacity indicated on this tag shall be equal to or greater than the total Btuh rating of all intended gas appliances.

When connecting to lot outlet, use a listed gas supply connector for mobile homes rated at [ ] 100,000 Btuh

[ ] 250,000 Btuh or more.


5.1.13 Appliance Connections. All gas burning appliances shall be connected to the fuel piping. Materials as provided in Paragraph 5.1.2 of this Part or listed appliance connectors shall be used. Listed appliance connectors when used shall not run through walls, floors, ceilings or partitions. Connectors o fa luminum shall not be used outdoors.

7Z New Par. 5.1.13.1. Add theJollowing new text,.

5.1.13.1 Exterior Appliance Connection. A mobile home con- raining an LPG or combination LP-natural-gas-system may be provided with a gas outlet to supply exterior appliances when in-

ailed in accordance with the following:

(a) No portion of the completed installation shall project be- yond the wall of the mobile home.

(b) The outlet shall be provided with an approved "quick- disconnect" device, which shall be designed to provide a positive seal on the supply side of the gas system when the appliance is disconnected. A shutoff valve shall be installed immediately upstream of the quick-disconnect device. The complete device shall be provided as part of the original installation.

(c) Protective caps or plugs for the "quick-disconnect" device, when disconnected, shall be permanently "attached to the mobile home adjacent to the device.

(d) A tag shall be permanently attached to the outside of the exterior wall of the mobile home as close as possible to the gas supply connection. The tag shall indicate the type of gas and the Btuh capacity of the outlet and shall be legibly inscribed as follows:

THIS O U T L E T IS DESIGNED FOR USE W

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