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4.2.3 Removal of Existing Installations considered for re-use where it is in good condition
and complies fully with the requirements of the
The Contractor shall strip out and dispose of any project and the current IEE regulations.
existing redundant electrical installations. This
should normally include everything, back to
the meter. Existing equipment should only be
4.2.4 Mains Distribution the distribution board cover.
• Clearly indicate in typed script, circuit
• Liaise with the electrical distribution
company, as necessary, to confirm or identification number, cable size, circuit
determine that the main supply head fuse breaker rating and a description of the item
is rated at 100 amps, if single phase. Advise and area supplied by the circuit.
DPG if this is not the case. • Note that the Air Conditioning and Coldroom
circuits MUST utilise Type 3 breakers to cope
• Except in exceptional circumstances, DPG with start loads.
will normally have arranged for any existing • Carry out the installation of an earthing
single phase incoming supply and/or meter system in accordance with BS7671 and
to be upgraded to a 3-phase supply and BS7430.
meter. • Provide a main earth bar at the incoming
service position, together with a clean earth
• Wherever a 3-phase meter is installed, then bar for computer circuits.
the shop installation MUST be arranged to • Ensure that all items of fixed metal equipment
take balanced loads from all 3 phases. are correctly earth bonded.
• Ensure that the phases are correctly
• Supply and install a new MCB distribution balanced.
board. This shall be suitably sized to meet the
requirements of the installation and allowing Wiring Installation
25% spare capacity within the board for • Final circuit wiring shall be carried out using
future expansion or alteration.
concealed BASEC certified flat cabling to
• Normally, install the board adjacent to BS6004 or LSZH to BS7211.
the incoming main and metering, unless • Ensure that all cables are fixed at least
otherwise agreed in specific circumstances. 200mm from hot water pipes.
• Install the board so that any covers/doors
may be opened on their hinges and do not
have to be lifted off to gain full access. In
accordance with Amendment No. 1: 2011.
of 17th Ed IEE Regs.
• 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
