It is a requirement that a residual current device
(RCD) formerly known as an earth leakage circuit
breaker (ELCB) with a tripping current of 30mA, is
incorporated in the circuit. This may be part of the
existing consumer unit or a separate unit.
For close circuit protection DO NOT use a rewireable
fuse. Instead use a suitably rated Miniature Circuit
Breaker (MCB) or Cartridge Fuse.
Please refer to the Circuit Protection Table.
Cable Current Carrying Capacity Table
(for Twin and Earth PVC Insulated Cable)
Current Carrying Capacity
In an insulated
wall
In conduit or
trunking
Clipped direct or
buried in a non
insulated wall
6mm²
32A
6mm²
38A
6mm²
46A
10mm²
43A
10mm²
52A
10mm²
63A
Note:
Cable selection is dependant on derating factors
On installation of the appliance the impedance
measurement of the Neutral and Earth back to the supply
source is to be less than 1.0 Ohms. This is in line with the
general installation requirements of the UK Network and
will generally present no problem within the UK Network.
In domestic installations you must ensure that the
electrical supply and existing fuse board are adequately
rated.
Do not turn on the electrical supply until the plumbing
has been completed and the shower cover re-fitted.
Circuit Protection Table
Circuit Protection Device
Unit Rating (@
240V)
MCB
Cartridge Fuse
8.5kW
40A
45A
9.5kW
40/45A
45A
The current carrying capacity of the cable must be at
least that of the shower Circuit Protection Device.
Please refer to the Cable Current Carrying Capacity Table.
8
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Electrical Requirements