Page 67 - B8773-AEW-XX-XX-PP-A-0001_[P4]_Contractors Manual
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D R A F T


          4.2.3 Removal of Existing Installations
          The Contractor shall strip out and dispose of any     considered for re-use where it is in good condition
          existing redundant electrical installations.   This   and complies fully with the requirements of the
          should  normally  include  everything,  back  to      project and the current IEE regulations.
          the  meter.  Existing  equipment  should  only  be


          4.2.4 Mains Distribution

          •  Liaise   with   the    electrical   distribution       the distribution board cover.
             company,  as  necessary,  to  confirm  or          •  Clearly  indicate  in  typed  script,  circuit
             determine  that the  main supply head fuse             identification  number,  cable  size,  circuit
             is rated at 100 amps, if single phase. Advise          breaker rating and a description of the item
             DPG if this is not the case.                           and area supplied by the circuit.
          •  Except in exceptional circumstances, DPG           •  Note that the Air Conditioning and Coldroom
             will normally have arranged for any existing           circuits MUST utilise Type 3 breakers to cope
             single phase incoming supply and/or meter              with start loads.
             to  be  upgraded  to  a  3-phase  supply  and      •  Carry  out  the  installation  of  an  earthing
             meter.                                                 system  in  accordance  with  BS7671  and
          •  Wherever a 3-phase meter is installed, then            BS7430.
             the  shop  installation  MUST  be  arranged  to    •  Provide  a  main  earth  bar  at  the  incoming
             take balanced loads from all 3 phases.                 service position, together with a clean earth
          •  Supply  and  install  a  new  MCB  distribution        bar for computer circuits.
             board. This shall be suitably sized to meet the    •  Ensure that all items of fixed metal equipment
             requirements of the installation and allowing          are correctly earth bonded.
             25%  spare  capacity  within  the  board  for      •  Ensure that the phases are correctly
             future expansion or alteration.                        balanced.
          •  Normally,  install  the  board  adjacent  to
             the  incoming  main  and  metering,  unless
             otherwise agreed in specific circumstances.        Wiring Installation
          •  Install  the  board  so  that  any  covers/doors   •  Final circuit wiring shall be carried out using
             may be opened on their hinges and do not               concealed  BASEC  certified  flat  cabling  to
             have to be lifted off to gain full access. In          BS6004 or LSZH to BS7211.
             accordance  with  Amendment  No.  3:2015.          •  Ensure  that  all  cables  are  fixed  at  least
             of 17th Ed IEE Regs.                                   200mm from hot water pipes.
          •  Identify  every  out-going  way  with  a
             renewable  circuit  chart  in  a  transparent
             plastic  envelope  permanently  fitted  inside








          4.2.3 - 4.2.4              Removal of Existing Installations and Mains Distribution  3 February 2016
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