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SINGLE LINE DIAGRAM (SLD) Or, ONE LINE DIAGRAM

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The singleline diagram is the blueprint forelectrical system analysis. It is the first step inpreparingacriticalresponseplan,allowingyouto become thoroughly familiar with theelectricaldistributionsystem layoutanddesigninyourfacility.

Whyitsrequired?

Whetheryouhaveaneworexistingfacility,thesingleline diagram is the vital roadmap for allfuture testing, service and maintenanceactivities.Assuch,thesinglelinediagramislikeabalancesheet foryour facilityandprovidesasnapshotofyourfacilityatamomentintime.Itneeds to change as your facility changes toensure that your systems are adequatelyprotected.

To make all the changes documented in acommonfile,makingtheelectricalsystemeasilyunderstandable for any technical personinside/outsideofthefactory.

An uptodate singleline diagram is vital for avarietyofserviceactivitiesincluding:

o Shortcircuitcalculationso Coordinationstudieso Loadflowstudieso Safetyevaluationstudieso Allotherengineeringstudieso Electricalsafetyprocedureso Efficientmaintenance

Whatshouldbeinasinglelinediagram(SLD)?

A typical package of single line diagram shallinclude:

Incominglinesshowingvoltageandsize

Incomingmainfuses,cutouts,switches,andmain/tiebreakers

Power transformers (rating, windingconnectionandgroundingmeans)

Feeder breakers and fused switches ratingandtype.

Relays(function,useandtype)

Currentand/orpotentialtransformerswithsize,typeandratio

Controltransformersrating.

All main cable and wire runs with theirassociatedisolatingswitches

Allsubstations, including integralrelaysandmainpanelswith total loadofeach feederandeachsubstation

Critical equipment voltage and size (UPS,battery, generator, power distribution,transfer switch, computer room airconditioning)

A summary load schedule for the LTswitchgearpanel.

A loadscheduleforeachdistributionpanelsandswitchboard.

Ratinganddimensionofbusbar.

Alloutgoingcableswithcablesizeandtypewith rating and type of their associatedisolatingswitches(e.g.circuitbreaker).

Length and voltage drop of all outgoingcables.

RatingofPFI ,changeover,ATS,generatorswith associated protection and isolatingswitch

Allearthingcablerating(size,typeetc.)

Allconnectedloadwiththeirindividualloadcapacity.

Allspareswitches(outgoingcircuitbreaker)shallbementioned.

Earthing system must be included withdimension of earthing pit, boring, earthelectrodesize,earthleadandECCcablesizeandtype.

Here isgivenanexampleofa typical LTpanelone linediagramor Single linediagram (try tofollowitasbestaspossible).

ACCO

RD

PROJECT NAME:

DRAWING TITLE:

Revisions

Date No Descriptions

Scale: Date:

LOAD SCHEDULE & SINGLE LINE DIAGRAM OF SMDB-S (SECOND FLOOR)

MEP CONSULTANT:

Note:

R=49.330 KWY=49.340 KWB=49.330 KWTL=148.000 KWDL=103.600 KW (70%)

PROJECT NAME:

DRAWING TITLE:

Revisions


Scale: Date:

SINGLE LINE DIAGRAM OF SMDB-FOF FIRST FLOOR

MEP CONSULTANT:

Note:


PROJECT NAME:

DRAWING TITLE:

Revisions


Scale: Date:

SINGLE LINE DIAGRAM OF SMDB-T OFTHIRD FLOOR

MEP CONSULTANT:

Note:


PROJECT NAME:

DRAWING TITLE:

Revisions


Scale: Date:

LOAD SCHEDULE & SINGLE LINE DIAGRAMOF SMDB-Fr. (FOURTH FLOOR)

MEP CONSULTANT:

Note:


PROJECT NAME:

DRAWING TITLE:

Revisions


Scale: Date:

LOAD SCHEDULE & SINGLE LINE DIAGRAMOF SMDB-Ff. (FIFTH FLOOR)

MEP CONSULTANT:

Note:


M

2x1c,120.0 mm2 Cu.

R=273.465 KWY=273.220 KWB=272.445 KWTL=819.130 KW

R=55.296 KWY=55.060 KWB=54.275 KWTL=164.630 KW

PROJECT NAME:

DRAWING TITLE:

Revisions


Scale: Date:

LOAD SCHEDULE & SINGLE LINE DIAGRAMOF LT PANEL

MEP CONSULTANT:

Note:

R=98.670 KWY=98.670 KWB=98.660 KWTL=296.000 KW

R=98.670 KWY=98.660 KWB=98.670 KWTL=296.000 KW

PROJECT NAME:

DRAWING TITLE:

Revisions


Scale: Date:

ELECTRICAL LOAD SCHEDULE & SINGLELINE DIAGRAM OF DB-R (ROOF FLOOR)

MEP CONSULTANT:

Note:

BYR

PHASE LOAD IN KW

POINTPER

WATT

POINTSNO. OFPOINT REFERANCESIZE

NUTRALPHASE

RATMCB

REF.CKT

B3

Y3

R3

B2Y2

R2

B1Y1

R1

TOTAL CONNECTED LOAD 8.015 KW

DS13--DS18

0.510DS7--DS12

DS19--DS24

10A SP

DB REF. : DB-R | FED FROM : RYB9/MDB-1 | LOCATION : CANTEEN (ROOF FLOOR)

REF.MCCB

20A

TP M

CB M

AIN

2.460TOTAL PHASE LOAD 3.260 2.295

(rm)SIZE

EARTH

(re)LOCATION

2X2.5 1X2.5 DS1--DS6 CANTEEN 6 0.51085Amp

0.510

6

6

85

85

TOTAL DIVERSIFIED LOAD (70%) 5.610 KW

06WAY (TP) 20A TP MCB MAIN | CABLE SIZE : 1X4c,6.0mm2 NYY/PVC+1X1c,6.0mm2 PVC S/C ECC

CANTEEN

TOILETS

10A SP

10A SP

10A SP

10A SP

10A SP

10A SP

10A SP

10A SP

B4

Y4

R4

STAIR LOBBY

10A SP

10A SP

10A SP

2X2.5 1X2.5

2X2.5 1X2.5

2X2.5 1X2.5

2X2.5 1X2.5

2X2.5 1X2.5

2X2.5 1X2.5

2X2.5 1X2.5

2X2.5 1X1.5

DS25--DS30

DS31--DS36

DS37--DS42

DS43--DS48

L1--L6+EXF1--EXF2

L12--L19+F1--F3

L20--L27+F4--F6

L7--L11

6 85

6

6

85

85

6 85

6

6+2

85

25/100

8+3 40/70

8+3

5

40/70

25

0.510

0.510

0.510

0.510

0.510

0.350

0.530

0.530

0.125

B5

Y5

R5

CANTEEN

20A SP

20A SP

20A SP

2X4.0 1X4.0

2X4.0 1X4.0

2X4.0 1X4.0

S1--S2 (RADIAL)

S3--S4 (RADIAL)

S5--S8 (RADIAL)

2 200

2

4

200

200

0.400

0.400

0.800

B6

Y6R6 SPARE

S9--S12 (RADIAL)

SPARE

M.PRAYER ROOM

F.PRAYER ROOM

2X2.5 1X2.5

2X2.5 1X2.5

2X2.5 1X2.5

CANTEEN

CANTEEN

CANTEEN

CANTEEN

CANTEEN

CANTEEN

F.PRAYER ROOM

M.PRAYER ROOM

20A SP 2X4.0 1X4.0

20A SP - -

10A SP - -

- -

4-

200-

0.800

-

-

TP MCB

20A

DB-R6WAY

TL=8.015 KWB=2.295 KWY=3.260 KW

FED FROM RYB9/MDB-1

6WAY, 20A TPN+E COPPER BUS BAR

R=2.460 KW

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

10A

MCB

SP

DS

1--DS

6

DS

7--DS

12

DS

13--D18

DS

19--DS

24

DS

25--DS

30

DS

31--DS

36

DS

37--DS

42

DS

43--DS

48

L1--L6+EX

F1--EX

F2

L7--L11

L20--L27+F4--F6

L12--L19+F1--F3

DL=5.610 KW (70%)

+1X1c,6.0mm2 PVC S/C ECC

1X4c,6.0mm2 NYY/PVC

20A

MCB

SP

20A

MCB

SP

20A

MCB

SP

S5--S

8 (RA

DIA

L)

S3--S

4 (RA

DIA

L)

S1--S

2 (RA

DIA

L)

SP

AR

E

S9--S

12 (RA

DIA

L)

SP

AR

E

20A

MCB

SP

20A

MCB

SP

10A

MCB

SP

1x1c ECC 240 mm

2

BYA/NYY (or

10-12 mm dia bare copper wire

1x4c 240 mm2 BYA/NYY1x1c ECC 240 mm

2

BYA/NYY (or


1x1c ECC 240 mm

2

BYA/NYY (or


600 A (adjustable)MCCB

ACCO

RD

SHAHIN AZADStamp

SHAHIN AZADTypewriterSAMPLE ELECTRICAL SINGLE LINE DIAGRAM (SLD

SHAHIN AZADRectangle

SINGLE LINE DIAGRAM (SLD) Or, ONE LINE DIAGRAM

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ACCO

RD

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