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December 5, 2007STANDARDIZATION COMMITTEE OF

PETROLEOS MEXICANOS AND ITS SUBSIDIARIES

Page 1 of 157TECHNICAL STANDARDIZATION COMMITTEE

OF PEMEX EXPLORACION Y PRODUCCION

1 COPYRIGHT - ONLY END USERS - ALL DOCUMENTS ARE PROTECTED - ONLY END USERS - DOCUMENTS CANNOT BE DISTRIBUTED OR SOLD

ELECTRICAL FACILITY DESIGN

This Standard cancels and substitutes NRF-048-PEMEX-2003, dated July 22, 2003

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CONTENT

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CONTENT

CHAPTER PAGE

0. INTRODUCTION

1. OBJECTIVE

2. SCOPE

3. APLICATION FIELD

4. UPDATES

5. REFERENCES

6. DEFINITIONS

7. SYMBOLS AND ABREVIATIONS

8. DEVELOPMENT

8.1. Overview

8.1.1 Design documents

8.1.2 Electrical design drawings

8.1.3. Information to be contained on the Electrical Design drawings

8.1.3.1 Single line diagram drawings

8.1.3.2 Canalizations and conductors schedule drawings

8.1.3.3 Electrical equipment setup drawings

8.1.3.4 Force distribution drawings

8.1.3.5 Area classification drawings

8.1.3.6 Lightning and Vessel drawings

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8.1.3.7 Grounding systems and lightning rods drawings

8.1.3.8 Elemental diagrams and interconnection drawings

8.1.3.9 Typical and specific details

8.1.4 Updated As- Built drawings

8.1.5 Calculation report

8.1.6 Design validation

8.1.7. NOM-001-SEDE compliance verification

8.2 Distribution systems

8.2.1 Overview

8.2.2 Secondary selective system characteristics

8.3 Generation

8.3.1 Overview

8.3.2 Location

8.3.3 Selection

8.3.4 Protection

8.3.5 Instrumentation

8.4 Electrical Distribution

8.4.1 Aerial lines Electrical Distribution

8.4.1.1 Aerial lines structures

8.4.1.2 Aerial conductors

8.4.1.3 Electrical equipment connected to aerial lines.

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8.4.2 Aerial electrical distribution by conduit pipes

8.4.2.1 Offshore platforms electrical distribution

8.4.3 Aerial electrical distribution through tray brackets type for conductors

8.4.3.1 Tray type supports for aluminum metallic conductors or galvanized steel.

8.4.3.2 Tray type supports, for the reinforced fiberglass conductors.

8.4.3.3. Tray type support for vinyl (PVC) polychlorure conductors.

8.4.4 Electrical underground distribution

8.4.4.1 Conduit Pipes in underground duct bank

8.4.4.2 Underground duct banks

8.4.4.3 Underground well logs

8.4.5 Electrical installations conduits

8.4.5.1 Overview

8.4.5.2 Underground Installation

8.4.5.3 Cable types

8.4.5.4 Cable installation

8.4.5.5 Energy cables field test

8.4.6 Underwater Electrical Distribution

8.4.6.1 Path

8.4.6.2 Splice

8.4.6.3 Protection

8.4.6.4 Underwater crossings

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8.5 Connections

8.6 Substations

8.6.1 Overview

8.6.2 Location

8.6.3 Capacitors Bank

8.6.4 Substations linked with PEMEX

8.6.5 Pemex type Industrial substations

8.6.6 Protections

8.7 Pemex type Industrial substations with electrical control room, battery room,transformer shed and aerial conditioner and/or pressurization room

8.7.1 Overview

8.7.2 Two-level electrical control room

8.8 Transformers

8.8.1 Overview

8.8.2 Transformer protection

8.8.3 Oil or insulating fluid Transformers

8.8.4 Oil or insulating fluid transformers characteristics

8.8.5 Oil or insulating fluid transformers factory tests

8.8.6 Dry type transformers impregnated in Varnish

8.8.7 Dry transformers type test in epoxy resin

8.8.8 Test for dry type transformers in epoxy resin

8.9 Panels

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8.9. 1 13, 8 and 4, 16 kV Medium voltage panel

8.9.2 Engines control center 4, 16 kV medium voltages in

8.9.3 Engines control centers 480 V low voltage

8.9.4 Electrical charges supply 220/127 V low voltage,

8.9.5 Engines control center 220 V low voltage

8.9.6 Auto supported distribution panels 220/127 V low voltage

8.9.7 220/127 V Lighting and contact panels

8.10 Motors

8.10.1 Overview

8.10.2 Induction Motors

8.10.3 Synchronous motor

8.10.4 Inspection, test and shipment

8.10.5 Local control station (End station motor button)

8.11 Grounding systems and lighting conductors

8.11.1 Grounding System

8.11.2 Lightning conductor system (Protection system against atmospheric discharges)

8.12 Lighting Systems

8.12.1 Overview

8.12.1.1 General Lighting

8.12.1.2 Localized general lighting

8.12.1.3 Localized lighting

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8.12.1.4 Exterior lighting

8.12.1.5 Offshore platforms

8.12.1.6 Heliports in land facilities

8.12.2 Lighting calculation

8.12.2.1 Interior lighting

8.12.2.2 Exterior lighting

8.12.3 Illumination Levels

8.12.4 Characteristics of the lighting system

8.12.5 Vessel

8.12.5.1 Vessel for portable equipment inside process areas.

8.12.5.2 Vessel for welding inside process areas.

8.12.5.3 Vessel for building interiors

8.13 Emergency Systems

8.13.1 Emergency power sources.

8.13.1.1 Batteries system

8.13.1.2 Generator group

8.13.1.3 Uninterruptible power supply

8.13.1.4 Separate connection

8.13.1.5 Lighting unit equipment

8.13.2 Generator group (emergency plants) characteristics.

8.13.2.1 Overview

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8.13.2.2 General characteristics of the generator group

8.13.2.3 The characteristics of the generator group main components.

8.13.2.4 Specific characteristics of the main generator group

8.13.3 Characteristics of the uninterruptible power supply systems

8.14 Equipment wiring (electrical charges)

8.15 Short circuit studies, protection coordination, power flow & power systemstability

8.15.1 Short circuit studies and protection coordination

8.15.2 Power flow studies

8.15.3 Studies of the power system stability

8.16 Current limiting Reactors

9 RESPONSABILITIES

9.1 Of Petroleos Mexicanos, Its Subsidiaries

9.2 Technical Standardization Subcommittee Pemex Exploracion y Produccion

9.3 Manufacturers, suppliers and service providers

10 CONCORDANCE WITH MEXICAN OR INTERNATIONAL STANDARDS

11 BIBLIOGRAPHY

12 APENDIX

Annex Spacing between aerial conduit pipes

Annex B Spacing between underground conduit pipes

Annex C Automatic transfer system in panels

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Annex D Field Test

Annex E Definition of design options allowed in this M-1 NRF-048-PEMEX-2006 for the projectselectrical installations.

Formats

Format 1 480 V Power cables and motor control tests

Format 2 4, 16 kV power cables and motor control test (2 pages)

Format 3 13, 8 kV power cables and motor control test (2 pages)

Format 4 Low voltage cables test

Format 5 4, 16 kV medium voltage cables test

Format 6 13, 8 kV medium voltage cables test

Format 7 115 kV high voltage cables test

Format 8 Motor Insulation resistance test

Format 9 Panel Insulation resistance test

Format 10 Medium voltage 5 kV panel test

Format 11 Medium voltage 15kV panel test

Format 12 Electromagnetic switch Test

Format 13 Medium voltage switches and contactor test

Format 14 transformers, insulation resistance, relation of transformation and dielectric rigidity inoil tests.

Format 15 Transformer rewind ohm resistance test.

Format 16 Power factor test to rewind and liquid insulated transformers

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0. INTRODUCTION:

The distribution of electrical energy at Petroleos Mexicanos plants and its Subsidiaries is carried out byparticular specifications due to the nature of ducts handled in its process plants (hydrocarbons and itsderivate) and to the site environmental conditions, in its different installations such as industrial, as wellas offices, shops, hospitals among others.

In this context, the electrical facilities have a very important role, being the link between the generatorplants or power supply sub-stations and the consumption centers providing the equipment with thenecessary energy for their performance.

By the foregoing and with the purpose to comply with the required specifications for the electricaldesign and to guarantee the quality of the equipment and materials of the plant as well as the powergranted by the Federal law of Metrology and Standardization (LFSMN), Petroleos Mexicanos issues thepresent reference standard, in conjunction with the experience acquired by the company in thedevelopment of recent works with the current technological advances.

This standard was developed in requirement and compliance with:

Federal Metrology law. Standardization and its Regulations.

Public works and Services law and its regulations

Acquisitions, Leases and public sector services Law and regulations.

General Law of ecological balance and Environmental protection and its Regulations

Guide for the issuance of Reference standards of Petroleos Mexicanos and its Subsidiaries.

The following bodies participated in this Standard:

PEMEX- Exploracin y Produccin

Pemex Refinacin.

Pemex Gas y Petroqumica Bsica

Pemex Petroqumica

Pemex Corporativo

Petrleos Mexicanos

External Participants:

National Chamber of Electrical Manufacturers Panel of Mechanical and Electrical Engineers

Mexican Institute of Petroleum

Plastic Coatings of the Southeast, SA of C.V.

Schneider Electric Mexico, S. A of C. V

Cablofil Mexico, S.A. of C. V

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1. OBJECTIVE

To establish the technical and documentary requirements, Contractor must comply withelectrical installation design service contracting at Petroleos Mexicanos and its subsidiaries.

2. SCOPE

This Reference Standard (NRF) establishes the guidelines, criteria and requirements for thedesign of electrical installations in industrial plants, offices, hospitals, stores, shops and otherworks of the institution whether new, voltages or renovations.

This standard voids and substitutes NRF-048-PEMEX-2003 dated July 22 of 2003.

3. APPLICATION FIELD

This Reference Standard (NRF) is of general application and of obligatory compliance in theacquisition of service for the design of electrical installations that are performed in the workcenters of Petroleos Mexicanos and Its Subsidiaries. By the foregoing, it must be include in theprocedures of contracting, public the bid basis, invitation of as minimum three people, or bydirect award, as part of the requirements that the supplier, contractor and bidder must complywith.

4. UPDATES

This standard must be reviewed and in its case modified as minimum every 5 years or before ifthe suggestions and recommendations merit a change register it in the Annual Program ofStandardization of Petroleos Mexicanos

The suggestions for the review and update of this standard must be sent to the Secretary of theTechnical Standardization Subcommittee of PEMEX-Exploration and Production (PEMEX-Exploracin y Produccin), whom must schedule and proceed with the updates according to

their provenance and in its case register it in the Annual Program of Standardization of PetroleosMexicanos through Standardization Committee of Petroleos Mexicanos and Its Subsidiaries

The change of proposal and suggestions must be made in CNPMOS-001-A01 format of StandardReference Emission Guide CNPMOS-001-A0, Rev. 1 of September 30 2004 and address it to:

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PEMEX-Exploracin y Produccin.

Subdireccin de Distribucion y Comercializacin, Coordinacin de Normalizacin.Baha de Ballenas 5, Edificio D, PB., entrada por Baha del Espritu Santo s/n. Col. VernicaAnzures, Mxico D. F., C. P. 11 300Direct Number: 1944-9286PBX: 1944-2500 extension 380-80, Fax: 3-26-54Email address:[email protected]

5. REFERENCES

The application of this NRF is complemented by the following valid standards.

(The applicable edition of a project is the valid edition through the sixth natural day previouspresentation act and opening of the bid basis proposals, unless specifically indicated by otheredition (according to LOPSRM Art 33).

5.1 NOM-001-SEDEElectrical Installations. (Utilization).

5.2 NOM-002-SEDESafety and energy efficiency requirements for distribution transformers.

5.3 NOM-002-STPSConditions of safety, prevention, protection and firefighting at work centers

5.4 NOM-008-SCFIGeneral System of Units Measurement

5.5 NOM-025-STPS - Lighting conditions that the work centers must have

5.6 NOM-113-SEMARNAT - Establishes the environmental protection specifications for planning,design, construction, operation and maintenance of electrical power or distributionsubstations that are intended to locate in urban areas, suburban, rural, agricultural, industrial, ofurban or service equipment and tourism .

5.7 NOM-114-SEMARNAT - Establishes the environmental protection specifications for planning,design, construction, operation and maintenance of electrical power or distributionsubstations that are intended to locate in urban areas, suburban, rural, agricultural, industrial, of

urban or service equipment and tourism .

5.8 NMX-J-098-ANCEElectrical Power Systems- Supply- Standard Electrical Voltage

5.9 NMX-J-116-ANCE - Electrical Ducts- Pole and substation distribution transformers Specifications
mailto:[email protected]:[email protected]:[email protected]:[email protected]

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5.10 NMX-J-118/1-ANCE Electrical Ducts Lighting and distribution panels in low voltage

specification and test methods.

5.11 NMX-J-118/2-ANCE - Electrical Ductslow voltage power distribution panelsspecifications andtest methods.

5.12 NMX-J-123-ANCE - Transformers, insulating mineral oils for transformers.

5.13 NMX-J-149/2-ANCE Electrical Ducts- Electrical fuse, part 2, Circuit breaker expulsion fuse forhigh-voltage-Specifications.

5.14 NMX-J-203-ANCE - Parallel Connection Power Capacitors - specifications and test methods.

5.15 NMX-J-235/1-ANCE - EnclosuresEnclosures (Cabinets), for use in electrical equipment- part 1,General requirements- specifications and test methods.

5.16 NMX-J-235/2-ANCE - EnclosuresEnclosures (Cabinets), for use in electrical equipment- part 2,General requirements- specifications and test methods.

5.17 NMX-J-266-ANCE - Electrical Ductsswitches molded case automatic switchSpecificationsand Test methods.

5.18 NMX-J-284-ANCE - Electrical Ductspower transformersSpecifications.

5.19 NMX-J-285-ANCE - Electrical DuctsSingle and Three phase pedestal distribution transformersfor underground distributionSpecifications.

5.20 NMX-J-323-ANCE - medium voltage sectionalize blades with charge - Specifications and testmethods

5.21 NMX-J-351-ANCEDistribution and power dry transformers - Specifications

5.22 NMX-J-353-ANCEMotor control center

5.23 NMX-J-511-ANCE - Tray brackets system for metallic alloy conduits.

5.24 NMX-J-534-ANCE Heavy duty steel pipes (conduit) for electrical conduit protection and itsaccessories- specifications and test methods.

5.25 NMX-J-535-ANCE - of steel semi- heavy type for the electrical conduit protection and itsaccessories- specifications and test methods.

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5.26 NMX-E-012-SCFI - Pipes and connections of non-plasticized polyvinyl chloride (PVC) for electrical

installations.

5.27 IEC- 60034-1 - Rotating electrical machines Part. 1. Rating and Performance.

5.28 IEC-60289 - Reactors, second edition.

5.29 IEC-60 947-1 - Low voltage switchgear and control gear - Part 1 - General rules.

5.30 IEC-60 947-2 - Low voltage switchgear and control gear - Part 2 Circuit Breakers

5.31 IEC-61537 - Cable tray systems and cable ladder systems for cable handling.

5.32 IEC-62271-100 - High-voltage switchgear and control gear part 100: High voltage alternatingcurrent circuit breakers

5.33 NRF-010-PEMEX-2004 Minimum spacing and criteria for distribution of industrial installations atwork centers of Petroleos Mexicanos and Its Subsidiaries.

5.34 NRF-011-PEMEX-2002Detection and alarm systems

5.35 NRF-036-PEMEX-2003Hazardous Areas Classification and electrical equipment selection

5.36 NRF-072-PEMEX-2004Firewall Wall

5.37 NRF-095-PEMEX-2004Electrical Motors

5.38 NRF-102-PEMEX-2005 - Fixed fire extinguishing based on carbon dioxide systems

5.39 NRF-143-PEMEX-2006Distribution Transformers

5.40 NRF-144-PEMEX-2005Power Transformers

5.41 NRF-146-PEMEX-2005Medium voltage distribution panel

5.42 NRF-147-PEMEX-2006Station type surge arrester

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6. DEFINITIONS

For purposes of this NRF, the following definitions apply:

6.1 Service Connection/Tapping: Derivation that connects to the electrical supplier network withthe user facilities. Also applies to the point or feeding area for equipment and electricalsubstations.

6.2 Lighting surge arrester: Protection device that limits the transitory voltages in the circuits andelectrical equipment discharging on the associated current; preventing the continuous flux ofthe ground current and is capable of this function.

6.3 As Built: Updated as built drawings

6.4 Capacitor Bank: Group, unit or capacitor package cabinet mounted with control equipment forpower factor (for manual or automatic correction)

6.5 User Basis: Documentation in which the service needs are established by the user and thegeneral scope of the works to be developed by the service provider.

6.6 Design basis: Documentation based on the established requirements in the user basis and is theset of required technical specific information for the development of a project.

6.7 Technical Bid Basis: Is the document containing the technical requirements for the works to bedeveloped, and which the interested parties must comply with to participate in the bid basis.

6.8 Hazardous Areas Classification: Is the area arrangement of facility in basis of risk for hazardousatmospheric presence.

For the Hazardous Areas Classification, one of more drawings are made, taking as basis theprocess and instrumentation diagram, the equipment general arrangement drawing and thetypes of hazardous fluids that are handled. This drawing allows selecting equipment andmaterials.

6.9 Piping junction box (condulet) Box designed to provide access to the interior of a pipe throughone or more removable covers.

6.10 Canalization: metallic or non-metallic closed or open channel, expressly designed to containelectrical conduits

6.11 Grounding conductor: Conductor used to ground an equipment or circuit of a wiring system, tothe grounding electrode or electrodes

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6.12 Compression type connector: Mechanical device used to splice two electrical conduits in which

the pressure to fasten the connector to the conduit it is applied externally, modifying the sizeand shape of the connector and conduit.

6.13 Tray: Is a section or set of sections and accessories that form a rigid structural system open,metallic or non-metallic to support and accommodate electrical conduits.

6.14 Grounding Electrode: Metallic body in last contact with the ground, destined to establish aconnection with it, must be of a corrosion resistant material and good conduit, such as cooperor cooper with alloy

6.15 Splice: Device which functions is to ensure the electrical and mechanical continuity of twoconduit sections.

6.16 Equivalent: The term or equivalent that is described following the number and title of thetechnical specifications related to this standard ( or requisition or technical basis) , to say thatStandard document that is proposed as an alternative from the aforementioned, must regulatethe product parameters or required service as minimum of the same values and characteristicsof the compliance appointed by the originally cited specification, applicable to its designmanufacture, construction, installation, inspection, test, operation or maintenance, as isconcerned.

6.17 Structure (applied to aerial lines) Main support unit (metallic, concrete or wood) generally apole or a tower.

6.18 Arrow: Vertical distance measured from the lowest part of the conduit (overhead power cable)up to an imaginary straight line those connections the two points of support.

6.19 Arrow between supports: Is the existing distance between a tray support and another.

6.20 HAZOP (Hazard and Operability Method): Is the study of the risk analysis in the operation of aprocessing plant.

6.21 Data Sheet: Is a document in with the equipment information is indicated such as: service,conditions of operation, type of materials, characteristics and equipment components.

6.22 Basic Engineering: Is the general basic technical information in function of the user and designbasis, that works as a starting point to develop the detail engineering, In it the principalinstallation characteristics are defined and includes the descriptive memory of the project, datasheets and technical Specifications of the main equipment , general Single line diagram, list ofelectrical equipment, general power distribution, arrangement of electrical equipment and areaclassification.

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6.23 Aerial lines: Is constituted by bare, lined or insulated electrical conduits spreader in the building

exterior or open spaces and are supported by poles or other kind of structures with thenecessary accessories for the fastening, separation and insulation of the same conduits.

6.24 Underground Lines: Is constituted by one or several insulated conduits that part of an electricalcircuit placed at the ground level, either buried directly, in ducts or in any other canalization.

6.25 Calculation report: This are the design engineering calculations that are executed and serve asbasis for the development of the basic and detail engineering allowing to define the equipmentand material specifications.

6.26 Lightning rod: Protection device against atmospheric discharges that is connected directly to deground, without interconnection to the electrical system.

6.27 Grounding network: Is a protection network used to establish a uniform voltage in and aroundany metallic structure, process lines or equipment. Is firmly spliced to the ground electrodes.

6.28 Grounding resistance: Is the connection resistance to the ground system, in respect to a remoteland or to the determined by the Laurent formula.

6.29 Ground resistivity: Is the resistance by unit length, land specific, determined in the place wherethe ground system is located or will be located.

6.30 Ground: Dispersion or attenuation element of electrical currents.

7. SYMBOLS AND ABREVIATIONS

7.1 SYMBOLS

Measurement unit symbols used to comply with NOM-008-SCFI as follows:

A amperecd flame

C Celsius degreed daydb decibel ohmh hourHz hertzkg kilogramK kelvin

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lm lumen

lx luxm meters secondV voltW watt

7.2 Abbreviations

In the contents of this reference standard diverse abbreviations are mentioned and they are describedas follows:

ACSR Aluminum Conductor Steel ReinforcedANCE Standardization and Certification Association, A.C.ANSI American National Standards instituteAPI American Petroleum InstituteASTM American Society for Test and MaterialsAWG American Wire GaugeCP Horse powerc.a. Alternating currentc.c. Continuous currentCCM Motor control centerCFE Federal Electric Commission

EP EthylenePropyleneEPC Engineering, Procuring and Constructionf.p. Power FactorICEA Insulated Cable Engineers AssociationIEC International Electro technical CommissionIEEE Institute of Electrical and Electronics EngineersISA Instruments Standards AssociationkA Kilo amperekCM Kilo Circular MilkV KilovoltKVA Kilovolt ampere

kW KilowattkWh Kilowatt-hourLED Light Emitting DiodeMVA Megavolt ampereMW Megawatt.NEMA National Electrical Manufacturers AssociationNESC National Electric Safety CodeNFPA National Fire Protection Association

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NMX Mexican Standard

NOM Official Mexican StandardNPT Finished Floor LevelNRF Reference StandardPEMEX Petroleos MexicanosPVC Polyvinyl-ChlorideRMS Root medium squarer/m revolutions per minuteRTD Resistance Thermal DetectorSCD Distributed control SystemSTPS Ministry of Labor and Social WelfareTEFC Total enclosed fan cooledTEAAC Total enclosed air-air cooledTEWAC Total enclosed water-air cooledTHW-LS Thermoplastic Insulation resistance to heat moisture, fire spreading, reduced emission

of smoke and acid gasTHHN-THWN Thermoplastic with nylon cover resistant to heat moisture and fire spreading and

reduce emission of fumes and acid gasTHHW-LS Thermoplastic insulation resistant to heat, moisture, fire speeding and reduced

emission of fumes and acid gasRHH-RHW Synthetic polymer or crossed link insulation, resistant to heat for dry or humidity

places.- Synthetic polymer or crossed link resistant to heat for dry or humid placesUL Underwriters LaboratoriesUVIE verification of electrical installations Unit

USG United States GaugeXP Explosion proofXLP Cross linked polyethylene insulationIcc Flow of short-circuits.n.m. At sea level

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8. DEVELOPMENT

8.1 OVERVIEW

8.1.1 Design Documents

For the elaboration of the design engineering must comply with the following:

a)

Documents to be provided by PEMEX.a1) User basis, (including operation philosophy)a2) PEMEX, according to the type of contracting, can supply the design basis

b)

Documents that the service provider must provideb1) Design basisb2) Basic Engineeringb3) Main equipment specification and Data sheetb4) Equipment requisitionsb5) Material requisitionsb6) Calculation reportb7) Detail engineeringb8) Technical basis of the bid basis ( in the established modality, key on hand, price unit, directadministration)b9) Project Bookb10) Additional Studies ( requested in the bid technical basis)b11) drawings updated as built ( in case is requested In thebid basis technical basis)

c)

The documentation and drawings generated by the service provider during the development ofthe electrical design must be delivered to PEMEX, with signatures of the responsible personnelof the service provider responsible of its elaboration.

d)

Service provider must facilitate to PEMEX personnel to carry out the supervision of the advanceof design and the technical content of the documents.

e)

PEMEX approval through an officially designated personnel for the project must be with a hand-written signature as minimum the design basis or basic engineering.

f)

Once the basic engineering has been validated and accepted by PEMEX, the service provider isresponsible for the detail engineering submitted.

g) Works must be delivered in original and copies and quantity will be indicated in the bid basistechnical basis, the electronic files must be delivered depending on the volume of the

information, in a compact disk or DVD with a compatible or exportable format ( for example.Windows office, CAD computer assisted design software.h)

Documents and drawings original must be made in paper that allows to obtain clearreproductions as indicated as follows:

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i)

Documents must be prepared in letter, legal or ledger size, as required by PEMEX.j)

Drawings must be prepared in size "D" 896 x 560 mm (35 in. x 22 in.), size "E" 1 065 x 840 mm(42 in. x 33 in.), in some cases a special size can be used, depending on the scale and size of thefacility to display.

8.1.2 Electrical Design Drawings

Letters and numbers in the drawings must be according to the following:

a)

On dimensions and text explanatory of drawing Arial normal, capitalization 2.0 mm; forsubtitles Arial normal 3.5 and 4.5 mm in lower; in details Arial normal capital letter 3.0 mm.

b)

Drawings must be developed with data and format of Drawing foot" as stated in the technicalbid basis.c)

For drawing titles, first, the project general description must be specified, secondly, thesubdivision or area and at the bottom with small letters the description and location area ofelectrical installation.

d)

Drawings showing electrical installations in buildings or areas must be represented on a scale inwhich the facility is seen clearly enough to be interpreted correctly.

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e.

Drawings must be prepared in Spanish, in metric, in meters or millimeters systems, indicating

scale, geographic north and construction, prevailing wind direction and prevailing, coordinateswith a unique reference source for the whole plant or installation.f. When the electrical installation comprises of two or more levels, in elevation drawings for

better understanding of the drawing must be done.g. Electrical facilities drawings must contain mainly data relating thereto, and the data required

from other disciplines to the correct interpretation of the electrical installation (i.e.,architecture, civil area, planning, piping, instrumentation). These must include sufficientinformation to allow the execution of the works, using typical details, specific details, footnotes,and clear references must be made in the body of the drawing.

h.

Symbols used in the project must be shown on the drawings, as described on the technical bidbasis.

8.1.3 Information to be contained in the electrical design drawings

The minimum drawing content, depending on the type of installation, are shown below:

8.1.3.1 Single-line Diagram Drawings

a. Characteristics of electric power supply of the suppler or electrical generator, such as voltage,frequency, phase, number of threads, input to three phase and single phase short circuit. In thecase of electric generators the power in MVA must be given, the power factor (pf), the speed in

revolutions per minute (r/m), the values of transient reactance, sub transient and synchronous,power, power factor and speed.

b.

For electrical circuits, indicate number of circuit capacity in kVA or kW, capacity and type ofprotective device. Optionally specify length, voltage drop in percent, size, size and number ofconductors, number of pipe according to conductor schedule and conduit.

c.

On all electrical design documents and drawings that require it, the size of the wires inmillimeters square brackets AWG or KCM must be indicated.

d.

Processors must indicate the power in kVA, phases, type of connection and grounding, coolingtype, voltage on the primary side and secondary impedance per cent, number key equipment,temperature rise.

e. Electrical panels must indicate:

e1 Bars: current and rated voltage, short circuit capacity, number of phases, and number ofthreads, frequency and ca or dc current density of bars, tie and earth.e 2) switches: the number of poles, current and trip current framework, through the arcextinction, nominal capacity and voltage control (for circuit breakers).e3) electric power charge in CP/kW/kVA.e4) Starters: Type, capacity, type of starter, overload protection type, size, NEMA, controlvoltage and number of poles.e5) thermostatically controlled heating resistors: voltage, power in watts and number of phases,

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controlled by thermostat.

e6) manual-automatic transfere7) Current transformers and potential: transformation ratio, quantity, number of side-loadingcapacity (burden), precision voltage level.e8) Measuring instruments: measurement range, amount, indicate whether it is analog ordigital. It must display the features (parameters and characteristics) of the measuringequipment.e9) Emergency Plant capacity in kW or kVA continuous and emergency phases, connection type,frequency, voltage, r/m, power factor, fuel type.e10) Relays: function performed according to the numbering ANSI relay technology, quantity,type indicate whether MFP.

f.

The diagram must show the installed charge in kVA and kW total and feeder, the totalconnected load, demand factors, charge factors of motors and power factor, and the defendantor charge operation (load after implement the above factors).

g.

All equipment (generators, transformers, grounding resistors, panels, motor control centers,etc.) indicate the key equipment, specification and/or requisition order number of the team.

h.

All values given must be backed up in memory of calculations.

8.1.3.2 drawings conductors cards and channeling. It must show in this type of plane:

a.

Number of circuit (must correspond as the one indicated in the Single line diagram).b.

Service type (power, lighting, control or available).

c.

Circuit origin and destination.d.

Power of the electrical charge (kW, kVA, PA).e.

Electrical charge nominal current. (in amperes)f.

Circuit operation voltage, voltage drop in percent, and number of conductors per phase, size,caliber and length of conductors.

g.

Nominal size (diameter), length and number of conduit.h.

Additional information for clarification, in the "Remarks" area.

8.1.3.3 Electrical Equipment Setup Drawings:

a.

It must show in plan and elevation the arrangement of internal and external electricalequipment indicating its orientation, size and distance to axis construction, drawings to anchor.b.

It must indicate dimensions and depth of holes, trenches and/or logs .c.

This type of drawing must be projected initially with the larger main equipment of the leadingmanufacturers and subsequently updated with the manufacturers certified dimensions. It mustshow the direction in which the doors open, dimensions, cyclone mesh, ladders, Single linediagram on wall, location of fire extinguishers and data as well as the main characteristics andfire alarm system. It must refer to the drawing distribution of smoke detectors.

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indicating which ducts are present or which may be present, creating the hazardous area (classified),

indicating its ignition temperature, point of vaporization (flashing) and the group they belong. Includinga table of selected electrical equipment (usually lights) for the project, indicating the maximumtemperature at which they work, according to Table 500-5d of the NOM-001-SEDE, temperature mustbe lower than the temperature of ignition of the product is handled in this hazardous area so provisionscontained in Chapter 5, special environments of NOM-001-SEDE, as stated in the NRF-036-PEMEX-2003,and this standard, can be objectively verified.

These drawings will also serve as basis for selection of equipment and material used in the project.

8.1.3.6 Lighting and vessel Drawings

a.

for lighting and vessel drawings. Such drawings must show the distribution of lighting,comparing them or possibly placing them on ceiling, must indicate circuit number to which itbelongs, damper that controls it, stages and features, such as power rating area, type of ballast,reflector, diffuser, guard or other steps necessary. It must indicate the path of the wiring andpipe nominal size (diameter) of pipe, location of key distribution panel type, full charge table(number of circuits, number of panel circuit capacity in amperes per phase, number and type oflighting, amount and type of vessel and circuit protection type, indicating the unbalance load,lightening height mounting

b. Vessel must be located equally distributed in areas where required, showing circuit number,quantity, size and caliber of conductor and nominal size (diameter) pipe and its mountingheight, indicate whether it is for classified area, normal weather.

c.

For exterior lighting, the type of pole, accessories support, path, nominal size (diameter) of pipeand number and size and caliber of conductor that panel that controls the circuit, voltage,phases, general data luminaries, mounting height and details electrical construction must beshown.

8.1.3.7 Ground and Lightning Rod Drawings

a. Ground and Lightning Rod Drawings, must show the overall network of lands and the system ofinstalling lightning rods, showing size, caliber and type of conductor, the network path, landlogs, type of electrodes, connector type, and depth of the mesh. It must indicate a general

symbol land and lightning show and description of key elements.b.

Give the ground resistivity obtained from field measurements and the expected total resistanceof the mesh.

c.

Indicate the reference to the ground plans and specific arrester different areas, which mustshow the connections to electrical equipment, towers, structures, pipe supports, ground rodsand in general all the elements to connect.

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8.1.3.8 Elemental Diagram and Interconnection Drawings

Elementary diagrams must be made in order to determine the project's own power system control andthe relationship between the electric field and the areas of instrumentation and control, and processautomation, such as control of electric motors, in these diagrams must be shown as connecting theelectrical control elements such as coils, switches, selectors, relays, pilot lights, contacts, among others,a key indicator, terminal panels, wiring, and additional information. Interconnection diagrams mustshow the location of different elements control described above, including wiring and circuit number.These diagrams must be supplemented with information from mechanical flow diagrams the processarea and links logic and sequence control of the area of instrumentation and process control andautomation, making it convenient to refer to the documents of these specialties.

8.1.3.9 Typical and Specific Details

It is important for the understanding of the electrical installation project and for the purchaseapplication and site application of the electrical equipment, generating installation details that aretypical when implementing in different situations within the project and specific when applied to asingle situation. They must show how to install, including the support method and describe thematerials, stating the diameters, sizes, Catalog of the proposed trademark or equivalent.

8.1.4 As Built Updated Drawings

For projects involving construction works, As Built Updated Drawings must be handed to PEMEX,following the construction of the electrical works, which are generated from the final drawings electricproject, they must incorporate the changes or adjustments in the course of the works. It must be takeninto account changes in the log of the work, and at the field of electrical work, verified with fieldsurveys. Changes must be reviewed with the personnel monitoring the project by PEMEX andContractor.

Drawings must be delivered printed and electronically and identified as "As Built Updated Drawing" or"as built" .

8.1.5 Calculation Reports

a. Service provider must submit the reports to calculate the final draft of the electrical installation withwhich determines the characteristics and capabilities of electrical system components, including:

a1) switches and fuses.a2) Conductors.

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a3) Pipes.

a4) Channelsa5) starters.a6) panels.a7) Generators.a8) Emergency Plant.a9) Other equipment (reactors, capacitors, arresters, battery chargers, electrical traces, etc.)b) It must also present, calculations of:b1)Mono and Trifasic short circuit.b2) Voltage drop.b3) Ability to conduct current (AMPAC), dimensions of ducts.b4) exterior and interior lighting.b5) Ground Network (it must be taken account the actual terrain resistivity obtained from fieldmeasurements). Calculations are not required for additions of equipment within existing land networks.b6) Voltage drop of the system by starting the main engines of the electrical system.c) A requirement of the project, applicants may request additional studies such as:c1) Coordination of protections.c2) charge flow and stability of the electrical system.c3) Ground resistivity

8.1.6 Design Validation

a.

Electrical design must comply with NOM-001-SEDE, with this NRF-048 and specific project

requirements.b.

Design validation must be performed by an electrical engineer or a related field withprofessional license and verifiable experience in the design of oil facilities.

c.

PEMEX will verify workers CV proposed and in case of meeting the requirements, will accept tohire the person in charge of the design validation.

8.1.7 Compliance Verification with NOM-001-SEDE

a. NOM-001-SEE compliance verification carried out using the Procedure for ConformityAssessment (PEC) of NOM-001-SEE Electrical Installations (Use), and must be made by a Unit

Controller for Electrical Installations (UVIE) with accreditation and approval in terms of theLFMN.b.

CSP must be applied to assess the conformity of the facilities listed in the "Agreement thatdetermines the public gathering places for test electrical installations, whether or not they aresupplied by the public electricity service in accordance with the scope of NOM andnotwithstanding that may apply ex parte to the other facilities provided therein.

The agreement determines which are considered public gathering places, including:

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b1) Regardless of connected load, the following:

- " hazardous classified areas "- "Places to supply 1 000 V or more between conductors, or 600 V or greater with respect to ground"b2) If the installed charge is greater than 20 kW:- "Industry of any kind"

c. For PEMEX project, the UVIEs must have verifiable experience in oil facilities.d. When a project only consists of design, the participation of UVIE is not required, and in this case,

their participation will be at the request of PEMEX.e.

At PEMEX request, can carry out verification for those facilities that are outside the agreementthat determines the public gathering places for test electrical installations "

f.

Contractor according to the bid basis, must include UVIE services, and deliver the informationrequired for the development of their activities, such as diagrams, physical drawings electricproject, calculation reports and other documents related to the project.

g.

PEMEX verifies the CV of the proposed worker and in case of complying with the requirements,shall proceed to accept the UVIE proposed by contractor.

h.

The UVIE must perform the verification process of the project, according to the requirements ofthe Procedure for Conformity Assessment of NOM-001-SEDE published in the Official Gazette on24 October 2006, documenting all activities, and informing them PEMEX. Generally is required inthe following:h1) Preparation of work plan.h2) Project review, drawings and Calculation report.h3) Conducting verification.h4) Development of circumstantial minutes

h5) Preparation of technical reports.h6) Attention to reports of corrections.h7) Verification Ruling Issuance.

8.2 Distribution Systems

8.2.1 Overview

a. PEMEX must define the electrical distribution system required for each project includingdeveloping, but on the industrial plants process plants commonly uses selective secondarysystem with dual feeder link and switch the voltage levels of 13 800, 4 160, 480, 220/127 V.

b.

The main electrical distribution systems to be used are:b1) Simple radial system.b2) Expanded radial systemb3) Selective primary systemb4) Ring primary system.b5) Selective secondary system.b6) Combination of them.

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c.

To design the system, decisions must be the result of an personnel safety analysis, the

importance of continuity in the production of industrial plant and equipment integrity,compliance with applicable technical regulations. The safety analysis must be based on a riskstudy.

d. Among the most important aspects are the following:d1) voltage level distribution system.d2) Charge foreseen growth and magnituded3) Technical and economical evaluation.d4) Environmental protection (i.e., taking care of noise levels, vibration, gas leaks and spills).d5) Physical location of the charges.d6) Flexibility in operation and ease of expansion.d7) operation and maintenance personnel safety.d8) features the highest charge to connect.d9) Identification of critical process charges, back up to control systems, measurement andalarm.d10) Application of current technology and component quality.d11) Determining the maximum size of sub stations and transformers.d12) The degree of automation required.d13) Distortion of the waveform by use of electronic equipment in the system.d14) level of reliability.

e. For any distribution system selected the specification of the equipment that generateswaveform distortion such as capacitors, rectifiers, inverters, uninterruptible power systems,starters, soft start, variable frequency among others) must be required, that the harmonicdistortion caused to the system, must not exceed 5 percent of factor voltage distortion,

individual harmonic not greater than 3 percent of the fundamental wave voltage and accordingto IEEE STD 519 or equivalent. In case of exceeding 5 percent requirement, Contractor mustprovide the necessary filters to comply with this requirement. When required by the bid basis,Contractor or bidder must include measurements and study of power quality, includingharmonic distortion analysis system.All electrical equipment must work without detriment to their characteristics, or involvement inits operation, with a value of voltage distortion greater than 5 percent.

8.2.2 of Selective secondary system Characteristics

The selective secondary system arrangement must be with dual feeder switch link with the voltagelevels of 4 160, 480, 220/127 V (for distribution panels and motor control centers) as shown in followingfigure. If there are charges or distribution in 13 800 V connections is also required in this voltage.

To obtain a voltage level, it is required to have electrical charges to be connected to said level.

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Figure 1 Selective secondary electrical system and manual/automatic transfer

8.3 Generation

8.3.1 Overview

a. Generator type and capacity are determined by normal operating requirements, which mustcorrespond to that indicated in the technical bid basis, including:

a1) Nominal voltagea2) Capacity.a3) Frequency.a4) Speed.a5) rated power factor.a6) Environmental conditions.

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a7) Prime-mover fuel availability

a8) Type of charge

b. The special conditions that must be considered to define the constructive characteristics ofthe generator are:b1) Number of phases.b2) Class of insulation.b3) Type of cooling.b4) Excitation Systems (rectifiers in the rotor shaft or separate).b5) Connection type.b6) Neutral connection to ground method

8.3.2 Location

a.

Synchronous generators and associated equipment must be selected according to the particularcharacteristics of the installation site and must comply with the requirements of section 445-2of NOM-001-SEDE.

b. Main characteristics of the installation site to be considered for selecting the electricalgenerator are:b1) Altitude above sea level.b2) Maximum, minimum and average temperature.b3) average rainfall.b4) Relative humidity.

b5) Atmospheric pressureb6) must be installed on non-classified area.b7) Type of foundation or anchorage.

c.

In the design of electrical installations, we recommend placing most of the equipment onnonhazardous area in order to reduce the amount of special equipment required.

8.3.3 Selection

a. Synchronous generators must be selected according to Standard parameters included in thegeneral rules NEMA MG-1 or equivalent, IEC 60034-1 and ANSI specific rules C50.10, ANSIC50.12, ANSI C50.13 and API RP 14F, or equivalent.

b.

The main parameters to be considered in the selection of a synchronous generator are asfollows:

b1) Capacity: See table 32-1 of NEMA MG-1 or equivalentb2) Speed: See table 32-2 of NEMA MG-1 or equivalent

b3) Rated voltage: See Section IV, Part 32 of NEMA MG-1, or equivalentb4) Excitation voltage: According to NEMA MG-1 or equivalent

b5) Frequency: 60 Hz

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b6) Temperature

Elevation

See table 32-3 of NEMA MG-1 or equivalent. The temperature rise

for generator coupled to gas turbines must comply with ANSIC50.14 or equivalent.

b7) Insulation System: The electrical insulation (dielectric) in the coils of both the rotorand stator must be H class.

b8) TemporarilyMaximum charge:

The generator must be capable of withstanding an overload of 1.5times its rated current, as minimum 30 sec. When the generatoroperates at normal temperatures, according to Section IV, Part32.9 of NEMA Standard MG-1 1998, or equivalent

8.3.4 Protection

a.

The minimum abnormal or fault conditions against which protection must be provided tothe generator are:

a1) Insulation failure of the rotor and stator windings.a2) Overload.a3) Over temperature of windings and bearings.a4) Over speed.a5) Excitation Loss.a6) Generator power.a7) Operation with unbalanced currents.a8) Over voltage

a9) Low frequencyb) It must be set a better protection scheme for the generator according to its capacity andtype of configuration of the distribution system which feeds them. According to IEEE C37-102 or equivalent.

8.3.5 Instrumentation

a. The measurement and control instruments, manual or automatic, allow to determine and adjustthe dynamic behavior of the generator. The capacity, type and location where the generator isinstalled, determine its level of instrumentation and control, the basic scheme must be:

a1) Generator Switch.a2) Field Switcha3) Alarm Tablea4) Voltage automatic regulator transference.a5) Generator neutral Switch

b.

Control Panel: This must have as minimum the following instrumentation and control in digitalform:b1) Frequencimeter

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b2) Voltmeter (bar and generated) with selector.

b3) Ammeter with phase selector.b4) Excitation voltmeterb5) Excitation ammeterb6) watt-hour meters.b7 Varhorimeter.b8) active power meter, and reactive power.b9) power factor meter.b10) control selector switch voltage/power factor.b11) control selector switches speed/charge.b12) Voltage manual controlb13) Meter temperatures in the stator and the generator cooling air.b14) Oil lube temperature gaugeb15) Thermocouple Selector.b16) Vibration Measurementb17) Event Logger

c.

Section of synchronization (for generators operating in parallel synchronized to a bar):c1) digital and analog Synchroscope.c2) synchronization mode selector.c3) Frequency (bus and generator).c4) Synchronization lampsc5) synchronism check relay and automatic synchronization

8.4 Electrical Distribution

The power distribution design consist of the selection of aerial and underground paths, and equipment,which provide the energy required and have the flexibility to expand and/or upgraded with minimalchanges to existing installations.

8.4.1 Aerial Lines Electrical Distribution

Whenever possible, aerial lines must be restricted within the facilities of PEMEX.

a.

Aerial distribution lines (1 to 35 kV) must comply with the provisions on Standards forConstruction of overhead and underground wiring" of the Federal Electricity Commission and itslast revision as indicated in Article 922 "Airline" of NOM-001-SEDE.

b.

The electrical design of aerial distribution system for alternating current must understand thedevelopment and analysis of:b1) Demand needs.b2) System stability and transitory behavior.b3) Selection of voltage level.

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b4) Voltage regulation and reactive power flows.

b5) Conductors selection.b6) Power loss.b7) Electromagnetic fields effect.b8) Insulation selection.b9) Connecting devices and stopping.b10) Selection of the automatic circuit breakers.b11) Protection relays.b12) Safety and ecological environment.

c.

The mechanical design must include:c1) Calculations of arrows and voltagesc2) Conductor type.c3) Separation and setup among conductors.c4) Insulator typesc5) Selection of fittings and accessories.

d.

The structural design must include:d1) Selection of the structure type.d2) Mechanical stress calculations.d3) Foundations.d4) Retained and anchors.

e. Other important aspects to consider within the design:e1) Location of the line of distribution line.e2) Right-a-way trace.e3) Soil Mechanics and topography.

e4) Structure location.e5) Access roads.e6) seismic factors.e7) environmental impact statement.

f.

The insulators must be selected based on:f1) Nominal electrical voltage.f2) Maximum mechanical charge.f3 Electrical stress (pulse of lightning, maneuver over voltage and effect of contamination on thedielectric force).Note: For sites where there is vandalism, non-ceramic type insulators shall be installed.g. The provisions of the Official Mexican Standard NOM-114-SEMARNAT must be complied with.

8.4.1.1 Aerial Line Structures

a.

Medium voltage structures are considered those that support conductors which operation isfrom 13 to 35 kV. The primary voltage lines with less than these ranges, must be built withstructures corresponding to a voltage of 13 kV.

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b.

Structure types employed must be those described on Standards for construction of

overhead and underground wiring" of the Federal Electricity Commission at its last review inchapter primary lines.c. All structures must withstand the charges specified in Section 922-86 and minimum charge

factors on table 922-93 of NOM-001-SEDE.d. Posts must be in an upright position after the conductor has been tensed.e. Exception: Unless the configuration of the structure required to withstand the tilt resulting

from the static forces.f.

The concrete posts that are embedded in high-salt-tolerant or pollution areas, must bewaterproofed with asphalt coating.

g.

The grounding conductor must be inside the pole and exits in the face of the pole on theside of transit.

h.

When the paths of two circuits are the same, separate structures for each must beconsidered.Exception: When the right of way impede the normal construction.

i.

The structures of wood, concrete and steel, must meet the test protocol approved by anaccredited laboratory, and section 110-2 of NOM-001-SEDE.

8.4.1.2 Aerial Conductors

a. The designer must consider the selection of conductors, electrical, mechanical, environmentaland economic factors.

b.

The nominal size (gauge) bare minimum of conductors used by aerial lines must be determined

according to the calculations required but not less than stated below.

c. Conductors must be normalized based on the following criteria:

c1) Nominal size (caliber) of the conductorThe nominal size of the conductor must be chosen in accordance with Table 922-10 of NOM-001-SEDE, the size in mm2 and AWG designation in parentheses.c2) Materialthe material of the conductor must be selected, according to the following:- ACSR: for all aerial lines built in normal environment.- Copper: in all lines in areas of salt contamination - industrial chemical as well as for theconnections to the medium voltage service.

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- Vibration of the installation site.

- Corrosion. High humidity, salt air and corrosive chemicals in the environment.- Wind maximum magnitude. Hurricane 241km/h (150 mph).- Classified site location.- Several conditions: Birds, rodents and insect infestation.- Offshore environment finish.As minimum the following parameters for the selection of sections must be specified:- Rated voltage.- Maximum design voltage.- Frequency.- Impulse basic level- Nominal current- Interruptive capacity- Type of construction (dead front, corrosion resistance).- Sealing system.- Temperature range in the work environment.If the sectioner has fuses, it must be considered:- Continuous nominal current- Symmetrical interruptive current.- Asymmetrical interruptive current.- X/R maximum ratio.b5) Circuit Restorers: These must be installed only on radial operation lines.Restaurateurs must be used in circuits over 100 A. For the selection operating voltage, current,nominal number of phases, interrupting capacity, value of the trip coil current to ground and the

curves of operation (phase and earth) must be considered and observe the provisions of ANSIC37.60, and C37.61 or equivalent.b6) Capacitors Bank: The selection of the power of such bank shall be determined in accordancewith the relevant study and must observe Article 460 of the NOM-001-SEDE and standards 18,824, 1036 and IEEE C37.99 or equivalent. All capacitors must be three phase, integrated bymonophasic unit of the same normalized capacity.b7) Atmospheric discharge counter: In order to keep track of operations over voltageprotections (arresters) meters must be installed in the aerial discharge chutes of those teams.b8) failure indicators: indicators must be used in automatic reset fault in the source side of eachsection or multiple disconnect, in accordance with standard C2 (NESC) IEEE, Section 16, Article161 or equivalent. The device must be selected according to the rated current of the circuit.

b9) Connectors: In the aerial distribution systems, aluminum splices must invariably usecompression connectors, and for copper, mechanical or directly braided connectors shall beused.

8.4.2 Conduit Pipe Aerial Electrical Distribution

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a.

Conduit to be used in visible overhead electric distribution facilities, hidden and visible in

interior shall be hot dip immersion steel, heavy duty thick wall, constructed according to NMX-J-534-ANCE.b. Hot dip immersion galvanized steel conduit pipe, semi heavy type thick wall, manufactured

according to NMX-J-535-ANCE, is accepted for indoor drowned in slab, in non-corrosive areas,when established in the technical bid basis.

c. Distance between aerial conduit pipes must be in accordance with Annex "A". \d. In aerial pipe supports (racks) there must allowed 20 percent of available space for future

applications, of the nominal size (diameter) greater than the occupied pipes.e.

When a support pipe (rack) contains pipes with power circuits, control and instrumentation, theorder must be accommodated with the tubes with circuits of higher voltage power at the top.

f.

Piping for motor feeders must have 1 circuit per pipe, except feeders for motorized valves,which are accepted up to 10 trifasic motors, selecting the nominal pipe size (diameter) above ofthe one obtained by consider 40 percent of the fill factor of conductors, and groupingpreferably valves of the same type of service, for example, cooling rings, foam fireproofing, andproduct.

g.

Conduit pipes nominal size (diameter) in visible overhead power distribution must be 21 mm(3/4 inch) or more.

h. To protect the conductor in the installation inside the conduit pipe, this must be completed byremoving the burrs at the ends on arrival I to junction boxes and panels installing nut andmonitor.

i. Visible conduit pipe shall have a nail type holding brackets, ofcast iron, 2 per leg as minimumwith low-speed threaded bolt clamps or U-heavy type duty galvanized steel with hex nuts.

j.

conduit seals must be installed for change of the classified area and at no more than 30 cm from

the installation equipment and connection boxes. The seal installation must include the fiberand the appropriate compound to comply with the sealing function.

k.

The path of conduit between passage or connection boxes must not have curves of more than180 degrees in total and no more than 2 turns of 90 degrees.

l.

Minimum radii of conductors, must be respected, according to NOM-001-SEDE.m.

In areas with excessive moisture accessories to drain condensate in equipment, panels,conduits and junction boxes must be included.

n.

At non-classified areas outside facilities, on equipment and piping subjected to vibration,settlement or movement, flexible metallic conduit with PVC-coated galvanized seaming withwaterproof connectors must be installed.

o. Step boxes must be installed in straight lines crossing each 40 m, max.

p.

Selection of the type of materials and equipment to be used in electrical installation must bebased on the overall project area.q.

Electrical material such as junction boxes, pipe box (condulets), couplings and other accessoriesfor channeling of Class I Division 2 areas, shall be provided for Class I Division 1 areas.

r.

Unistrut support type for exterior canalizations support is not accepteds.

Normally at the process plants most charges (motors) are located on either side of the supportpipe (rack) which is why the design of routes must consider the installation of maincanalizations on both sides of support the pipe (rack), located in the outer wings of this.

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c.

Mesh-type edge must have safety (to protect the wiring and safety of personnel ) must comply

with the IEC 61537 standard, the charges required in this standard and be placed according tothe manufacturer's instructions in their manuals. The leads, curves, slopes, cuts andintersections in this type of trays in the field will be developed according to drawings ofdistribution trays.

d. The path of the tray-like supports for conductors must have a 20 per cent of available spacealong its path.

e. Maximum distance between rungs of the ladder-type cable support for low-voltage conductorsmust be 15 cm.

f.

All support type tray system for conductors, must be formed of electrochemically compatiblematerials to form non-producing galvanic corrosion.

g.

Insulators in the conductors pass to the four cables must be used. They must be fire retardantmaterial, tested and certified, and installation in general for the passage of electric cablesthrough the wall must comply with the provisions in section 300-21 of Standard NOM-001-SEDE.

h.

Minimum clearance between trays installed in vertical arrangement, must be 30 cm and theseparation between the pan over high ceilings and beams, must be as minimum 40 cm.

i. Tray-like supports for conductors which must be supported piping or process equipment, isnot allowed.

j. Throughout its path, the tray type support shall not be exposed to high temperatures or physicaldamage or continuous leakage or intermittent steam.

k. Outside, the support elements of the tray type support systems for conductors must beconcrete and/or structural steel shapes

l.

In interior for 3 levels of trays or more, the supports must be structural steel, channel and angle

base, specifically in cable rooms, which must be from the floor to ceiling.m.

The amount of support per tray section must be defined in the detail engineering, but asminimum two supports must be installed per section.

n.

Must be place in visible places and along the path of the tray type support type for cables withsign with the following caption:

CAUTION: DO NOT USE AS A LADDER OR WALKER OR PERSONNEL SUPPORT, ITS USE IS ONLY ASMECHANICAL SUPPORT FOR ELECTRICAL POWER CONDUCTORS.

DANGER: ELECTRICAL CIRCUITS IN MEDIUM VOLTAGE

DANGER: LOW VOLTAGE ELECTRICAL CIRCUITS

o.

Conductors trays of types and materials accepted in this standard must comply with NOM-001-SEDE section 318 and the metallic must have a mechanical charge capacity type B or C (111.6Kg/m 148, 8 Kg/m) respectively and the safety factor of 2.

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p.

Reinforced PVC must comply with NOM-001-SEDE section 318 and the IEC 61537 standard

charges required in the Standard , ensuring the placement of the splice at any point betweenthe supports, whereas 1.5 m distances between supports at a test temperature of 40 C undercharge test type "I".

q. The exterior path design of the tray-like supports for conductors, the arrival at the substationsand control rooms of instruments must not be on the side that faces the process plant orhazardous area sources, the arrival to instrument control rooms, must be done underground.

r. For external path the total of conductors trays (all the path at all levels) must be provided witha lid.

8.4.3.1 Conductor tray type supports, metallic aluminum or galvanized steel

a.

The metallic trays must be constructed and approved according to NMX-J-511-ANCE.b.

The aluminum ones must be commercial alloy 6063 tempered 6 with natural finish, the steelones must be protected against corrosion by hot dip galvanized after manufacturing.

c.

Straight tray sections of 3.00 or 3.66 m must be installed, with a minimum useful slope of 54mm, assembled with metallic fittings including ensuring the rigidity of the whole system.

8.4.3.2 Reinforced fiberglass conductor tray type supports

Reinforced fiberglass conductor tray type supports must meet the following specifications:

a.

ladder type, reinforced polyester, with protection to inhibit ultraviolet degradation and resistantto the spread of flame.

b.

The tray straight sections must be 3.00 or 6.00 m in length, with minimum useful slope 101.6mm (4 inches) and tie plates assembled with polyester or glass fibers suitable for the type andprofile of the tray. The nuts and bolts for installation of the union plates must be steelencapsulated in fiberglass.

c.

Expansion connections must be installed, observing Table 6.1 of NEMA FG-1 or equivalent.d.

To ensure the mechanical protection of conductors housed in the trays, the total external pipingmust have a flat type fiberglass cover or two waters. The lid must be attached to the tray withspacers and bolts of fiberglass, in order to prove trays the ventilation space for conductors.

e. To prevent lateral movement on the tray, this one must be fixed to the supports. The securing

must be with clamps (polyurethane or equivalent) which must hold the bottom rails and these inturn, will be joined to the support with the steel screws encapsulated with fiberglass.f.

The trays and glass accessories must not be perforated.g.

Since the fiberglass trays are not electrically conductive, are not required to be grounded.

8.4.3.3 Reinforced Vinyl Poli-chloride conductor tray type supports (PVC)

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h.

Number of curves between logs and underground well logs must not accumulate more than 180

in total, including curves at 90 , horizontal and vertical deflection and shot to the visible part.i.

Motor feeder pipe must take 1 circuit per duct, except for motorized valves pipe (usually 440 Vthree-phase) in which it is accepted to accommodate up to 10 circuits, selecting the nominalpipe size (diameter ) calculated above according to Table 10.4 of Standard NOM-001-SEDE. It isrecommended to group valves of the same type of service, i.e. tank cooling rings, process valves,firefighting foam. In case of redundant services, they will be placed on a different pipe.

j. For engines with low voltage force feeder, size (gauge) 4 AWG as maximum, the controlconductors in 120 V AC must be in the same conduit. For greater section feeder, the controlconductors must be placed on separated conduit tubes.

k.

In the underground pipe with feeders for outdoor lighting circuits, are allowed to hold up tothree circuits per conduit.

l.

Three conductors of different phases, shall be installed on medium voltage circuit pipe per eachconduit tube.

m.

For additions or remodeling projects, conduit pipes at the arrival of the underground well logsmust be sealed if required in bid documentation. In new installations is not required, since theducts and logs must be watertight.

8.4.4.2 Underground duct banks. The following must be complied with:

a. The underground duct banks must be designed with a reinforced concrete force f'c = 150kg/cm2 or higher, water tightness through integral concrete additives must be guaranteed anddye integrally with red dye, as minimum in a proportion of 7.5 kg/m3 of concrete.a1) The maximum number of pipes in a duct bank must be 36, with a maximum of 20 pipes with

power circuits in operation.a2) The depth of the duct bank must be as minimum 50 cm from the top of the duct bank to thefinished floor level, in crossing streets must be a minimum of 70 cm.a3) in the duct banks where needed crosses with other type of facilities, there must be at aminimum distance of 20 cm.a4) On the underground duct banks route, 30 per cent of available pipes must be allowed.a5) The route of underground duct banks must be as short as possible between the source andthe electric charge, single trace, avoiding unnecessary logs , considering the right of way definedtogether with the other types of underground facilities, such as foundations, process piping,water, and sewage, among others. Must be designed with minimal deviations and changes inlevel between logs .

a6) The underground duct banks must have a minimum slope of 3/1000 to the logs for waterlikely filtering.b.

In substations or electricity control rooms the duct bank must always have slope towards theoutside of them.

c.

On a duct bank and electric logs with low voltage service, motor and instrumentation controlcircuit, lighting and force from 120 to 600 V c.a. must be accommodated, as long as theinsulation between all of them is of 600 V c.a.

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d.

In duct banks and logs these must be canalized independently from the electrical distribution,

the services such telephony, intercommunication and voicing, automation network and controlof video signs and control of TV closed circuit and intruders protection, control signs from 4 to20 mA or 24 V c.c., control of two wires of motorized valves, control of pushbutton system,traffic lights and sector alarms, control of hydrocarbon and fire detection systems, as well asother control systems.

e. Also, in a duct bank and independent electrical logs, the wiring must be canalized on mediumvoltage.

f.

The distance between parallel path of duct bank with medium voltage services, low voltage andcontrol must be of 75 cm at least, measured to the closest part between them.

g.

In a duct bank and underground well logs with different services of voltage allowed, the order ofaccommodation must be with the pipes of higher voltage in the lower part, lower voltage in themedium part and the available tubes in the upper part to facilitate the wiring.

8.4.4.3 Underground Electrical Logs

a. Must be designed of reinforced concrete fc=200 Kg/cm2 or bigger, they must warrant theimpermeability through additive integrals of concrete, the height of the entrance must be at 20cm over the level of the ground at least, in order to prevent flooding in the logs.

b. The covers of the well logs must be made of steel or fiberglass material for high impact (this is tobe defined on the bid basis). When using steel sheets, it must be of 7,94 mm (5/16 inches) ofthickness, covered with epoxy paint. If fiberglass is used, it must meet the following technicalcharacteristics: Fiberglass cover of 6,35 mm (1/4 inch) of thickness, with resin viniester, with

pultrusion process (continuous model), which means it must have the fiberglass mesh perfectlyintegrated and polyester veil as additional protection for UV.

c.

Well lognormal dimensions

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