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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
