The installation and maintenance adequate and appro-
priate protective measures vital part the safe use electrical energy.
I want look protection against electric shock both basic and fault
protection, protection equipotential bonding and automatic discon-
nection the supply, and protection against excess current.
Shock protection protection from
electric shock provided basic
protection and fault protection.
Basic protection provided the
insulation live parts accord-
ance with Section 416 the IEE
Regulations.
Let first define some the words will using.
.Basic Electrical Installation Work
234
Protecting electrical equipment, circuits and people
We know from the earlier chapters this book that using electricity one
of the causes accidents the workplace.
Circuit protective conductor (CPC) protective conductor connecting
exposed conductive parts equipment the main earthing terminal.3 6.
Basic protection provided the insulation live parts accordance
with Section 416 the IEE Regulations.
Shock protection protection from electric shock provided basic pro-
tection and fault protection.
Fault protection provided protective equipotential bonding and
automatic disconnection the supply (by fuse miniature circuit
breaker, MCB) accordance with IEE Regulations 411. Whose electrical potential is
taken zero. Therefore,
the provision protective devices electrical installation fundamen-
tal the whole concept the safe use electricity buildings.
Bonding the linking together the
exposed extraneous metal parts of
an electrical installation.
Circuit protective conductor (CPC) a
protective conductor connecting
exposed conductive parts equip-
ment the main earthing terminal.
Fault protection provided pro-
tective equipotential bonding and
automatic disconnection the sup-
ply (by fuse miniature circuit
breaker, MCB) accordance with IEE
Regulations 411. Whose electrical potential is
taken zero.
Definitions
Earth the conductive mass the
earth. The elec-
trical installation whole must protected against overload short
circuit and the people using the building must protected against the risk
of shock, fire other risks arising from their own misuse the installation
or from fault.
Bonding conductor protective
conductor providing equipotential
bonding. gives the following definitions:
Earth the conductive mass the earth.
Earthing the act connecting the exposed conductive parts instal-
lation the main protective earthing terminal the installation.3 6. They not
form part the electrical installation but may introduce potential, gen-
erally earth potential, the electrical installation.
Extraneous conductive parts the
structural steelwork building and
other service pipes such gas, water,
radiators and sinks. Chapter the IEE
Regulations describes the earthing arrangements for electrical installa-
tion.
Exposed conductive parts the met-
alwork electrical appliance or
the trunking and conduit elec-
trical system which can touched
because they are not normally live,
but which may become live under
fault conditions.
Extraneous conductive parts the structural steelwork building and
other service pipes such gas, water, radiators and sinks.
This the green and yellow insulated conductor twin and earth cable.
Exposed conductive parts the metalwork electrical appliance or
the trunking and conduit electrical system which can touched
because they are not normally live, but which may become live under fault
conditions.
Earthing the act connecting the
exposed conductive parts instal-
lation the main protective earthing
terminal the installation. Using electricity hazard
because has the ‘potential’ and the possibility cause harm.
Bonding the linking together the exposed extraneous metal parts of
an electrical installation.
Bonding conductor protective conductor providing equipotential
bonding
