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Protective Multiple Earthing Supply (TN-C-S system): showing earthing and bonding arrangements
.Electrical installations and wiring systems
283
regulations and therefore cannot used for public supplies. The loop-in method uni-
versally employed with conduit installations when access from above
Main switch
Main protective
earthing
terminal
L L
Label Safety electrical
connection (do not remove)
Label Safety
electrical connection
(do not remove)
10mm2
100A
10mm2
Water
service
pipe
Electricity supply Gas
service
pipe
Gas meter
Metal gas
pipe
Lights,
cooker
water
heating
CPC
Socket
outlets
25mm2 tails
kwh
30mA
RCD
16mm2
Protective equipotential
bonding conductors
FIGURE 14. This means that
for domestic lighting circuit rated 5A, maximum lighting outlets
could connected each circuit.0 1.
Wiring and lighting circuits
Table Appendix the Site Guide deals with the assumed current
demand points, and states that for lighting outlets should assume a
current equivalent minimum 100W per lampholder. Their use is
restricted private generating plants.5mm cable using either a
loop-in joint-box method installation.
Lighting circuits are usually wired 1. this way the whole installation not plunged into darkness if
one lighting circuit fuses and complies with Regulation 314. practice, usual divide the fixed
lighting outlets into convenient number circuits seven eight out-
lets each. For this reason shall not include
them here but they can seen Part the IEE Regulations.1 which tells us
to ‘divide into circuits minimize inconvenience and avoid danger’
