The minimum permitted size 6mm2
but the cross-section need not exceed 25mm2
(IEE Regulation 544.3.2).Basic electrical circuits and cables
133
Protective equipotential bonding
Where earthed electrical equipment may come into contact with the metal-
work other services, they too must effectively connected the main
protective earthing terminal the installation (IEE Regulation 411.2).
The bonding clamp must fitted the consumer’s side the gas meter
between the outlet union, before any branch pipework but within 600mm
of the meter 544.
.
Other services are described as:
● main water pipes
● main gas pipes
● other service pipes and ducting
● central heating and air conditioning systems
● exposed metal parts the building structure
● lightning protective conductors
Protective equipotential bonding should made gas and water ser-
vices their point entry into the building, shown Fig.1.3.3 6.
Definition
Fault protection protection against
electric shock under single fault con-
ditions and provided protective
equipotential bonding and automatic
disconnection the supply (by a
fuse MCB) accordance with IEE
Regulations 411.
Definition
Basic protection protection against
electric shock under fault free condi-
tions and provided insulating
live parts accordance with section
416 the IEE Regulations.1.7, using
insulated bonding conductors not less than half the cross-section the
incoming main earthing conductor.7
Protective equipotential bonding gas and water supplies.
Try This
Memory Aid
Writing out important definitions helps you remember them.1.
Safety label
Safety
label
Bonding
clamp
Bonding
clamp 600mm
max
16mm2
Main protective
earthing
terminal
Meter
10mm2
10 mm2
Water
supply
Gas
supply
FIGURE 6.
Definition
Protective equipotential bonding is
equipotential bonding for the pur-
pose safety. 6
