Appliances Renovation
Electrical Appliance Not Always Electric, Small Appliance is a BIG Business
Storage Heater Circuits
Storage heaters require a separate circuit for each heater. This is because, unlike direct acting heaters which are switched on and off as required, storage heaters are all switched on together during the 8-hour period. They cannot therefore be supplied from a ring circuit which is based on diversity of use of various appliances; each heater must have its own circuit.
The circuit for a storage radiator consists of 2.5 mm2 2-core and earth PVC sheathed cable. The cable starts at a 20 A fuseway in the time-controlled consumer unit and terminates at a 20 A double-pole switch fixed next to the storage radiator and connected to it with 3-core flexible cord via the cord outlet of the 20 A switch.
There are circumstances where two storage heaters are supplied from a single 30 A circuit. Each heater must then be supplied through a fused outlet which is a switched 13 A fused connection unit. Such an arrangement would be limited to two heaters having loadings of not more than 3 kW to prevent possible overheating of the fused connection unit.
Storage Fan Heater Circuits
The circuits supplying the heater will be the same as those supplying storage radiators, but it is also necessary to provide a circuit for the fan.
As a fan takes very little current, small size cable as used for lighting circuits is suitable. The fan can, in fact, be supplied from a lighting circuit but rather than introduce a lighting circuit into a heating circuit it is better to feed the fan from a fused spur cable off the ring circuit. Where there is more than one storage fan heater all fans can be served by the one fused spur.
Switched Outlet at Heater
Both the heater and the fan require an isolating switch fixed near the heater to terminate the circuit cables and as a flex connection for the heater unit. As this heater will be supplied by two circuits, regulations require that the two switches are mechanically linked so that one cannot be switched off without the other.
To meet these requirements there is available a 25 A twin switch with or without pilot lights and with two cord outlets; one marked ‘Fan‘ the other marked ‘Heater‘.
Automatic control
Heat output of a fan heater can be automatically controlled by introducing a room thermostat and/or timeswitch into the fan circuit, but generally it is sufficient to control the fan manually.
Floor Warming
Electrically warmed floors are applicable only to new houses, bungalows and flats during construction. If you move into a dwelling where this type of heating is installed, seek advice from the electricity board particularly regarding off-peak tariffs and running costs.
Electricaire Heating
This is a system which directs warm air through a ducts system. It must be installed as a house is being built or being reconstructed under a home improvement scheme. The system needs a 45 A circuit from a 45 A fuseway to a control unit fixed near the unit.
Centrelec
This system is comparatively new. Before embarking on an installation it is advisable to discuss the project with the electricity board.
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