Kwaiti Naft PASH-19

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KUWAIT OIL COMP NY K.S.C.)

Engineering Group

Specification Number

075-pH- 7907Elec trical Design Ins talla tion and Testing

BYRev Clienthkd

17 JUN 94

7 M R 93

D a t e Section

ISSUED S KOC ENG GROUP SPEC

ISSUED FOR INVIT TION TO BID

Revision PE



ngineering GroupSpecification

CONTENTS

1 0 SCOPE 4

2 0 STANDA RD SPECIFICATIONS 4

3 0 SERVICE COND ITIONS 6

4 0 CLASSIFICATION OF HAZARD OUS AREAS 6

5 0 EQUIPMENT SELECTION FOR HAZ ARD OUS AREAS 7

6 0 POWERSUPPLY 7

7 0 ELECTRICALSYSTEMS 8

8.0 SUBSTATIONS 10

9 0 POWER GENERATION 1 1

1 0 0 POWER DISTRIBUTION CONTROL AND PROTECTION 1 3

11 0 M O TO R S 1 6

2 0 EARTHING SYSTEM 1 6

13 0 LIGHTING 1 8

4.0 EMERGENCY LIGHTING 20

5 0 ROAD LIGHTING 2 1

6 0 SOCKET OUTLETS 2 116 1 Hazardous Areas and Outdoor Locations 2 116 2 Unclassified Indoor Locations 2 2

6 3 Location of Socket Outlets 2 26 4 Socket Outlets Extension Leads 2 26 5 Type of Socket Outlets 2 3

7 0 COMM UNICATION SYSTEMS 23

8 0 CABLE DESIGN AN D INSTALLATION 2 3

1 9 0 C O N DU IT 2 7

0 0 J U N C TIO N B O X E S 2 8

1 0 NAMEPLATES AN D LABELS 2 8


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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 0 CATHODIC PROTECTION 29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 0 LIGHTNING PROTECTION 29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 0 ELECTRIC SURFACE HEATING 29

25 0 SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 0 PAINTING 29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 0 TESTS AT SITE 29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.1 General 30

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.2 LV Installations 30

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.3 HV Cabling 3027.4 HV Switchgear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.5 Transformers 31

27.6 LV Switchgear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

27.7 Voltage Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

27.8 Current Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.9 Protection Relay System 31

27.10 Battery Equipments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

. . . . . . . . . . . . . . . . . . . . . . . . . . .7.1 1 Motors and Generators 32

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.1 2 Illumination Levels 32

. . . . . . . . . . . . . . . . . . . . . . . . . . .7.13 Function of Equipment 32

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.14 Earthing 32

. . . . . . . . . . . . . . . . . . . .8 0 PACKING MARKING AND DOCUMENTATION 32

. . . . . . . . . . . . . .9 0 SPARE PARTS AND MAINTENANCE REQUIREMENTS 32

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1 0 SCOPE

1.1 This specification covers the design, manufacture, installation, inspection,site commissioning, testing and supply of the electrical works for installa-tion a t the Facility in Kuwait.

1.2 The electrical work installation shall full y comply wi th all relevantcontractual requirements specified in the Scope of Work and TechnicalSpecification of the Contract.

1.3 The Contractor shall employ specialist engineers as required. In particular,the Approved Manufacturer's engineers shall supervise the installation andcarry out the commissioning and testing at the Site of t he following:

1.3.1 Generator sets.

1.3.2 High-voltage switchboards.

1.3.3 Low-voltage switchboards and motor contro l centres.

1.3.4 Variable speed drive controllers.

1.3.5 Uninterruptible power supply units.

1.3.6 DC supply units.

2 0 STANDARD SPECIFICATIONS

2.1 The electrical system shall con form in design, materials and performance,except where otherw ise specified, w it h the current issue and amendmentsof th e following prevailing on the effect ive date of th e Contract:

2.1.1 lnternational Standards

IEC standards shall include those listed in the Engineering GroupSpecification entitled lnternat ional Codes and Standards (Number0 1 5-AH- 02).

2.1.2 British Standards

British Standards shall include those listed in the Engineering GroupSpecification entitled lnterna tional Codes and Standards (Number0 1 5-AH- 1 002).

2.1.3 Other Standards

KOC STD 38 1 0 7 Hazardous Area Classification: ZonalBoundaries and Requirements forContained Equipment.


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KOC STD 38 11071 1 The Completion of Hazard Assessmentsand Classification of Hazardous Areas.

institute of Model Code of Practice in the PetroleumPetroleum Industry.

2.1.4 Engineering Group Specifica tions

The electrical works installation shall conform with all relevantEngineering Group specifications of which the following arespecifically referred to in this specification:

0 1 5-AH-1 001 Basic Design Criteria

0 1 5-AH-1 0 0 2 International Codes and Standards

0 1 5-HH-1101 HVAC Equipment and Installation

0 1 5-JH-1911 Standard Auxiliary Control Room Cabinets

0 1 5-KH-1902 Spare Parts and Main tenance Requirements

0 1 5-PH-1902 High-Voltage Switchgear

0 1 5-PH-1903 Power Transformers

0 1 5-PH-1904 Generator Sets

0 1 5-PH- 1 90 5 Low-Voltage Switchgear and Moto r ControlCentres

0 1 5-PH-1906 DC Supply Units

15-PH- 1 90 7 Electrical Cables

0 1 5-PH-1908 Induction Motors

0 1 5-PH-1909 Uninterruptible Power Supply Systems

01 5-PH-1910 Cathodic Protection Transformer Rectifier Units

0 1 5-PH-1911 Variable Speed Drive Controller

0 1 5-VH-1001 Parking Mark ing and Documentation

0 1 5-WH-1006 Cathodic Protection Design Philosophy

0 1 5-XH-1005 Shop and Field Painting

0 1 5-ZH-1002 Condition Monitoring Telecommunication andSecurity System

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2.2 Compliance with this specification shall not relieve the Contractor of itsresponsibility to supply equipment suited to meet the specified serviceconditions and applicable regulations.

2.3 Where confl icts exist between this specification and other Drawings,standards, codes and specifications, the most stringent shall be applied.

2.4 Equipment may compl y wi th other National Standards subject t o receipt ofprior w rit ten approval from the Company.

2.5 Electrical components for incorporation into the installation shall complywit h th e r elevant IEC standards. These shall be selected to exclude readilycombustible insulating and constructional material and excessive heat

generation. Electrical and mechanical electrical reliability is of t he ut mos timportance. The components shall have been type tested t o the relevantIEC standards .

3 0 SERVICE CONDITIONS

3.1 The electrical installation shall be suitable for continuous operation at adesert location under high ambient temperatures and humidity. Theatmosphere at th e Facility is generally dusty and corrosive and may containtraces of hydrogen sulphide.

3.2 All materials used for electrical installation shall be new and in all respectssuitable for continuous operation in the service conditions stated inEngineering Group Specificat ion enti tled Basic Design Criteria (Number0 1 5-AH-1 001).

3.3 Equipment located inside buildings shall be rated for continuous operationthroughou t the range of specified ambient temperatures pertaining, wit hou tregard for t he air conditioning. Equipment located outdoors shall beprovided with sunshades, where required, to reduce solar gain.

3.4 Reliability o f all equipment to perfo rm continuously in the service conditionsspecified is essential. Equipment typical of t hat being supplied shall havebeen in operational use elsewhere for a minimum of 2 years. Prototype orunpro ven equipment no t having a well-established record shall no t beconsidered.

4 0 CL SSIFIC TION OF H Z RDO US RE S

The classi fication of hazardous areas is based on the requirements of th e Companydocument STD 38 1 0 7 entitled Hazardous Area Classification: Zonal Boundariesand Requirements for Contained Equipment and the Institute of Petroleum Mode l

Code of Practice in the Petroleum Industry. Part 1 5 of this code is being used foradditional guidance and clarification.


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ngineering roupSpecification

5 0 EQUIPMENT SELECTION FOR H Z RDO US RE S

5.1 Equipment suitable for installation in Zone 1 and Zone 2 hazardous areasshall be ce rtif ied fo r use in those areas by a recognised CENELEC TestingAuthor ity or other Authority approved by the Company.

5.2 Marshalling boxes, cable glands, junct ion boxes, switches, remote contro lstations and welding outl ets installed outdoors in bot h Zone 1 and Zone 2hazardous areas shall be certified Exd.

5.3 Luminaries located in Zone 1 areas shall be certified Exd. Luminaries inZone 2 areas may be of th e Exe type .

5.4 All laboratory equipment shall be certified Exd.

5.5 Materials used for bat tery rooms shall be certified for Zone 1 Gas Group IIC,Temperature Class T3.

5.6 Equipment installed shall be certifi ed as follows:

5.6.1 In Zone 1 areas Exd

5.6.2 In Zone 2 areas Exd, Exe or Exn. Requirements specified inparagraph 5.2 shall prevail in this regard.

6 0 POWER SUPPLY

6.1 The standard voltages wh ic h shall be employed are:

6.1.1 1 1 kV, 3-phase, 3-wire, neutral, low-resistance earthed,rated lightning impulse level 75-kV peak.

6.1.2 3.3-kV, 3-phase, 3-wire, neutral, solidly earthed, ra ted lightningimpulse level 40-k V peak.

6.1.3 440-V, 3-phase, 4-wire , neutral, solidly earthed.

6.1.4 250-V, 1 phase, 2-wire, neutral, solidly earthed.

6.1.5 110- V, 1 , 1-phase, 2-wire , 50Hz 0.5Hz neutral solidlyearthed UPS.

6.1.6 1 10-VDC k 10 unearthed.

6.2 Mains voltage is subject to a variation of 6 .

6.3 The standard frequency is 5 0 Hz 2.5 .

6.4 Contro l voltages for circuit breakers and motor starters shall be 110 VAC


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440 V

3.3 kV

11 kV

Engineering GroupSpecifca on

5 0 kA fo r 1 second.8 0 k A for 1 second.

25 kA for 3 seconds.

25 kA for 3 seconds.

or 1 1 0 VDC as defined n the Engineering Group specifications forswitchgear.

6.5 The Company phase sequence is n the order of Red-Blue-Yellow, which isthe opposite order of t he Kuwait national sequence. However, all equipmentshall be o f standard construction wi th phases arranged Red-Yellow-Blue andconnected within equipment in the normal phase sequence with Red-Yellow-Blue laid out fr om top t o bo ttom and left to right, wh en viewed fromthe front.

6.6 Mot or rotation shall be checked, particularly before making of f high-voltageHV) and heavy current cables. Where required, correct ion of rotation shall

be at m otor terminals and no t elsewhere i n the electrical supply.

6.7 The rated short-time withstand current of switchgear shall be as stated onth e single-line diagrams, subject t a design study and verification by theContractor.

6.8 Standard ratings shall be:

7.0 ELECTRICAL SYSTEMS

7.1 The basic powe r system configuration shall be as shown on the overallsingle-line diagram giving the minimum Company requirements. Duringdetailed design, the Contractor shall submit to th e Company for approvalits proposed equipment ratings, system voltages, faul t levels and protectionarrangements.

7.2 The Contractor shall prepare and submit to the Company for approval atabulation of estimated loads with diversity factors, an overall electricalsingle-line diagram and switchgear single-line diagrams showing the maindistribution system from the generators and/or the incoming supplyterminals throu gh to the outgoing circuits of th e low-voltage LV) system.

7.3 The system fau lt levels and impedances shall be calculated and shown onthe single-line diagrams together with the proposed standard ratings,system earthing methods and protective relays t o be used. The calculated

fault levels shall include motor contributions.

7.4 The system voltage drops shall be calculated and shown to achieve therequirements specified n section 18.0, Cable Design and Installation, o f this


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7.5 Main supply cables, generators and transformer ratings under siteconditions shall be selected wi th a 2 5% spare capacity for future use byth e Company. The circuits, cables, swi tchgear etc . supplied by th e above,shall have a continuous rating under site conditions equal to or exceedingthe supply equipment ratings.

7. 6 Al l switchboards, motor control centres and distribution boards shallincorporate a minimum of 25% spare equipped circuits of each rating ortyp e for future use by the Company.

7.7 The sys tem is normally run wi th all bus-section breakers closed.

7.8 Load centres serving plant necessary for maintaining production, or criticalfor safety or shut down shall be provided wit h dual feeders, each sized forth e 1 0 0 % plant load. This shall include the provision of duplicate circuitbreakers, cables and transformers so arranged that maintenance can becarried o ut wit hout interruption of the process operation.

7.9 Harmonic distortion on the system at each voltage level shall no t exceedthe l imits st ated in the Engineering Group Specification entitled VariableSpeed Drive Controller (Number 01 5-PH-1911). Suitable harmonicfiltration equipment shall be provided where required as a result of

calculations or Site measurements performed by the Contractor.

7.10 A standby generator set shall be provided. The standby generator set shallbe continuously rated to supply:

7.10. 1 Al l desalters and auxiliaries required for desalter operation.

7.10.2 Crude product pumps where no mechanically driven standbypump is specified; crude booster pumps and all auxiliariesrequired for crude oil transmission at a capacity of 50 % f low

10 0% head.

7.10.3 All emergency and safety devices including total emergencyswitchboard load.

7.10.4 All plant lighting and remaining HVA C systems.

7.10.5 All utilities required for operation of th e above.

7.10.6 Plus 25 % of above total load.

7.1 1 The standby generator set shall be capable of star ting the largest connectedmotor in system wit h all other loads, including the spare capacity running,while still maintaining the voltage drop within the specified limits.

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7.1 2 The s tandby genera tor se t shal l automat ica lly s tar t and t ransfer t o th e HVelect rica l sys tem wh en a l l incoming p ow er supplies fa il , in accordance w i ththe au tomat ic t ransfer scheme.

7 .13 Loads c r it i ca l fo r sa fe ty o r shu tdow n as sho wn o n the emergencyswitchboard s ingle- l ine d iagram and inc luding UPS sys tems, DC supplyuni ts , f i re water jockey pumps, contro l bui ld ing HVAC and emergencyl ight ing shall be conne cted t o an emergency swi tchboard . The emergencyswi tchboard shal l be normal ly suppl ied f rom the ma in po we r system.

7 .1 4 In the e ven t o f los s o f norm al supp ly vo lt age and s t andby supp ly vo lt age ,th e emergency swi tch boa rd shall automat ica l ly be t ransfer red t o anemergency genera tor se t, in accordance w i t h th e automa t ic t ransfer schem especif ied herein. The eme rgency generator set shall be continuo usly ratedfo r th e to ta l runn ing load connec ted to the emergency swi tchboard p lus2 5 % of t ha t to t a l load and sha ll be capab le o f s t a r ting the l a rgestc o n n e ct e d m o t o r in sys te m w i t h a l l o ther loads, inc luding the spare capaci tyrunning, whi le s t il l ma inta in ing th e vol tage drop w i th in t he speci f ied limi ts .

7 .1 5 Provis ion for autom at ic res tar t of loads connected t o th e em ergencyswitch boa rd shall be provided on a l l c i rcui ts .

7 .1 For the pu rpose of regular tes t opera tion of d iese l and gas engine- dr ivengenera tor se ts , load banks ra ted a t 4 0 % of th e genera tor capaci ty togetherw i t h associa ted swi tch gea r shal l be provided.

7.1 7 For a Facil i ty wh ere an inc om ing supply is no t available, onsi te generatorse t s sha ll be p rov ided . T w o genera to rs , each ra t ed 125 % of the to ta lFaci l ity load, shall be provided, com plete w i t h equipment for synchronis ing,para lle l opera t ion and load manageme nt . Such se ts shall be sui table forboth cont inuous para l le l opera t ion and duty p lus automat ic s tandbyopera t ion . In such cases , s tandby genera t ion i s no t required , b utemergency genera t ion shall b e provided as speci f ied above.

8 0 SUBST TIONS

8.1 Substa t ions shal l be located cent ra lly for p lant d is t r ibut ion and local t oprincipal load points . In all cases, substa t ions shall be located in areasclassif ied as non-hazardous.

8 .2 Al l subs ta t ion bui ld ings shall be des igned t o provide a clean, dus t f ree a nddry locat ion for the swi tchgear, motor contro l cent res and auxi l iaryequipment . M ain substa t ions shall have e levated f loors and cablebasem ents. Smaller substat ions, e .g., crud e pum pho use substat ion, shallhave f loors a t grade level with structural cable trenches.

8 3 Air c ondi t ioning shall be providedin accordance wi th t he Engineer ing GroupSpeci f ica t ion ent i t led HV AC Equipment and Ins ta lla t ion (Number 0 15-HH-11 0 1 ) .


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8.4 A minimum clearance of 1 m shall be provided behind all switchboards foraccess and maintenance. A minimum clearance of 2.5 m shall be providedin the fr ont of switchboards.

8.5 A t the ends of all switchboards, space shall be allowed for t w o extensionpanels at each end plus at least 1 m t o th e nearest wall or other equipment.

8.6 Cable trayslladder racks shall be provided above or below the floor or instructural concrete trenches for incoming and outgoing cables and inter-panel connections, as appropriate for the me thod of cable routing for thebuilding.

9 0 POWER GENERATION

9.1 For details of generator set performance and construction, reference shouldbe made to the Engineering Group Specifica tion entitled Generator Sets(Number 01 5-PH-1904).

9.2 All commissioning and testing at the Site, including the provision of anytesting equipment, shall be provided by the generator set ApprovedManufacturer.

9.3 Both emergency and standby generator sets shall be available for immediatestartup o n receipt of an automatically or manually initiated contro l signal.

9.4 Each set shall be provided with a starting control mode selector switchlocated on the generator contro l panel located adjacent to the generator set.The control modes shall be OfflAutomaticIManuallTest.

9.4.1 Automatic Start

a. Wi th the automatic start cont rol mode selected, failure of theincoming supply or bo th supplies in the case of a switchboardhaving dual feeders shall automatica lly star t the generator set.When running, the set shall be automatically connected toswitchboard busbars t o supply loads. Should there be t w ogenerator sets connec ted t o the switchboard, bot h shall start,automatically synchronise and share the load.

b. Connection of a generator set t o th e busbars after a busbarfault shall be inhibited. Parallel operation of the generator wi ththe incoming power supply shall be prevented.

c. A test facility shall be provided t o simulate the normal under-voltage automatic start-up signal. The switc hboa rd incoming

supply circuit breaker(s) shall open and the automatic start andrun procedure shall be completed.


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9.4.2 Manual Start

a. Wi th the manual start mode selected the generator set shallstart by operation of the manual start pushbutton on thegenerator control panel.

b. Should there be a pre-existing loss of power a t this stage orshould a loss of power occur after the manual start of thegenerator set the automatic connect ion procedure describedabove shall proceed.

9.4.3 Test Start

a. Wit h the test mode selected starting and stopping of thegenerating set shall be by manual operation of th e appropriatepushbuttons on the generator cont rol panel. Automatictransfer of the generator to th e switch board shall n ot occur inthis mode.

b. The test mode shall be used for engine exercising and test-running operations.

9.4.4 Restorat ion of Normal Power

a. The restoration of normal power shall be detected andannunciated both at the generator control panel and at thecentral control room.

b. The transfer of the load back to the normal supply shall beautomatically initiated with additional manual transfer facil-ities.

c. After transfer of load back t o the normal supply the shut downof the generator set shall be manually initiated.

9.4.5 Parallel Operation and Synchronising

a. All generator sets shall be suitable for parallel operation andshall have adjustable droop controls for both power andreactive load sharing.

b As indicated on the single-line diagram when generating setsoperate in parallel after automatic or manual starting theincoming generators shall automatically synchronise withrunning generators.

c. For synchronising automatic and manual cont rol of thegenerator voltage and frequency shall be possible from thegenerator control panel. All automatic synchronising shall be


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backed up with check synchronising, which shall alsosupervise manual synchronisingoperations. Automatic/manualsynchronising selector swi tches shall be provided.

10 0 POWER DISTRIBUTION CONTROL AN D PROTECTION

10.1 The proposed powe r distribution system is sho wn on the single-linediagram(s).

10.2 Power transfo rmers shall comply wi th the Engineering Group Specificationentitled Power Transformers (Number 01 5-PH-1903) and shall be locatedoutdoor s in transfo rmer bays adjacent t o the substation. Where sunshadesare no t inco rporated int o the substation construction, separate transformer

sunshades shall be provided.

10.3 High-voltage switchgear shall comply with the Engineering GroupSpecification entitled High-Voltage Switchgear (Number 0 1 5-PH-1902).The switchgear and motor control centres shall be located in an air-conditioned main substation.

10. 4 Low-voltage switchgear and motor control centres shall comply wi th theEngineering Group Specification entitled Low-Voltage Switchgear andMot or Control Centres (Number 0 1 5-PH-1905). The main switchgear andmotor cont rol centres shall be located in an air-conditioned main substation.

10.5 DC supply units providing 110-VDC power for switchgear control andindication or for powerin g rotating plant auxiliaries shall comply w it h t heEngineering Group Specification entitled DC Supply Units (Number 0 1 5

PH- 1 906).

10 .6 For details of any other DC supplies, reference shall be made t o theEngineering Group specifications dealing w it h instrumentation.

10.7 The DC supply unit s shall be located in air-conditioned substations. Thebatteries shall be located in a separate batte ry room in the substation.

10 .8 The uninterrupt ible pow er supply system for the DCS, ESD and fire and gassystems, shall comply wi th the Engineering Group Specification entitled

Uninterruptible Power Supply System (Number 0 1 5-PH-1909). The uni tshall be located in an air-conditioned room in the control building wit h thebatteries i n a separate battery room.

10.9 Variable speed drive controllers shall comply wi th the Engineering GroupSpecif ication entitled Variable Speed Drive Controller (Number 0 1 5-PH-1 91 1 . The units shall be installed in an air-conditioned substat ion located

adjacent to t he dr iven equipment, if possible.

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10.10.1 All motors shall be provided with a control station locatedadjacent t o the motor, consisting of:

a. Start pushbutton, green, shrouded type.

b. Stop pushbutton, red mushroom-head, stay-put type,padlockable in the stopped position.

c. Local/off/remote selector s wit ch where specified on theP&ID drawings.

d. Ammeter for all drives 5 kW or greater rating.

10.1 0.2 A local powe r and con trol supply isolator shall be provided atall motor-operated valves.

10.10.3 Control stations shall have a minimum degree of protection ofIP55.

10.1 1 Protection Relays

10.1 1.1 Electronic/static relays shall be used, where possible, exceptfor motors of 3 0 kW or less, which shall have conventionalrelays as specified in the Engineering Group Specification

entitled Low-Voltage Switchgear and Mot or Control Centres(Number 01 5-PH-1905).

10.1 1.2 All prot ecti ve relays, except for motor thermal overload type(motors 30 k or less only), shall be flush mounted inswitchgear panels and shall comply with IEC 255.

10.1 1.3 All relays shall have hand reset contacts. Auxiliary supplyvoltage shall be 1 1 0 VDC for all relays, except 44 0 motorcont rol which shall be 1 1 0 VAC. Separate flags or indicationshall be provided for each function .

10.1 1.4 Generator differential protect ion relays, transformer differentialprotection relays and restricted earth fault relays shall all behigh impedance, circulating-current type, stabilised for throughfault current and immune to DC offset of fault current ortransformer inrush current.

10.1 1.5 Moto r stalling relays shall have the necessary ambienttemperature compensation to operate satisfactorily at thespecified service conditions.

10.1 1.6 Inverse definite mean time lag (IDMTL) overcurrent relays,non-directional and directional, shall be inverse or very inverse


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Engineering GroupSpea fication

type as suited for the application and shall have adjustablecurrent setting range and time multiplier setting range. Three-pole IDMTL overcurrent relays shall be provided for phasefaults.

10.1 1.7 lnstantaneous overcurrent relays shall be used for short circuitprotection. The relays shall have high drop-of f to pick-upratio, low transient overreach, high thermal rating and beimmune to DC offsets . Three-pole instantaneous overcurrentrelays shall be provided fo r phase faults.

10.1 1.8 lnstantaneous undervoltage relays, w it h adjustable range andhigh drop-off t o pick-up ratio, shall be provided for monitoringall th e three phases, for th e loss of mains supply. These

undervoltage relays shall be used with suitable time delayrelays for automatic transfer initiation. Tripping of high-voltage motors shall be by separate time delayed busbarconnected undervoltage relays. lnstantaneous rated voltagerelays shall be provided for monitoring all three phases forrestoration of mains supply.

10.1 1.9 All undervoltage relay circu it fuses shall be coloured red.

10.1 1.10 Frequency relays shall have continuously adjustable rangesfrom 47.0 t o 52.0 Hz, wit h cont inuously adjustable pick-up to

drop-off differential from 0 t o 1.0 Hz. The relays shall becomplete w it h t he necessary provision t o prevent inadvertentoperation due to harmonics.

10.1 1.1 1 Auxiliary relays shall be flush typ e w it h flag or LE indicationand hand-reset contact s. Auxili ary relays wit h inscriptionsshall be provided where required such as Buchholz alarm andtrip, winding temperatureloil temperature alarm, trip, and inter-trip receive.

10.1 1 12 High-speed, high-burden lockout relays with cut-off contact,

hand-reset ty pe shall be provided fo r trippingllockout functionsfor each HV circuit breakerlstarter and LV circuit breaker.Tw o normally open and t w o normally closed volt-free contactsshall be wired to a terminal block for future use.

10.12 Relay Interface Cabinets

10.12.1 Relay cabinets for interfacing between the DCS and ESDcontrol systems and the electrical switchgear and the motorand starters shall be located in th e substations.

10.1 2.2 The relay cabinets are described in the Engineering GroupSpecification entitled Standard Auxiliary Control RoomCabinets (Number 01 5-JH-1911).


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O ngineering roupSpecification

10.13 Switchgear Control

10.13.1 Motors shall be operated from the control station local t o themotor, and where specified on the P&ID drawings, by aremote con trol facility.

10.13.2 Low-voltage switchgear (non-motor circuits) shall be operatedfrom the fr ont o f the switchgear, or in the case of theemergency switchboard incoming circuit breakers, from theemergency generator control panel.

10.13.3 High-voltage switchgear (non-motor circuits) shall be operatedfr om a cont rol panel in the main substation. Switchgear

control panels shall comply with the Engineering GroupSpecification entitled High-Voltage Switchgear (Number0 1 5-PH-1902).

10.14 Alarm Annunciators and Indications

10.14.1 Substation alarm annunciator panels shall display alarmsindividually fro m each transformer, statuslalar m signals foreach incoming or bus section circuit breaker for eachswitchboard and status of remote supply circuit breakerswhe n located in Company substations. All other switchgear

alarms shall be annunciated, bu t these may be grouped foreach switchboard busbar section.

10.14.2 Where specified remote outputs shall be provided for DCSsystems or Condition Monitoring Systems. All transducersshall give 4 2 0 mA outputs with loop power from the remote(e.g., DCS) end.

11 0 MOTORS

Motor s shall comply wi th the Engineering Group Specification entitled InductionMotors (Number 0 1 5-PH-1908).

12 0 EARTHING SYSTEM

12.1 Earthing shall be provided t o p rotect personnel against electric shock andequipment against damage arising from earth fault currents, static dischargeand lightning.

12.2 A n earthing ring of 1 20-mm2 uninsulated, stranded, copper cable shall belaid around the Facility as show n on the layout Drawings, the ring shall be

earthed using earth electrodes. The main substation local ring shall be 300-mm 2 uninsulated copper cable.


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HV equipment

LV equipmentMajor non-electrical items

Transformer star points

Minor equipment

Engineering GroupSpeci fication

70 mm2

35 mm235/70 mm2

Varies see layo ut Drawings)

6mm2/1 6mm2

12.3 Al l main steel structures, vessels, tanks, pipe supports, electrical equipmentand transformer star point s shall be bonded t o th e earth ring.

12.4 Steel structures, vessels, tanks, and other major items of th e plant shallhave a minimum of t w o connections to t he earth ring.

12.5 Branch connections t o the ring shall have a minimum size as foll ows b utshall be sized such tha t the voltage t o earth does no t exceed 5 0 V whencarrying the maximum earth fault current.

12.6 Fences and gates shall be bonded for continu ity and earthed at localelectrodes.

12.7 Earth electrodes shall be 16-m m diameter extendable typ e of solid copper

or copper-clad steel construction driven directly into the ground to aminimum depth of 3.5 m wi thou t excavation or drilling.

12.8 The connections fr om earth electrodes to the earthing ring cable shall bemade in a concrete inspection pit with cover, using bolted clamps.

12.9 A sufficient number of earth electrodes spaced at no more tha n 5 0 m apartand no less than the length of the buried electrode shall be driven toachieve resistance t o the general mass of earth of not more than ohms,or any lesser resistance required t o operate the electrical p rotection.

12.10 All metallic equipment which comes in contact with any electricalequipment circui t or device shall be earthed.

12.1 1 The shells of all steel tanks shall be earthed and pipelines electricallybonded to the tanks t o which they connect.

12.12 Buried earth conductors shall be run 60 0 m m minimum belowfinished grade.

12.13 Earth busbars of tinned copper and minimum size 5 0 m m x 6 mm

shall be located above grade in substations and other locations toprovide means of isolation from the ring and to terminate branchconnections as necessary.


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12.14 All joints i n the buried earth system except ont o equipment or earthbusbars shall be by the thermite we lding process.

12.15 Connections to aboveground equipment and earth busbars shall beby crim p-type lugs and bolted connections.

12.1 6 Al l bolted connections shall be protect ed against corrosion bywrapping wi th grease-impregnated tape.

12.17 Earthing cables emerging fr om t he ground shall be protect ed againstmechanical damage by steel pipes up t o 15 0 m m above grade level.The pipes shall be sealed wi th a non-set ting non-flammablecompound.

12.18 Cable lead sheath and armour shall be earthed through the cablegland or joint t o the earthed equipment at b oth ends. Reliance on thecable lead sheath and armouring as the sole earth shall not beacceptable. Single-core cables shall only be earthed at th e supplyend.

1 2.1 9 Al l earthing conductors installed aboveground shall be PVC sheathedcoloured green and yellow.

13.0 LIGHTING

13.1 Lighting illumination levels shall be in accordance wi th t he following list.The values are for average illumination.

13.1.1 Buildings

a. Substation equipment 20 0 Lux at floorrooms battery and levelgenerator rooms and utilitiesbuildings

b. Control rooms buildings 50 0 Lux at 0.85 mand offices above floor level

c. Workshops 3 0 0 Lux at 0.85 mabove floor level

d. Laboratories 5 00 Lux at 0.85 mabove floor level

e. Substation cable basements 5 0 Lux at grade

and transformer bays level


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ngineering GroupSpecifiction

13.2.2 Outdoor Areas

a. General process areas 5 0 Lux at gradelevel

b. Under pipeways wi th pumps) 75 Lux 0.85 mand pump stations above floor level

c. Operating and access 5 0 Lux atplatforms plat form level

d. Compressor and pump houses 20 0 Lux 0.85 mabove floor level

e. General areas 3 0 Lux at gradelevel

f. Walkways and access 5 0 Lux at gradelevel

g. Gauge glasses 1 0 0 Lux at Gauge

h. Local cont rol panels 300 Lux 0.85 mand instrument panels above floor level

I Roadways To BS 5489, Part2, Category 2

j Perimeter fence 2 0 Lux at gradelevel

k. Tankage area 5 0 Lux at gradelevel

13.2 Lighting shall comprise internal lighting of buildings, process plant lighting,area floodlighting, perimeter fence and road lighting.

13.3 Lighting in buildings shall be by fluorescent luminaries or, where mountingheights exceed 3.5 m, by high-pressure sodium SON) unless otherwisespecified) hig h bay luminaries. Outdoors, local ligh ting at pumps, valvesand gauge glasses shall be by fluorescent luminaries; otherwise, in openareas and around the perimeter, lighting shall be by SON unless otherwisespecified) flood l ighting luminaries mounted on high process structures, piperack suppor ts or galvanized steel floodlighting poles. The perimeter fenceSON unless otherwise specified) floodlights shall be mounted on 5 m high

posts.

13 .4 The control room lighting shall use lo w glare fluorescent luminaries wi thelectronic cont rol gear together w it h dimming facilities in selected areas to


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ensure tha t t he cont rol panel displays and VDU screens can be viewed byoperators without glare, reflections or eyestrain.

13.5 All ou tdoor luminaries shall be provided wi th readily available safe meansof personnel access for maintenance purposes. Such access shall comprisefixed access plat forms w it h permanent ladders. Floodlighting poles shall be1 2 m hig h and have permanent fixed access.

13.6 Lighting distribu tion boards shall be 3 pole and neutral configu ration wit han incoming isolator. Lighting distribution boards for outdoor li ghting shallbe photoelectric cell contactor controlled. An override test facility shall beprovided. Distribution boards for local plant lighting shall be located in theplan t area, distribution boards for perimeter, road and area light ing shall be

located in th e substations. Distribution boards shall have at least 25spare circuits w it h a minimum of t w o spare circuits.

13 .7 Lighting circuits shall be single phase. Maximum loading for each circuitshall be 80 0 wat ts for indoor lighting and 20 00 wa tts for outdoor lighting.Distribution board circui t breakers shall be double pole for all lighting circuitsother t han circuit s inside unclassified areas, where single pole circuitbreakers shall be used.

13.8 Lighting in cont rol panel areas shall be arranged to minimise shadows andglare on contr ol panel faces.

13. 9 Measures shall be taken to avoid stroboscopic effects.

14.0 EMERGEN Y LIGHTING

14.1 Emergency lighting in all process or utili ty plant areas shall be providedconsistent with the requirements of plant operating and personnel safetyneeds under failure conditions of the normal supply and standby supply andshall be approximately 20 of the tota l plant or area lighting. Theperimeter fence lighting shall be entirely fed fr om the emergency supply.

14.2 The emergency lighting shall be supplied from emergency lightingdistribution boards fed from the emergency supply.

14 .3 Selected fluorescent luminaires, which illuminate escape routes, emergencyexits and ladders, access routes, control room, generator buildings,substations, etc. shall have individual integral battery inverter devices andshall be put into service upon normal power supply failure. Theseluminaires shall provide illumination for a minimum period of 3 0 minutesusing th e norma l lighting fluorescent tubes. The illumination provided shallbe adequate for personnel safety and escape.

14 .4 These luminaires shall be supplied from the emergency lighting distribut ionboards.

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1 5 0 ROAD LIGHTING

15.1 Road light ing shall be provided for all internal plant roadways, car parks,etc. and shall comply with the requirements of BS 5489.

15.2 The road lighting shall be supplied from suitably located contactor-switched distribution boards under the control of photoelectric cells.

15.3 The road lighting lanterns shall be of the side-entry type employingfluorescent or high-pressuresodium lamps unless otherwise specified) wi thintegral con tro l gear, m oun ted on 6-m-high galvanised steel columns. Fusecontrols shall be located in the base compartment. Alternative lanterns andcon tro l gear, suitably cer tified, shall be used in hazardous areas.

1 6 0 SOCKET OUTLETS

16 1 Hazardous Areas and Outdoor Locations

16.1.1 Socket Outlets for Welding

Welding socket outlets shall be provided throughout th e plantfor w elding purposes during shutdow n periods. They shall beof the switched, interlocked type, rated for 4 40 V, 50 Hz, 63A, 3 phase, neutral and earth connections wit h an IEC 30 9

colour and pin and configuration and shall be certified Exd. Amatching p lug shall be provided for each socket outlet. Eachoutle t shall be on a separate circuit.

16.1.2 General-Purpose 250 -V Socket Outlets

General-purpose socket outlets shall be provided in all outsidelocations. The socket outlets shall be of the switched,interlocked type, rated for 2 50 V, 5 0 Hz, 1 6 A, double poleand earth connections with an IEC 309 colour and pinconf igura tion and certi fied Exd. A matching plug shall beprovided for each socket outlet.

16.1.3 50- V Portable Socket Outlet Units

a. Each unit shall comprise a 20 0 VA, 2 50 V l5 0 V trans-former with an earthed screen and centre tap, con-nected to a switched interlocked type outlet rated for5 0 V, 1 6 A, double pole and earth connections wi th anIEC 30 9 colour and pin configuration. The mains leadshall be 15 m long, have a meta l screen armour and be

fitte d wi th a plug to match the general-purposecertified25 0-V socket outlets. The uni t case shall have mainslead stowage.


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KOngineering GroupSpecification

b. The un it shall be certi fied Exd for use in a Zone 1 area.Ten units wit h tw en ty 5 0 V matching plugs shall beprovided at each Facility.

16.1.4 250-V socket outlets shall be supplied from small powerdistribution boards wit h outgoing circuits incorporating 2- polecircu it breakers each wi th a 30-mA earth leakage protectiontrip provision.

16.1.5 Socket outlets in laboratories shall be certified Exd for a Zone1 hazardous area rated for 25 0 V 5 0 Hz 1 6 A wi th doublepole and earth connections and IEC 309 colour and pinconfiguration and be the switched interlocked type. A

matching plug shall be provided for each socket outlet.

16 2 Unclassified Indoor Locations

16.2.1 General-Purpose Socket Outle ts

a. 250-V single-phase surface-mounted 13A. switchedsocket outlets t o BS 1 36 3 shall be provided in all build-ings. A plug shall be provided for each socket outlet.

b. Socket outlets shall be supplied from small power

distribution boards wit h outgoing ring circuits having amaximum of six sockets per circuit and incorporatingsingle-pole circuit breakers wit h a 30 -mA earth leakagetrip facility.

16.2.2 Transformer Bay Socket Outlets

A socket outlet shall be provided in every alternatetransformer bay for supplying power to an oil filtration unit.The socket outlets shall be of the switched interlocked typerated for 44 0 V 5 0 Hz 6 3 A wi th 3-phase neutral and earthconnections. They shall comply with IEC 309 and have aminimum IP55 degree of p rotec tion. Tw o match ing plugs shallbe provided for each Site.

16 3 Location of Socket Outlets

Socket outlets shall be located throughout the process areas and otherareas for the use of instruments tools inspection lamps etc.

16 4 Socket Outlets Extension Leads

In process areas and equipment rooms the number of socket outletsprovided shall be such that the extension lead lengths given below shallprovide full coverage over the plant:


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16.4.1 440-V outlets: maximum 30-m extension leads.

16.4.2 250-V outlets: maximum 15-m extension leads.

16 5 Tvpe o f Socket Outlets

All socket outlets shall be suitable for the area in whic h they are locatedand consistency of colour code and p in arrangement be uniform in eacharea for each category of outlet. IEC or BS standards shall apply.

17 0 COMMUNICATION SYSTEMS

The communication systems shall be in accordance w it h th e Engineering GroupSpecification entitled Condition Monitoring, Telecommunications and SecuritySystem (Number 01 5-ZH-1002).

18 0 CABLE DESIGN AND INSTALLATION

18.1 Cables shall be direct buried, installed in structura l trenches or run overheadon suppor ts as indicated on the cable routing drawings . Cables shallcomply w i th the Engineering Group Specification entitled Electrical Cables(Number 01 5-PH-1907).

18.2 Cables hav ing any part of their length buried shall have lead alloy sheaths.

18.3 During motor starting, the voltage a t the motor terminals shall no t fall below85 of th e rated voltage. In addition, when starting any motor, thevoltage at any switchboard busbars shall not fall below 90 of t he ratedvoltage. Cables and systems shall be sized to meet these criteria.

18.4 The basis of voltage drop calcuations shall be for wors t case, i.e., minimumfault level and outage of supply feeders or transformers.

18.5 The mi nimum conductor sizes for cables shall be as follows:

18.5.1 3.3-kV and 1 1 kV grade cables:35 mm2.

18.5.2 60011 000 V grade cables:

Motors 4 mm2.

Power feeders - 4 mm2.

Lighting and small power, buried - 4 mm2.

Lighting and small power, above grade 2.5 mm2.

Control - 2.5 mm2.


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18.6 Max imu m continuous current ratings shall be derived from IEC 287, BS7671, or the cable rating tables produced by the Electrical ResearchAssociation. Due account shall be taken of th e grouping of cables, site soilcondition data, soil temperature, depth o f laying belowground and methodof laying belowgroun d or when i n air, ambient temperature.

18.7 Voltage drops in th e systems under full-load conditions shall not exceed thefollowing:

18.7.1 Feeders t o area substations: 1 %.

18.7.2 Feeders fr om area substations: 1 %.

18.7.3 Final moto r circuits: 5%.

18.7.4 Lighting circuits: 2 %.

18.8 Cables shall be sized t o meet both the voltage drop criteria and the shortcircuit condition for a time determined fro m the maximum protective relaysetting plus operating time and the circuit breaker operating time.

18.9 Cables used for the ESD and the fire and gas systems shall have a fire-resistant construction as stated in the Engineering Group Specificationentitled Electrical Cables (Number 0 1 5-PH-1907).

18.10 Control cables shall have a minimum of 20% spare cores over theoriginal design requirements.

18.1 1 Cables buried belowground shall be installed as follows:

18.1 1.1 Structural concrete trenches shall be provided in paved areas.The cables shall be laid on and also covered by 7 5 m m layersof clean sand. The trench shall be backfilled to grade level.The cable trench in-situ concrete surface cover shall becoloured red and have clean edges t o clearly define t he cabletrench.

18.1 1.2 In unpaved areas, the cables shall be directly buried inexcavated trenches. Cables shall be laid on and also coveredby 7 5 m m ayers of clean sand and then concrete cable covers100 mm above the cables. The cable covers shall overlap thecables on the extreme outside. The trench shall be backfilledt o grade level.

18.1 1.3 Cable depth to top of grade or paving shall be:

a. Systems up to 1 kV: 75 0 m m minimum

b. Systems above 1 kV: 10 00 m m minimum


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Power ables

Up to 125 V

Above 125 V and up to 25 0 Vl50A

Above 250 V and up to 4 40 V l200 A

Above 440 V and up to 11 kVl8 00A

Min Distance

2 5 0 m m

400 mm

500 mm

7 5 0 m m

ngineering roupSpeciication

18.1 1.4 Cables of different voltage levels shall be segregated fromeach other when i n the same trench. Communications cablesshall be separated by a minimum of 1 m f ro m H V cables.

18.1 1.5 No instrument cables shall be installed in power cabletrenches. Power cable routes running alongside instrumentcable routes shall be separated from t hem as follows:

18.1 1.6 Where HV cables are laid in the same trench as LV cables,there shall be a minimum spacing of 3 00 m m between HVcables and the LV cables. A minimum spacing of 150 mmshall be maintained betw een HV cables.

18.1 1.7 Where single-core cables are used, the y shall be run in a trefoil

group using proprietary cleats t o support the cables. Thecleats shall be spaced as recommended by th e Approved cableManufacturer.

18.1 1.8 Cables shall be spaced at a minimum of 5 00 mm from otherservices, e.g., pipes.

18.1 1.9 Where cables enter buildings, pass under roads, bunds andsimilar obstructions, the y shall be installed in 150-mm ducts.A t each duct bank, 2 0 spare ducts shall be provided, wi tha minimum of t w o spare ducts for future use. All duct ends,including spare ducts, shall be sealed wi th suitable sealant.

18.1 1 10 Voltage grade separation shall be maintained when installingcables in ducts. No duct shall have more tha n 4 0 of itscross-sectional area filled.

18.1 1.1 Where cables surface fr om belowground, they shall beprotected by substantial metal pipes which shall extend from15 0 m m below ground level to a minimum of 15 0 mm aboveground level to provide mechanical protection for cables.

Pipes shall be sized t o have 60 of area unused.

1 8.1 1 12 Route markers shall be provided to identify all trenches notdirectly visible at grade. Wherever possible, markers shall be

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located directly over the ce ntre line of th e trench, or,alternatively, suitably marked and located nearby. Inside theFacility where vertical posts would cause interference withpedestrians or traffic, cable markers shall be cast horizontallyin concrete at grade level. Markers shall be installed every 30m, at changes of direct ion and where cables enter buildings.

1 8.1 1.1 3 Reservations dedicated t o cable trenches shall have aminimum of 10 0 spare wi dth capacity available over theknown requirement.

18.1 1 14 Non-corrodibleplastic cable markers w it h preprinted charactersshall be fixed to both buried and surface run cables at both

ends and every 25 m along th e route. The number on eachcable shall correspond to the number allocated to the cableschedule.

18 .1 2 Cables under raised substation floors shall be laid on heavy-duty, hot-dip galvanised steel cable rack or tray suspended from the floor inth e clear space between the floor and grade.

18 .1 3 Cables under suspended floors in buildings, e.g., con trol room, shallbe laid on heavy-duty, hot-dip galvanised cable rack or tray, installedin th e underfloor void and supported fro m th e subfloor.

18.14 Cables in structural concrete trenches in buildings shall be laid onheavy-duty, hot-dip galvanised cable rack or tray f ixed t o the trenchfloo r or walls. Trenches in building shall have removable chequerplate covers.

18.15 Cables above ground shall be installed as follows:

18.15.1 Where cables are run above grade, they shall be securely fixedt o suitably supported, heavy-duty, hot-dip galvanised steelcable racks or trays.

18.1 5.2 Single cables may be individually attach ed to structures, bu tshall not be supported or attached to personnel laddersattached t o structures.

18.1 5.3 Cable racks and trays shall be attached to steel-supportingstructures of buildings, platforms, pipeways or purposeprovided support steelwork. They shall not be supported fr omprocess piping.

18.1 5.4 All cable racks and trays installed in open locations shall befitted with ventilated sunshades to prevent overheating bydirect sunlight. Suitable care shall be take n no t t o obstructfree ventilation of cables.


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O ngineering GroupSpewZcation

18.16 Cable terminations shall comply wi th the following:

18.16.1 All conductor terminations shall be by means ofcompression-type cable lugs, except co ntro l circuits and othersmall wiring wh ich shall be wired t o readily accessible clamp-ty pe terminal blocks using pin crimps.

18.16.2 HV cables shall be terminated using heat-shrinkabletermination kits Raychem or Company-approved equivalent)wi th glands in air terminal boxes.

18.1 6.3 Cables shall be terminated using brass compression glands,incorporating an internal armour clamp and a seal o n the outer

and inner sheaths, as appropriate. In the interests ofstandardisation, all glands shall be Exd cer tified for use in aZone 1 hazardous area. All glands shall be fit ted wi th PCPshrouds.

18.1 6.4 A t every HV and main IV feeder and motor cable termination,a minimum 2-m-long cable loop shall be provided to allow forfuture reconnections.

18.16.5 Phase sequence of cable cores shall be checked prior t otermination.

18.16.6 Where 1 -kV multicore cables are connected to overheadlines, heat-shrinkable cable termination ki ts suitable for th eenvironment shall be used.

18.1 6.7 All cables shall be adequately supported t o ensure tha t nostrain is placed on the termination.

18 .16 .8 Each terminal and connected wire or cable core shall bemarked and identified with suitable plastic-type ferrules, n

accordance wit h th e relevant wiring diagram.

18.17 Cables shall be installed without through joints unless otherwiseapproved b y the Company. Cold pour epoxy resin jointing kits shallbe used for 100 0-V grade cable underground oints. Heat-shrinkablejoint kits shall be used for 3.3-kV and I 1 kV cables.

19.0 CONDUIT

The use of con dui t shall be limited to electrical services installations in buildingsin unclassified areas. Conduit and fittings shall have a minimum size o f 20-mm

nominal outside diameter OD) and shall be hot-dipped galvanised steel to BS4568.


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20.0 JUNCTION BOXES

20.1 Junc tion boxes shall be provided adjacent t o luminaries and other locationswhere cables need to be joined. They shall be of galvanised cast iron orstainless steel, have a minim um degree of prot ecti on of IP55 and besuitable for the area classification where they are located.

20.2 Terminals shall be provided suitable for th e size of conductors t o beterminated.

20.3 Terminal blocks shall be arranged to facilitate accessibility for cable corestermination and inspection of terminal identification numbers. Terminalsshall be of the pinch-plate type, Exe type of Klippon manufacture or

Company-approved equivalent, suitable for a minimum conductor size of2.5 mm2.

20.4 No more tha n one wire shall be inserted into any one terminal. Loopingbetween terminals, when required, shall be carried out using the purpose-made top of block cross connection or comb-type busbar.

20.5 Adequate space for wi ring shall be provided betw een any terminal face andthe gland entry.

20.6 Internal and external earthing stud s) shall be provided.

21.0 N MEPL TES ND L BELS

21 I Each item of manufactured equipment shall have a nameplate clearly andindelibly marked with the data specified in the appropriate IEC standard.Nameplates shall be fixed with non-corrodible screws or rivets.

21.2 Warning labels shall be provided in all locations where necessary to war npersonnel of potentially dangerous situations.

21.3 Al l push butt on stations, instruments, selector switches, indicators, junctionboxes and distribution board, etc. shall be provided with descriptiveidentification labels giving reference and function.

21. 4 Labels shall have black characters on a white background, except warninglabels shall have whit e characters o n a red background.

21.5 Al l labels shall be engraved on plastic-laminated sandwich material andsecured wi th non-corrodible screws; adhesive or self-tapping screws areunacceptable.

21.6 Each distribution board shall be provided wi th a circuit directory.


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ngineering GroupSpecifiction

2 2 0 C AT H O D I C P R O TE C TIO N

Cathodic pro tection of tank bases, underground piping and other structuralsteelwork underground shall be provided as defined in the Engineering GroupSpecification entitled Cathodic Protection Design Requirements (Number 01 5-WH-1006).

2 3 0 LIGHTNING PROTECTION

Lightning protection shall be provided on all structures in accordance wi th t herecommendations of BS 6651. Lightning do w n conductors shall be connecteddirectly t o earth electrodes.

2 4 0 ELECTRIC SURFACE HEATING

Electric surface or trace heating shall be provided on piping or vessels wheresho wn in the P&ID1s and piping isometric drawings. The materials and installationshall comply fully w it h BS 6351, Electric Surface Heating. The cable shall be self-limiting current type. The circuits shall be thermostatically controlled wherenecessary. The installation shall be suitable for the hazardous area classif icationof th e area where t is located. Earth leakage protec tion shall be provided on allsub-circuits located in hazardous areas.

2 5 0 S A FE T Y

25.1 The Contractor shall be responsible for th e provision of miscellaneous itemsand equipment for the safe operation, maintenance and protection of theelectrical systems and personnel.

25. 2 The materials shall include the following:

25.2.1 Electrical danger notices on the outside of all substations,swi tch and transformer yards.

25.2.2 Electric shock treatment notices.

25.2 .3 Rubber mats.

25.2.4 Special tools for equipment operation and maintenance.

2 6 0 PA IN T IN G

Painting shall be i n accordance wi th the Engineering Group Specification entitledShop and Field Painting (Number 0 1 5-XH-1005).

2 7 0 T E ST S AT S IT E

This section shall be read in conjunction with Contract requirements for FacilityCompletion and Acceptance i n the Scope of Work and Technical Specification ofthe Contract.


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Sheet

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27 1 General

27 1 I The tes ts a t S ite described here in are a m inimum, and theContrac tor shal l car ry out a l l tes ts necessary to provecompl iance w i t h t he Engineer ing Group speci f ica t ions .

27 1 2 The check ing and t e s ts cover the mechan ica l comple t ion andcommiss ion ing checks and t e s t s w hich sha ll be ca r r ied ou t o nelec t rica l sys tem s be fore the y are p ut in to service .

27 1 3 A s a guide , mechanica l com plet ion checks shal l es tabl ish th a tth e ins ta l la t ion w ork has been done co r rec t ly and the commis -s ion ing checks and t e s t s a re t o e s tab l ish th a t th e sys tems a re

in a ready to energise condi t ion .27 1 4 Test ing programm es for com miss ioning shal l be prepared for

a l l e lec t r ica l sys tems and shal l require approval by theCompany.

27 1 5 Electrical system s shall as far as p ractica ble be ful ly assem bledbefore s tar t ing f ina l e lec t r ica l tes t ing and comm iss ioning.

27 1 6 The Contrac tor shal l provide a l l tes t equipment and isresponsible for i ts cal ibrat ion and accuracy.

27 1 7 Al l t e s t r e su l t s sha l l comply wi th the r equ i rement s o f theEngineering Group spec if icat ions a nd shall be app rove d beforeany e lec t r ica l equipment i s connected up and energised foruse.

27 1 8 All Si te tes t resul ts shal l be recorded o n tes t reco rd sheets foreach equipm ent i tem, circ uit or device. Each shall becounters igned b y the Com pany.

27 1 9 The fo rmat o f the t e s t r ecord shee t s sha l l be sub jec t toCompany approval .

2 7 2 LV Installations

All low-vol tage ins ta l la t ions shal l be tes ted in a c c o r d a n c e w i t h t h erequirements o f BS 767 IEE wirin g regulat ions) .

27.3 HV Cabling

27 3 1 High-vol tage cables shal l be subjec ted to a vol tage tes t as

defined i n IEC 502 Clause 18

27 3 2 Cables connec ted to swi tchgea r, t r ans fo rmers and motor sshall be d isconnected prior t o d ie lec t r ic tes ts . I f th is is no t


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ngineering roupSpedfication

practicable, a reduced test voltage may be used subject t oCompany approval.

27 4 H V Switchgear

High-voltage switchg ear shall be subjected to a voltage tes t as defined inIEC 694, Table 1. ( 80 of th e values specified shall be used.)

27 5 Transformers

27.5.1 Transformers shall be subjected t o tests as defined in IEC 76,Part 3, Clause 8.

27.5.2 Samples of oil fr om each transformer shall be tested t o IEC296 and 422.

27 6 LV Switchgear

Low-vol tage switchgear shall be subjected t o tests as defined in S 5486,Part 1, Clause 8.2.2.

2 7 7 Voltage Transformers

Voltage transformers shall be subjected to tests as defined in BS 3941,

Clause 18.3.

2 7 8 Current Transformers

Current transformers shall be subjected to tests as defined in BS 3938,Clause 2.6.

2 7 9 Protection Relav Svstem

27.9.1 Primary and secondary injection tests shall be carried out onall protection systems t o prov e th e calibration of all relays andth e operation of the protection circuits.

27.9.2 Protective relay calibration shall be checked at minimum,maximum and design settings and for a range of operatingcurrents.

2 7 1 0 Batterv Equipments

All equipment units containing batteries shall be subjected to batterydischarge and recharge tests t o prove the duration time of bot h functions

comply w it h th e appropriate specification. The ability of th e batteries t osupply th e required loads after loss of mains power shall also b e proved.


015-PH-1901

Rev

1

Date

17-6-94

Sheet

3 of 3 2




27 .1 1 Motors and Generators

27.1 1 I All machine windings and th e heaters shall be given continuityand insulation resistance tests.

27.1 1.2 Generators and H V moto rs shall be subjected t o a dielectrictests at 8 0 % o f the wo rks voltage test values.

27.1 1.3 Generators shall be tested t o provide data for open-circuit andshort circuit curves, verificat ion of all AVR functions and fullload rejection together wi th AVR response measurements.

27.12 Illumination Levels

lllumination levels shall be measured in all areas to prove compliance wi ththe specified illumination levels.

27 .1 3 Function of Equipment

27.13.1 All equipment and systems shall undergo full functional testingt o p rove correct operation.

27.13.2 This shall include the proving of operation of all controls,interlocks, indications, and each individual protective device in

all con trol circuits, prior to main power c ircu it energisation.

27.14 Earthing

In addition to th e earthing tests specified by BS 7671, the earthing systemshall be tested t o establish the overall resistance of the system to earth.

28.0 PACKING MARKING AND DOCUMENTATION

28.1 For all relevant requirements, refer t o th e Engineering Group Specificat ionentitled Packing, Marking and Documentat ion (Number 0 1 5-UH-1001).

29.0 SPARE PARTS AND MAINTENANCE REQUIREMENTS

29.1 For all relevant requirements, refer to the Engineering Group Specificationentitled Spare Parts and Maintenance Requirements (Number 0 1 5-KH-1902).


015 PH 1901

Rev Date

17 6 94

Sheet

3 of 3

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