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Specification for Electrical Sup

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					                      RESTRICTED                      Document ID: SP-1110
                      Jun-10                                Filing Key: Business
                      Control


                   Petroleum Development Oman L.L.C.




                         Electrical Infrastructure

                       Specification for Electrical
                        Supply of Mobile Camps



         User Note:

         The requirements of this document are mandatory. Non-compliance shall only be
         authorised by the Document Owner or his Delegate through STEP-OUT approval.

         A controlled copy of the current version of this document is on PDO's EDMS. Before
         making reference to this document, it is the user's responsibility to ensure that any
         hard copy, or electronic copy, is current. For assistance, contact the Document
         Custodian or the Document Controller.

Users are encouraged to participate in the ongoing improvement of this document by providing
constructive feedback.


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Authorised For Issue May 2006




The following is a brief summary of the 4 most recent revisions to this document. Details of all
revisions prior to these are held on file by the issuing department.


Version No.      Date        Author                      Scope / Remarks
Version 2.0      May 97      BEB/4                       General Format Revision
Version 3.0      June        C.V. Raghavan,              Converted to Specification as per PDO
                 99          OIE/11                      Policy Cascade
Version 4.0      Oct.03      O. Nilsson, TTE1X           General Revision
Version 5.0      May 06      Saif Al Harthy, UIE/4       Standards list updated, minor corrections
                                                         made




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Contents

1.             Introduction ................................................................................. 6
      1.1 PURPOSE ............................................................................................. 6
      1.3 APPLICABLE STANDARDS, SPECIFICATIONS AND CODES ............. 6
               1.3.1 PDO standards .......................................................................................... 6
               1.3.2 SIOP/SIEP standards ................................................................................ 6
               1.3.3 International standards .............................................................................. 7
      1.3 COMPLIANCE WITH STANDARDS ...................................................... 7
2.             Scope ........................................................................................... 8
      2.1 DESIGN AND ENGINEERING PRINCIPLES ......................................... 8
               2.1.1    Standards, Codes and Regulations for Mobile Camps ............................. 8
               2.1.2    Operational Safety..................................................................................... 8
               2.1.3    Meteorological Conditions ......................................................................... 9
               2.1.4    Materials and Components ....................................................................... 9
      2.2 ELECTICAL SYSTEM DESIGN ........................................................... 10
               2.2.1 General ................................................................................................... 10
               2.2.2 Supply Capacity....................................................................................... 10
                     2.2.2.1 Generators ................................................................................. 11
                     2.2.2.2 Switchgear.................................................................................. 11
               2.2.3 Short Circuit Ratings ............................................................................... 11
               2.2.4 Electrical Protection and Control ............................................................. 11
                     2.2.4.1 General....................................................................................... 11
                     2.2.4.2 Generators ................................................................................. 11
                     2.2.4.3 Switchgear.................................................................................. 12
                     2.2.4.4 Cable feeders ............................................................................. 12
                     2.2.4.5 Power socket outlets forming part of the distribution system ..... 12
                     2.2.4.6 Power and convenience socket outlets ...................................... 12
               2.2.5 System Earthing ...................................................................................... 12
      2.3 DESIGN AND SELECTION REQUIREMENTS FOR EQUIPMENT AND
          CABLES .............................................................................................. 13
               2.3.1 Generators .............................................................................................. 13
               2.3.2 Switchgear ............................................................................................... 13
                     2.3.2.1 Generator and main distribution switchboard ............................. 13
                     2.3.2.2 Subdistribution switchboard (consumer units) ........................... 14
               2.3.3 Cables, Wires and Accessories .............................................................. 14
                     2.3.3.1 Earthing cables........................................................................... 14
                     2.3.3.2 Power cables .............................................................................. 14
                     2.3.3.3 Lighting and small power cables ................................................ 15
                     2.3.3.4 Cable accessories ...................................................................... 15
               2.3.4 Power and Convenience Socket Outlets and Plugs ................................ 15
                     2.3.4.1 Power socket outlets .................................................................. 15
                     2.3.4.2 Convenience socket outlets ....................................................... 15
               2.3.5 Tools and Test Equipment ...................................................................... 15
      2.4 ENGINEERING AND INSTALLATION REQUIREMENTS .................... 16
               2.4.1 Generators .............................................................................................. 16
               2.4.2 Distribution Equipment ............................................................................ 16
               2.4.3 Cabling and Wiring .................................................................................. 16
                     2.4.3.1 Sizing of cables .......................................................................... 16
                     2.4.3.2 Underground cabling .................................................................. 17
                     2.4.3.3 Above ground cables.................................................................. 18

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                   2.4.3.4 Cables and wires in conduit ....................................................... 18
             2.4.4 Electrical Installation in Mobile Units ........................................................18
             2.4.5 Electrical Installation in Tents...................................................................18
             2.4.6 Lighting Installations .................................................................................18
                   2.4.6.1 Emergency lighting..................................................................... 19
             2.4.7 Earthing and Bonding ...............................................................................19
             2.4.8 Labels - Rating and Nameplates ..............................................................20
             2.4.9 Guards ....................................................................................................20
     2.5 TESTING AND INSPECTION .............................................................. 21
             2.5.1 General ....................................................................................................21
             2.5.2 System Testing ........................................................................................21
                   2.5.2.1 Earthing ...................................................................................... 21
                   2.5.2.2 Insulation/Continuity Testing ...................................................... 21
                   2.5.2.3 Residual Current Device Testing ............................................... 21
             2.5.3 Maintenance Programme .........................................................................21
     2.6 DOCUMENTATION.............................................................................. 22


APPENDICES
APPENDIX A: GLOSSARY OF DEFINITIONS, TERMS AND ABBREVIATIONS .................23
SP USER-COMMENT FORM ........................................................................................................32




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1.            Introduction

1.1           PURPOSE
              This Specification (SP) covers the complete supply, delivery to site, installation,
              testing upon completion and putting into normal operation of the electrical installation
              of a Mobile Camp.
              This SP shall be utilised in conjunction with one or more referenced SPs and
              international standards to complete the PDO requirement for a complete installation.
              The requirements of this SP shall be adherent.
              Where cross references are made, the number of the section or sub-section
              referred to is shown in brackets.


1.3           APPLICABLE STANDARDS, SPECIFICATIONS AND CODES

1.3.1         PDO standards
              HSESM                       HSE Standards Manual
              SP 1075                     HSE Specification - Fire and Explosion Risk
                                          Management
              SP-1099                     Specification for Electrical Installation Practice
              SP-1104                     Electrical Safety Rules
              SP-1108                     Electrical Safety Operational Procedures
              SP-1105                     Electrical Standard Drawings List
              SP-1109                     Specification for Earthing and Bonding
              SP-1100                     Specification for Testing and Commissioning of electrical
                                          Equipment
              SP-1111                     Specification for Temporary Electrical Supply for
                                          Construction and Maintenance Work
              SP-1121                     Low voltage switchgear & controlgear assemblies
                                          (Ammendment supplement to DEP-33.67.01.31-Gen.
              SP-1277                     Transportable Accommodation Units



1.3.2         SIOP/SIEP standards


              DEP 33.64.10.10-Gen.        Electrical engineering guidelines
              DEP 33.67.01.31-Gen.        Low-voltage switchgear and controlgear assemblies
                                          (amendments/supplements to IEC 60439-1)
              DEP 63.10.08.11-Gen.        Field commissioning and maintenance of electrical
                                          installations and equipment




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1.3.3       International standards
            ERA Report 69-30         -    Current rating standards for distribution cables (part 3 &
                                          5)
            IEC 60245                -    Rubber Insulated Cables of Rated Voltages up to and
                                          Including 450/750V
            IEC60 309                -    Plugs, Socket-outlets        and     Couplers     for   Industrial
                                          Purposes
            IEC 60364                -    Electrical Installations of Buildings
            IEC 60439                -    Low Voltage Switchgear and Controlgear Assemblies
            IEC 60502                -    Power Cables with Extruded Insulation and Their
                                          Accessories for Rated Voltages from 1 kV up to 30 kV
            IEC 60529                -    Degrees of Protection Provided by Enclosures (IP Code)
            IEC 61140                -    Protection Against Electric Shock – Common Aspects for
                                          Installation and Equipment
            IEC 60755                -    General Requirements for Residual Current Operated
                                          Protective Devices
            IEE                      -    Regulations for electrical installations
            HD 384                   -    Electrical installations of buildings



1.3         COMPLIANCE WITH STANDARDS
            For any deviation from this SP a written agreement of the Company shall be
            obtained prior to commencing associated engineering or construction work.
            Compliance with this SP for modifications or extension work to existing facilities may
            not always be possible; in such cases the Company's written instructions shall be
            obtained to indicate whether a deviation is acceptable.




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2.            Scope

2.1           DESIGN AND ENGINEERING PRINCIPLES

2.1.1         Standards, Codes and Regulations for Mobile Camps
              The basic principles of this SP are based on DEP 33.64.10.10-Gen. and SP-1099.
              The electrical installation of mobile camps shall comply with DEP 33.64.10.10-Gen.
              and SP-1099. However, for certain aspects of the electrical installation, in particular
              cables, earthing and mobile units, deviations from the above standards are allowed
              as specified in this SP.
              All regulations constituting the law and associated regulations are obligatory when
              applying the requirements of this SP. In the event of contradiction between the
              requirements of this SP and DEP or other standards, the former shall prevail unless
              the requirements of this SP are less severe, subject to statutory obligations.
              The electrical installations of mobile units shall as a minimum, comply with IEC
              60364, HD 384 or IEE. However, all mobile units in the same camp shall be built to
              the same standard.
              All regulations and listed documents shall be of latest issue except those documents
              prescribed by date.

2.1.2         Operational Safety
              The design of electrical systems and equipment in a mobile camp shall ensure that
              all operating and maintenance activities can be performed safely and conveniently.
              The electrical system supplying mobile camps shall be maintained and operated in
              accordance with the relevant statutory regulations of the Sultanate of Oman and the
              PDO Electrical Safety Rules (SP-1104). Staff directly responsible for the
              maintenance and operation of the electrical installation of the mobile camp shall,
              within four weeks after assuming such responsibility, be nominated by the contractor
              to attend the PDO Low Voltage Electrical Safety Rules Course. Copies of this SP
              can be obtained from the CFDH, Electrical.
              The system shall be designed such that plant items can be safely isolated from
              electrical power sources during maintenance and that adjustment and testing of live
              equipment can be carried out safely.
              The insulating and dielectric materials used in all electrical equipment shall be non-
              toxic and shall not contain compounds that are persistent and hazardous
              environmental contaminants, such as poly-chlorinated biphenyls (PCBs).




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2.1.3       Meteorological Conditions
            Local conditions are severe, the climate being characterised mainly by extreme heat
            and humidity. Sandstorms are both frequent and severe, and can continue for days
            with the atmosphere becomes heavily laden with dust particles.
            Rain is infrequent but when it does occur it is often combined with hail and sand
            storms.
            Where applicable equipment shall be designed for operation in the following
            environmental conditions:-
            Maximum black bulb temperature              :        82 C
            Peak shade temperature, two hours           :        60 C
            Continuous ambient temperature              :        55 C
            Minimum average ambient temperature                  :         5 C
            Maximum daily variation in temperature               :         25 C
            Maximum relative humidity                   :        98%
            Minimum relative humidity                   :        30%
            Average barometric pressure                 :        97.7 to 98.9 kPa
            Maximum 3 second gust wind speed            :        122km/hour
            Soil thermal resistivity                    :        240 C.cm/W
            Solar radiation                             :        1209 mW/sq.cm
            Maximum ground temperature                  :        35 C @ 800 mm below grade levels
                                                                    0
                                                                 38 C @ 650 mm below grade levels
                                                                 40 C @ 500 mm below grade levels

2.1.4       Materials and Components
            All applied materials and components shall be suitable for the purpose for which
            they will be used, tropicalised, protected against corrosion and damage, and against
            the prevailing weather conditions during transit, storage, installation and operation.
            Due regard must be taken of the effect of direct sunlight on outdoor equipment and
            the effects of differential temperatures existing in the equipment due to such
            impingement.




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2.2       ELECTICAL SYSTEM DESIGN

2.2.1     General
          The design of the electrical installation shall be based on the fundamental principles
          referred to in Section 2.1. It shall be commensurate with any specific design criteria,
          philosophy or objective that may be contained in the specification for a mobile camp.
          For example, the location of the generator may be defined by noise limitations.
          The Contractor shall be responsible for the detailed design and co-ordination of all
          systems in sufficient detail to satisfy the requirements of this SP and for the safe
          operation of the mobile camp.
          The Contractor shall furnish the Company with copies of all design calculations,
          sketches, drawings and similar information that the Company may reasonably
          require.
          All Contractor design items shall be subject to the approval of the Company.
          Approvals of Contractor designs will be in principle only, and shall not relieve the
          Contractor from his responsibility for the correction of discrepancy, error or
          omissions.
          The contractor shall at least provide the following information:
          1)   A complete layout diagram, clearly showing the location of the generator units,
               distribution units and switchgear, as well as the caravans and other power
               consuming devices, with distances between each clearly shown.
          2)   A complete single line diagram (see note) to indicate at least the following:
               - All sources of electric power
               - The principle supply and distribution system interconnections
               - System capacities, equipment ratings and impedances, winding
                 configurations and earthing arrangements
               - Relevant information that basically describes the design and operating
                 philosophy to be adopted for the system e.g. arrangement of main and stand-
                 by circuits, normal switch positions, switch interlocking and circuit change-
                 over facilities etc.
          3)   All other general or detailed drawings necessary to show the full extent of the
               electrical installation, e.g. mobile unit wiring diagrams.
          NOTE: Drawings ref. 1) and 2) shall indicate cable sizes, route lengths, switchgear
                ratings, protective device ratings and other relevant data to ensure full
                documentation of the safety and operability aspects of the system.
          The PDO standard drawings STD-4-7100-001, 7100-002 and 7101-001 and 7101-
          002, forming part of this SP may serve as an example.
          Proposed installation drawings shall be submitted by the Contractor to the Company
          for review together with the tender submission.
          Final as-built drawings shall be submitted by the Contractor to the Company within
          four weeks of energisation.



2.2.2     Supply Capacity
          The firm capacity of the electricity supply and distribution system shall, in principle,
          be capable of supplying continuously 125% of the maximum expected load demand
          (after diversity).


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2.2.2.1   Generators
          The number of generators to be installed is up to the discretion of the Contractor.
          However in case of only one generator is used, the Contractor should consider the
          availability of a stand-by generator to cater for unit failures and during maintenance /
          repair periods when the aggregate maintenance/repair time warrants this.

2.2.2.2   Switchgear
          The main and sub-distribution switchboards shall have spare panels or cubicles,
          etc., for the possible future installation of additional outgoing circuits equivalent to
          approximately 10% of the number of circuits initially utilised, with a minimum of one
          circuit of each size. Switchboard ratings shall be based on electrical circuit loading
          when all spare panels and circuits are utilised to their maximum circuit rating, due
          regard given to the required switchboard diversity factors.



2.2.3     Short Circuit Ratings
          All equipment shall be capable of withstanding the effects of short circuit currents
          passing through the system and consequential voltages arising in the event of
          equipment or circuit faults.
          NOTE: Damage occurring at the fault location is excluded from the above.
          The short circuit rating of equipment and cables, including the short circuit making
          and, where relevant, breaking capacity of circuit switching devices, shall be based
          on the parallel operation of all available supplies, due regard given to the distribution
          of short circuit current and to the limiting effect of system protective devices.



2.2.4     Electrical Protection and Control

2.2.4.1   General
          The electrical system shall be equipped with reliable automatic protection which
          shall provide safeguards in the event of electric equipment failures or system mal-
          operation.
          Requirements, as specified for each circuit in the following sections, shall be
          adherent.
          Automatic protective devices shall be by means of:
          -    Fuse-switch combinations, or
          -    Moulded case circuit breakers (MCCBs) , and
          -    Residual current devices (RCDs)
          They shall be designed to achieve selective isolation of faulted equipment with
          minimum time delay. In any event, this shall be within a time corresponding to the
          short circuit current withstand capability of equipment, system stable operating limits
          and the maximum fault clearance times specified in section 2.2.4.3 and 2.2.5 of this
          SP.

2.2.4.2   Generators
          Depending on their duty, generators shall as a minimum be equipped with the
          following protection, control and metering equipment, in accordance with SP-1107:
          -      Short circuit protection
          -      Reverse power protection*
          -      Manual or automatic and check synchronising equipment*

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          -     Automatic voltage control system, suitable for island and parallel* operation
          -     Volt meters for the three line to line voltages
          -     Ammeter for each phase
          -     Frequency meter
          -     Emergency stop push button, clearly displayed at the engine
          *Only applicable when generators operate in parallel.

2.2.4.3   Switchgear
          For LV switchboards the maximum permissible operating time of circuit protection
          for a bus bar fault shall not exceed one second and shall be applicable irrespective
          of variations in the magnitude of prospective short circuit currents that may arise
          under normal operating conditions.

2.2.4.4   Cable feeders
          Armoured cable feeders for sub-distribution shall be controlled and protected by
          MCCBs. It is emphasized that the armour serves as a protective conductor (PE) and
          as such shall be earthed at both ends.
          Un-armoured cable feeders shall be additionally protected by RCDs with an
          operating current of 30 mA.

2.2.4.5   Power socket outlets forming part of the distribution system
          Each power outlet forming part of the distribution system shall be at least controlled
          and protected by an MCCB. Only plugs fitted with armoured cables may be inserted
          in these power socket outlets (refer to Section 2.3.4.1 for power sockets and outlets
          requirement)
          In case a power socket is additionally protected by a RCD with an operating current
          of 30 mA, then plugs fitted with armoured or un-armoured cable may be inserted in
          these socket outlets (2.2.4.4).



2.2.4.6   Power and convenience socket outlets
          Each power and convenience outlet circuit shall be controlled and protected by:
          -    a MCCB and a RCD with a 30 mA operating current



2.2.5     System Earthing
          The LV electrical system neutral shall be solidly earthed in the vicinity of the
          generator skid/trailer and the associated LV system shall have separate neutral and
          protective conductors, i.e. a TN-S system as defined in IEC 60364-3.
          For equipment operating at LV, earth fault loop impedance shall be such as to effect
          circuit disconnection in a time not exceeding one second under solid (negligible
          impedance) earth fault conditions.
          Reference shall also be made to SP-1109, Section 2.2.7 - Mobile Camps.




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2.3       DESIGN AND SELECTION REQUIREMENTS FOR EQUIPMENT
          AND CABLES

2.3.1     Generators
          Diesel generator units shall comprise of a skid/trailer mounted package including:
          -   Diesel prime mover
          -   LV generator complete with exciter/automatic voltage regulator
          -   Control and auxiliary services
          -   Overcurrent/earth fault protective devices
          -   Circuit breaker
          -   Earth bar
          Units shall be electrically isolated from established utility networks and shall be self
          supporting.
          When for operational reasons two generators are required and if parallel operation
          of generators is not required, then the circuit breaker or isolator switch of the
          generator which is not running shall always be locked in the 'OFF' position or
          interlocked with the other generator circuit breaker or isolator switch.

2.3.2     Switchgear
          Switching and protective devices shall be suitable for uninterrupted duties.
          For 3-phase/4-wire systems the switching devices shall be 4-pole.
          For single phase systems 2-pole switches shall be used.

2.3.2.1   Generator and main distribution switchboard
          Generator and main distribution switchboards shall comply with IEC 60439 and shall
          be suitable for outdoor use, and protected at least by a rain canopy. Enclosure
          protection as per IP 54 and IEC 60529.
          ,Non-metallic enclosed switchgear and control gear shall be considered only for sub-
          switchboards protected by LV fuses of maximum 400 A.
          Each incomer shall be provided with an 'on-off' switch. Outgoing units shall provide
          means of positive separation from the bus bar system to allow for safe circuit and
          cable maintenance or repairs.
          Incoming and outgoing switches shall either be lockable in the 'off' position, or be
          installed behind a lockable cover.
          Each generator and main distribution board shall be provided with an earth bar.
          The opening of any door of an enclosure giving access to live parts shall be possible
          only when one of the following conditions shall be fulfilled:
          1)   All live parts that may be touched after the opening of the door shall be
               protected to a degree of IP 20. It shall not be possible to remove the screen
               providing the IP 20 protection except by the use of a tool. Serviceable parts, e.g.
               fuses, shall be removable without affecting IP 20 degree of protection.
          2)   Normally live parts protected to a degree less than IP 20 shall be disconnected
               from the supply. The door giving access to these parts shall be interlocked with
               the disconnecting device in such a way that the door can only be opened with
               the disconnector in the open position. After opening the door it shall not be
               possible to close the disconnector.


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2.3.2.2   Sub-distribution switchboard (consumer units)
          These are the consumer units in mobile units and may be of three or single phase
          type.
          Sub-distribution switchboards shall have an incoming MCCB. All outgoing circuits
          shall have MCBs / MCCBs. If no RCDs with a 30 mA operating current are installed
          in the main distribution switchboard feeding the sub-distribution board, then an RCD
          with an operating current of 30 mA shall be provided in the incoming circuit or in all
          outgoing circuits of this sub-distribution board.

2.3.3     Cables, Wires and Accessories
          All cables which are likely to be frequently moved in normal use shall be flexible, of
          the heavy-duty neoprene rubber type or equivalent.
          All power, lighting and control and earthing cables shall have copper conductors and
          the minimum cross section to be used is 2.5 mm 2.

2.3.3.1   Earthing cables
          Earthing and bonding cables are normally PVC-covered, coloured yellow/green, for
          both underground and above ground use.
          Main earth and bonding cables shall have a cross-sectional area of at least 50 mm 2.
          Branch earth cables for the purpose of bonding exposed conductive parts e.g. metal
          work in toilet and shower rooms, water heaters, sewage facilities, pipes for water
          and gas etc. shall have a cross-sectional area of minimum 10 mm 2.
          However, for the purpose of bonding between mobile units, a single core copper
          conductor heavy duty flexible cable (welding type) with a cross-sectional area of
          minimum 35 mm 2 is acceptable. Both ends of these earthing and bonding cables
          shall be marked green/yellow.

2.3.3.2   Power cables
          All cables used for interconnecting from the generator/main distribution board to all
          mobile units and tents shall comply with either the requirement in Table 1 or Table 2.



            TABLE-1 CABLES WITH ARMOURING
            COMPONENT               MATERIAL
            Conductors              Stranded or flexible (multistrand) copper
            Insulation              XLPE, EPR or Elastomeric
            Armouring               Galvanised steel wire or steel braid or flexible
                                    braided
            Outer sheath            PVC or heavy duty HOFR sheath

          Note: The galvanised steel wire armouring or braiding may be serving as a
                protective conductor (PE) and shall be continuous and effectively earthed at
                both ends.




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            TABLE-2 CABLES WITHOUT ARMOURING

            COMPONENT               MATERIAL

            Conductors              Flexible (multistrand) copper

            Insulation              PVC or EPR

            Outer sheath            Heavy duty neoprene rubber, HOFR or equivalent
                                    sheath

2.3.3.3   Lighting and small power cables
          All cables used within mobile units shall be regarded as permanent systems and
          they shall comply with the requirements specified in the Table 3 below.


            TABLE-3 CABLES FOR LIGHTING & SMALL POWER
            COMPONENT               MATERIAL
            Conductors              Stranded copper
            Insulation              PVC, CSP or EPR

          The minimum cross section shall be 2.5 mm 2.

2.3.3.4   Cable accessories

          Accessories for terminating cables shall be selected as appropriate and of good
          quality. All armoured cables shall be terminated by double compression cable
          glands.

2.3.4     Power and Convenience Socket Outlets and Plugs
          Receptacles for outgoing supply shall be of the female type, and for incoming supply
          of the male type. Plugs of different rated currents or voltages shall not be
          interchangeable, so as to avoid errors in connection.

2.3.4.1   Power socket outlets
          Socket outlets shall be standardised for each rating and type throughout the
          installation and shall have an earth connection incorporated. The socket outlets shall
          comply with IEC 60309. Connections for three-phase plugs shall be made in such a
          way as to retain the same order of phases.
          The power socket outlets and plugs shall have a degree of protection of at least IP
          54, both when the plug is removed or fully inserted.

2.3.4.2   Convenience socket outlets
          Convenience socket outlets shall have a standard supply voltage equal to the
          voltage selected for normal lighting. The sockets outlets shall be rated for at least
          13 A.
          Convenience sockets shall not be installed outdoor and shall not be used for
          industrial purpose.

2.3.5     Tools and Test Equipment
          Adequate tools and test equipment as required for proper operation, maintenance
          and testing of the electrical installation shall be available at the mobile camp. Tools
          shall comply with the requirements of SP-1111.

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2.4       ENGINEERING AND INSTALLATION REQUIREMENTS
          The electrical installation shall conform with good working practice, high quality and
          safety.
          For commissioning of electrical equipment, reference is made to DEP 63.10.08.11-
          Gen.

2.4.1     Generators
          The location of the diesel generator(s) shall be governed by:
          -   Ease of access for fuel delivery
          -   Located at a minimum distance of 15 m from any structure and be fitted with
              noise protection.
          The installation shall comprise:
          -   Canopy protected, skid/trailer mounted generator set
          -   A separate bulk storage tank provided for diesel fuel
          -   Earthing of the bulk fuel storage tank (if metallic)
          -   Earthing of machine enclosure and system star point
          -   Physical protection above starter batteries and all positive terminals on the
              batteries and starter motor shrouded

2.4.2     Distribution Equipment
          The generator and main distribution boards shall be:
          -   Easily accessible without causing any obstruction
          -   Protected from damage by traffic
          -   Lockable with access restricted to authorised persons

2.4.3     Cabling and Wiring
          Cables joints is not permitted. Changes of direction in cable trenches and racks or
          trays shall cater for the minimum cable bending radii of 8 times the cable overall
          diameter.
          For cable marking purposes non-corroding strips shall be used, each securely fixed
          to the cable in indelibly imprinted text. Each cable shall be marked at both ends,
          indicating origin, destination and type of armouring.

2.4.3.1   Sizing of cables
          Sizing of cables shall take account of:
          i) The thermal short circuit capacity,
          ii) The voltage drop and
          iii) The current rating.
          The thermal short circuit rating of cables shall correspond to the clearing time of the
          associated protective device.
          The voltage drop in cables shall not be more than 5% based on continuous
          maximum current loading and rated voltage.
          Current ratings for cables and derating factors for deviating conditions shall be in
          accordance with ERA report 69-30.
          Most common deviating conditions are:
          - Deviation from ground / ambient temperature
          - Deviation from soil thermal resistivity
          - Grouping of cables instead of single cable
          - Depth of cable trench
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          As a rule of thumb, for Oman conditions, the following cable derating factors may be
          used:

             TABLE-4 CABLE DERATING: SOIL & TEMPERATURE CONDITIONS
             Derating factor for:                                PVC           XLPE, EPR           Rubber
             - Ground temperature of 40 C                       0.75            0.82                N.A
             - Soil thermal resistivity of 240 C                0.70            0.75               N.A.
             cm/W
             - Ambient air temperature of 50 C                  0.71            0.82               0.58

          NOTE:      N.A. is not applicable- Rubber shall only be used above ground (in air)


             TABLE-5 CABLE DERATING: CABLES LAID IN GROUND @ 0.5 m DEPTH
             For insulation material:               NUMBER OF CABLES IN GROUP
             PVC, XLPE or EPR                    SPACING BETWEEN CABLES: up to 70 mm
                                                2            3             4            5               6

             Derating factor                  0.81          0.7          0.64           0.6           0.57


          Example: Three XLPE cables installed in a group will have an overall derating factor
                   of 0.82*0.75*0.70 = 0.43
          The overall derating factor for cables should not be lower than 0.4 because of the
                    conditions valid in Oman.
          Therefore it is clear that no more than three cables should be laid in a group at the
                    above stated separation distance.




             TABLE-6 CABLE DERATING: CABLES INSTALLED IN AIR

             For insulation material:                  NUMBER OF CABLES IN GROUP.
             PVC, XLPE, EPR or                      SPACING BETWEEN CABLES: up to 70 mm
             Rubber
                                                    2            3          4            5              6
             Derating factor                    0.98         0.96         0.95          0.94          0.93


          Example:       Three rubber cables installed in a group will have an overall derating
                         factor of 0.58*0.96 = 0.56

          For sizing of cables the maximum sustained cable current loading consistent with
                       the nameplate rating of the equipment shall be taken into account.

2.4.3.2   Underground cabling
          Main distribution cables to and from generator/main distribution boards shall be
          buried at sufficient depth (e.g. 0.5 m), to avoid being damaged by any disturbance of
          the ground reasonably likely to occur during the period of stay of the camp.


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          If this is not possible, a means of physical protection shall be applied, e.g. conduit,
          trunking or elevation on catenaries or supports above the area.
          Underground cables shall be provided along the routing with routing markers at 25
          m intervals. In addition, routing markers shall be provided at every change of
          direction in the routing and at crossings.

                       Cables shall not be laid above ground unprotected!!!


2.4.3.3   Above ground cables
          Cables shall be installed in such a way to avoid being damaged and to minimise
          obstruction to other services. Above ground cables shall be supported by cable
          racks, trays or cable ladders all the way up to their terminations. Where necessary,
          e.g. particularly on vertical runs, the cables shall be fixed to the tray by straps.
          Individual cables however, may be fixed directly to the main structures, walls,
          ceilings or columns by means of proper fixing and supporting materials.
          Overhead cables, when crossing passages, shall be bound with yellow/black
          coloured tapes, or freely moving strips of fabric or plastic to attract attention.
          Cables within mobile units shall be installed to the same standard as is selected for
          the design and engineering of this mobile camp.

2.4.3.4   Cables and wires in conduit
          Wires in conduits are not acceptable, except for internal wiring in closed structures,
          e.g. mobile units. Cables in conduits are acceptable. No more than one cable shall
          be installed in one conduit.

2.4.4     Electrical Installations in Mobile Units
          Each mobile unit shall have its dedicated power supply via a cable from a sub or
          main distribution switchboard.
          An isolating switch (load break type) shall be mounted on the outside of the mobile
          unit.
          The isolating switch shall be weatherproof and IP 54 and have a padlock facility, to
          lock the switch in the 'off' position.
          For three phase supply to the mobile unit, the isolating switch shall be 4-pole, for
          single phase supply, the isolating switch shall be 2-pole.
          To facilitate camp moves, it is allowed to connect larger consumers (eg., window
          units) via an individual plug and socket, instead of a switched spur-unit. The
          plug/socket shall be 240 V, 2-pole and earth, and have a minimum rating of 16 A
          (the IEC standard body colour for these plug/sockets is blue).

2.4.5     Electrical Installations in Tents
          Each tent shall have its dedicated power supply via a cable from a sub or main
          distribution switchboard.
          The cable shall be terminated onto a multiway convenience socket outlet block,
          protected by a 13 A fuse. The socket outlet block shall be securely fastened onto a
          tent pole inside the tent. Lighting fixtures inside the tent shall be of an industrial type.

2.4.6     Lighting Installations
          Lightings shall be installed in all mobile units, main entrances and in all other
          structures and areas where required.


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2.4.6.1. Emergency lighting
          If no fixed emergency lighting is installed, then portable emergency lighting shall be
          provided at strategic points in the mobile camp, including mess rooms, first-aid
          rooms, main entrances and in all other structures and areas where required for
          safety reasons.
          Location and electrical arrangement shall be such that danger to personnel is
          prevented in case of a power failure., Escape routes shall be lit.
          Emergency lights shall have a facility for switching off the lamp during mobile camp
          moves.

2.4.7     Earthing and Bonding
          For the purpose of earthing of the electrical system and equipment the installation
          shall have one common earth grid connected to at least two groups of earth
          electrodes.
          The impedance to earth of this common earth grid shall be as low as practicable
          with a maximum value of 25 .
          The common earth grid shall extend throughout the installation in the form of a main
          ring. Mobile units, e.g. caravans, portacabins etc. may form part of the ring.
          Refer to PDO standard drawing STD-4-7101-001& STD-4-7101-002, included in this
          SP.
          All exposed conductive parts and extraneous conductive parts shall be connected to
          the common earth grid.
          Examples of exposed conductive parts are enclosures of electrical equipment,
          including electrical heaters and boilers.
          Examples of extraneous conductive parts are caravan or pump skids, tanks, water
          and gas pipes, tanks, skids, pump frames, metal work in toilet/shower rooms, metal
          work in kitchens, sewage facilities.
          If structural components or extraneous conductive parts are used as bonding
          conductors, e.g., skids of mobile units, their conductivity must be equivalent to the
          specified minimum cross-section for bonding conductors (5.3.1), and their continuity
          must not be interrupted by structural modifications or by the influence of mechanical,
          chemical or electrochemical factors.
          Wire guys, suspension wires, metal hoses and the like shall not be used as bonding
          conductors.
          Each generator neutral terminal shall be solidly earthed to a dedicated earthing point
          on the generator skid which shall be directly connected to a group of earth
          electrodes via an insulated stranded copper conductor having a suitably sized cross-
          sectional area to withstand the prospective fault current and fault clearance time with
          a minimum cross-section of 50 mm2.
          In general earth electrodes shall be installed to a minimum depth of 1 m. Where this
          is not possible initially, action shall be taken within one week, to ensure that the
          earth impedance shall not exceed 25  (eg by hiring portable drilling equipment).
          Earth connections in switchboards shall not depend on welding or bolted joints
          between panels or cubicles. Copper earth bars shall be provided in every case. The
          connection shall be such to avoid the possibility of the connection becoming loose.
          The earth bar in the generator distribution board shall be connected to the common
          earth grid with two earth wires each suitable for 100% duty.
          Cable armouring shall be bonded to the earth bar in the generator/main and sub-
          distribution boards.

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          Two earth studs shall be provided on diagonally opposite sides of each mobile unit.
          Cable lugs with hole suitable for a minimum 10 mm diameter size bolt shall be
          provided on both ends of each earth or bonding cable.

2.4.8     Labels - Rating and Nameplates
          Labels, nameplates, instructions and warning plates necessary for the identification
          and safe operation of the work, shall be installed.
          Incoming and outgoing units of all switchboards shall be labelled, to indicate the
          sending and receiving point of supply.
          The materials shall be non-deteriorating and non-warping under the conditions
          specified.
          All labels, nameplates, instruction and warning plates shall be securely fixed to items
          of plant and equipment. The use of adhesives is not permitted.
          Approved warning plates shall be placed in prominent positions wherever it is
          necessary to alert personnel to danger. All electrical equipment within panels shall
          be individually identified. Each electrical control panel shall have a circuit designation
          label.
          An adequate amount of danger tags shall be available at the camp, to be used when
          carrying out repairs or maintenance on the camp's electrical system.

2.4.9     Guards
          All moving parts, shafts, couplings, flywheels, bare conductors, batteries, hot or cold
          surfaces and the like shall be adequately and securely guarded.




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2.5       TESTING AND INSPECTION

2.5.1     General
          Electrical installations shall be tested both during and after erection prior to
          connection to the electrical supply, and testing procedures shall comply with the
          current IEE Regulations for Electrical Installations, unless otherwise stated.
          The electrical installation shall be tested at each re-location prior to start-up, or at
          intervals not exceeding 6 months, whichever comes first. The result of all tests shall
          be recorded and be retained at the camp for the duration of the Contract with PDO.
          The general tests required are:
          -   Visual inspection
          -   Continuity of ring final circuit conductors
          -   Continuity of protective and bonding conductors
          -   Impedance to Earth of the common earth grid
          -   Insulation resistance
          -   Polarity
          -   Loop impedance
          -   Operation of residual current devices



2.5.2     System Testing

2.5.2.1   Earthing
          It is essential that the common earth grid is tested in accordance with Section 2.5.1
          in order to ensure that the impedance to earth is not greater than 25 . The test
          procedure shall be as per manufacturers instruction of the test equipment.

2.5.2.2   Insulation/Continuity Testing
          The cable insulation resistance tests shall be carried out between phases and earth,
          between phases and phases and between phases and neutral in accordance with
          Section 2.5.1.

2.5.2.3   Residual Current Device Testing
          The residual current devices shall be subject to operational testing in accordance
          with section 2.3.1. A test procedure shall be adopted which trips the device at the
          correct level. Operation of the test button facility does not constitute a test. Refer to
          IEE Regulations for electrical installations.



2.5.3     Maintenance Programme
          The Contractor shall be responsible for developing and implementing a maintenance
          programme for the electrical equipment. Part of the programme shall be a recording
          system to show the frequency and record the results on maintenance activities.




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2.6      DOCUMENTATION
         An up to date register and dossier of all documentation relating to the electrical
         installation shall be established and maintained at the mobile camp. All drawings
         and information shall be up to date, clearly showing all alterations and revision
         dates. The available documentation shall include, but not be limited to the following:
         -    Single-line diagrams
         -    Cable trench routing
         -    Inspection and test certificates
         -    Records of alterations




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APPENDIX A: GLOSSARY OF DEFINITIONS, TERMS AND ABBREVIATIONS

The following terms and abbreviations used in this specification, are defined below:
General Terminology
  Company           -     Petroleum Development Oman LLC of Muscat, Sultanate of Oman

  Consultant        -     A party holding a Contract with the Company or Contractor and who is
                          responsible for providing design, engineering, and other related
                          consultancy services under a Contract

  Contractor        -     A party holding a Contract with the Company who is responsible for
                          the construction, commissioning and other related works specified in
                          the Contract. On occasion, a Contractor may be responsible for the
                          duties of both Consultant and Contractor

  Manufacturer -          A party responsible for the manufacture of material or equipment to
                          perform the duties specified by the Consultant, Contractor or the
                          Company

  May               -     The word 'may' is to be understood as indicating a possible course of
                          action

  Shall             -     The word 'shall' is to be understood as mandatory

  Should            -     The word 'should' is to be understood as strongly recommended

  User              -     A qualified engineer, Consultant or Contractor who applies these
                          standards in the execution of a PDO project or Contract

  Vendor/supplier-        The party responsible for the manufacture of materials, equipment or
                          products related services in accordance with the purchase order
                          issued by the Consultant, Contractor or its nominated purchasing
                          office

  Work              -     All work to be executed and all services to be rendered by the
                          Contractor under the terms of the Contract

  Worksite          The defined place designated by the Company where all Work and
                    -
                    services shall be executed by the Contractor under the Contract
Technical Terminology
  Earth-            The conducting mass of the earth, whose electric potential at any
                    point is conventionally taken as zero (IEC 60050-826)
  Earth terminal-         A terminal fitted on equipment and providing a means of (or bar or
                          stud)connection for an earth conductor (IEC 60050 Chapt. 604)
  Earth electrode-        A conductor or group of conductors in intimate contact with and
                          providing an electrical connection to earth (IEC 60050 Chapt. 604)
  Earth fault loop-       The impedance of the earth fault current loop (phase to earth
                          Impedance earth loop) starting and ending at the point of the earth
                          fault. The earth fault current loop comprises the following parts,
                          starting at the point of fault:
                          - the circuit protective conductors, and
                          - the consumer's earth terminal and earth conductor, and
                          - for TN systems, the metallic return path, and
                          - the path through the earthed neutral point of the generator and the
                            generator winding, and

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                        - the phase conductor from the generator to the point of fault
Earth impedance-        The impedance between an earthing system and earth at operating
                        frequency
Earth conductor-        A conductor of low impedance which provides an electrical connection
                        between a given point of an equipment (an installation or system) and
                        an earth electrode (IEC 60050 Chapt. 604)
Earth grid-             A form of equipotential bonding consisting of a system of
                        interconnected earth conductors and connected to earth electrodes
Equipotential-          Electrical connection putting various exposed conductive parts
                        bonding and extraneous conductive parts at a substantially equal
                        potential (IEC 60050-826)
Equipotential           A protective conductor for ensuring equipotential bonding (IEC 60050-
bonding conductor       826)
Exposed-                A conductive part which can readily be touched and which conductive
                        part is not normally live, but which may become live under fault
                        conditions (IEC 60050-441/IEC 60050-826)
Extraneous-             A conductive part not forming part of the electrical installation,
                        conductive part and liable to propagate a potential, including earth
                        potential (IEC 60050-826)
Firm capacity-          The installed capacity less the stand-by capacity
Installed capacity-     The sum of the rated powers of equipment of the same kind
                        (generators, transformers, etc.) in an electrical installation
Mobile camp-            A camp established to be moved from one work location to another
                        during the Contract period, e.g. seismic, fly camps, etc
Mobile unit-            A portacabin, caravan, trailer, skid or container
Plain cable feeder      A feeder which consists of a cable only and does not have an
-                       interconnection by means of plugs and socket outlets
Protective-             A conductor used for some protective measures against electric
                        shock for connecting any of the following parts:
                        -exposed conductive parts
                        -extraneous conductive parts
                        -main earth terminal
                        -earth electrodes
                        -earthed point of the source (IEC 60050-826)
                        Note: Protective conductors are indicated with the symbol PE
Receptacles-            A collective name for sockets and plugs
Solidly earthed-        The connection of a neutral to earth with no intentional impedance
                        inserted between the neutral and earth (Refer IEC 60050 Chapt. 601)
Spare capacity-         The difference between firm capacity and the maximum calculated
                        peak load
Stand-by capacity-      The capacity provided for the purpose of replacing that which may be
                        withdrawn from service under planned or unplanned circumstances
System-                 An arrangement of equipment for the supply of electrical power (Refer
                        IEC 60050 Chapt. 601)
To earth...-            (an equipment, an installation or a system) To effect the necessary
                        connections in order to keep a given point of an equipment, an
                        installation or a system as close as practicable to earth potential (IEC
                        60050 Chapt. 604)

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Abbreviations
 AC                 -          Alternating current
 BS                 -          British Standard
 DC                 -          Direct Current
 CSP                -          Chloro-Sulphonated Polyethylene
 DEP                -          Design and Engineering Practice (SIOP)
 EPR                -          Ethylene Propylene Rubber
 ERA                -          Electrical Research Association
 ERD                -          Engineering Reference Document (PDO)
 HD                 -          Harmonisation Document
 HOFR               -          Heat-resisting, Oil-resisting, Flame Retardant
 IEC                -          International Electrotechnical Commission
 IEE                -          The Institution of Electrical Engineers (UK)
 IP                 -          Ingress Protection
 LV                 -          Low Voltage
 MCCB               -          Moulded Case Circuit Breaker
 MCB                -          Miniature Circuit Breaker
 PDO                -          Petroleum Development Oman
 PE                 -          Protective Earth
 PVC                -          Poly-Vinyl Chloride
 RCD                -          Residual Current Device
 XLPE               -          Cross-Linked Poly Ethylene
 SP                 -          Specifications (PDO)
 PR                 -          Procedures (PDO)
 GU                 -          Guidelines (PDO)




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APPENDIX-B: STANDARD DRAWINGS

 1-   STD 4 7100 001
 2-   STD 4 7100 002
 3-   STD 4 7101 001
 4-   STD 4 7101 002




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SP USER-COMMENT FORM

SP User-Comment Form

If you find something that is incorrect, ambiguous or could be better in an SP, write your
comments and suggestions on this form. Send the form to the Document Control Section
(DCS). They make a record of your comment and send the form to the correct CFDH. The
form has spaces for your personal details. This lets DCS or the CFDH ask you about your
comments and tell you about the decision.

SP Details              Title                                                  Issue Date:
Number:

Page number:            Heading Number:                                        Figure Number:

Comments:




Suggestions:




User’s personal details
Name:                             Ref. Ind:                Signature:               Date:
                                                                                    Phone:
Document Control Section Actions
Comment Number:                   Dates                                             CFDH
                                  Recd:                    To CFDH:                 Ref. Ind:

CFDH Actions
Recd         Decision:                                               Inits:         Ref.          Date:
Date:        Reject:                                                                Ind:
             Accept, revise at next issue:
             Accept, issue temporary amendment

Comments:




Originator            Date:        Inits:        Document                         Date:          Inits:
Advised:                                         Control Section
                                                 Advised:


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