7.6.6.Basic Electrical Installation Work
284
or below prohibited after installation, the case with some indus-
trial installations blocks flats.1.3). this method the only joints are the
switches lighting points, the live conductors being looped from switch
to switch and the neutrals from one lighting point another.1.
The live conductors must broken the switch position order to
comply with the polarity regulations 612.1. Lampholders suspended
from flexible cords must capable suspending the mass the lumi-
naire fixed the lampholder (Regulation 559.
100mA RCD
Consumer unit with
insulated enclosure
Main protective
earthing
terminal
Electricity
supply
(usually
overhead)
L L
Label Safety electrical connection
(do not remove)
Label Safety
electrical connection
(do not remove)
10mm2
100A
10mm2
Water
service
pipe
Earth rod
Gas
service
pipe
Gas meter
Metal
gas
pipe
Lights,
cooker
water
heating
CPC
Socket
outlets
25mm2 tails
30mA
RCD
16mm2
kwh
Protective equipotential
bonding conductors
FIGURE 14.3).5).6.
The use junction boxes with fixed brass terminals the method often
adopted domestic installations, since the joint boxes can made acces-
sible but are out site the loft area and under floorboards.3
No Supply Earth Provided (TT systems): showing earthing and bonding arrangements
.2 and 559. However,
every connection must remain accessible for inspection, testing and main-
tenance (Regulation 526. ceiling rose may only be
connected installations operating 250V maximum and must only
accommodate one flexible cord unless specially designed take more
than one (Regulations 559
