8
ELECTRICAL CONNECTIONS
The electrical installation must be carried out by a qualified electrician to the current IEE wiring
regulations (BS 7671)
Wiring consists of a switch fuse or magnetic circuit breaker of 63 amp rating adjacent to the supply
companies meter. 25mm2 colour coded tails should be provided to allow the electricity supplier to make
the connection to the meter.
The boiler supply cable should comply with the current IEE regulations with regard to length; load carried
and should be run from the switch fuse or MCB to an isolator with two pole disconnection and a minimum
contact separation of 3mm, adjacent to the boiler.
From the local isolator to the boiler a cable should be run in conduit, the same size as was used to bring the
supply from the switch fuse or MCB.
WARNING
:-
THIS APPLIANCE MUST BE EARTHED, & FITTED WITH AN EARTH
LEAKAGE
CIRCUIT BREAKER.
Wiring of the circulating pump, programmer/room thermostat must be wired on the 24hr supply (no
connection to the boiler) and follows normal domestic practice. The relevant manufacturer instructions
should be adhered to.
Diagram 3 Schematic Diagram of Boiler Power Supply (Single Supply)
