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3.7 If point 3.6, 1 and 2 are not achievable, the installation is not
straight forward, since it could involve installing a new
consumer unit to serve the whole house or just the Multipoint
Instantaneous. You will need to call in your Regional Electricity
Company to check the circuit and make the connections to
the meter or service connector block. They should also check the
earth bonding of items in the vicinity.
3.8 A residual current device (rcd), formerly known as an earth
leakage circuit breaker (elcb), with a tripping current of 30mA
must be incorporated in the circuit.
3.9 A double-pole isolating switch (rated at 30A for 7kW, 40A for
9kW, and 50A for 12kW), with a contact separation of at least
3mm in each pole, must be incorporated in the circuit. This must
have a mechanical indicator showing when the contacts are
open. An indicator lamp alone is not sufficient. Only cord
operated switches can be fitted in bathrooms.
Double pole isolating switch:
pull cord or wall mounted in accordance
with IEE regulations
RCD (can be part of the
consumer unit)
80A or 100A main switch
Consumer unit
Figure 4
8
Multipoint Instantaneous unit
(use rear entry when it is
possible)
Meter
Meter 'tails'
Figure 5 - Rear cable entry
Make cut-out
using sharp knife
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