65
. A
A
30A
Cables embedded
in concrete
floor
20A
A Thermostat incorporating switch fed 2.
Applying the diversity factor Table 1A
Total current rating A
First amperes A
of
52 17
10
30 1
.
Cooker circuit
A cooker with rating above 3kW must supplied its own circuit but
since unlikely that normal use every heating element will switched
on the same time, diversity factor may applied calculating the
cable size, detailed the Site Guide.753).
.
.
Consider, example, cooker with the following elements fed from a
cooker control unit incorporating 13A socket:
4 8000
1 2000
1
kW fast boiling rings W
kW grill W
kW o
oven W
Total loading 000 W
2000
12
When connected 230 V
Current rating
12000
230
52 17
.0mm PVC/copper
C Thermostat fed 2.Electrical installations and wiring systems
297
metallic grid connected the protective conductor the supply circuit
(Regulation 701.5mm PVC/copper
B switch fuse fed 4.5mm PVC/copper
Lounge Hall Bedroom
B B
C C
FIGURE 14.
% 7
7 65
5
10 65
A A
Socket outlet A
Assessed current demand
.20
Floor warming installations
