8
Electrical Requirements
cont.
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.
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.
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.
Circuit Protection Table
Circuit Protection Device
Unit Rating (@ 240V)
MCB
Cartridge Fuse
8.5kW
40A
45A
9.5kW
40/45A
45A
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
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