the
heater position, switch must installed terminate the fixed heater
wiring. The wiring
arrangements are shown Fig.20.19
Ducted warm air heating system.18
Possible wiring arrangements for storage heaters. The flexible cables used for the final connection the heaters must
be the heat-resistant type. When current passed through the cables they become heated,
the concrete absorbs this heat and radiates into the room. Once heated, the concrete will give
off heat for long time after the supply switched off and is, therefore,
suitable for connection off-peak supply.
Floor warming installations use the thermal storage properties concrete.
Special cables are embedded the concrete floor screed during construc-
tion.Basic Electrical Installation Work
296
The single-storage heater heated electric element embedded in
bricks and rated between and 15kW depending upon its thermal capac-
ity.5mm cable
20A switch
30A fuse consumer’s
unit connected off-peak
4. radiator this capacity must supplied its own circuit, cable
capable carrying the maximum current demand and protected fuse
or miniature circuit breaker (MCB) 30, 60A appropriate.
Underfloor heating cables installed bathrooms shower rooms must
incorporate earthed metallic sheath covered earthed
Storage
heater
Storage
heater
Storage
heater
15A fuse consumer’s
unit connected off-peak
2.0mm cable
FIGURE 14.
.0mm cable 4.
Main control and
means protection
connected off-peak
Suitable PVC-insulated
copper cable, 10mm
30, 60A
DP switch providing
means isolation
Ducting to
various rooms
High-resistant cable
Outlet grilles
High-capacity
thermal
storage
heater
FIGURE 14. 14
