3 6. 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.3 6.
Definitions
Earth the conductive mass the
earth. Using electricity hazard
because has the ‘potential’ and the possibility cause harm.
Circuit protective conductor (CPC) a
protective conductor connecting
exposed conductive parts equip-
ment the main earthing terminal.
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.
Let first define some the words will using.
Earthing the act connecting the exposed conductive parts instal-
lation the main protective earthing terminal the installation.
Extraneous conductive parts the structural steelwork building and
other service pipes such gas, water, radiators and sinks. gives the following definitions:
Earth the conductive mass the earth. Therefore,
the provision protective devices electrical installation fundamen-
tal the whole concept the safe use electricity buildings. Chapter the IEE
Regulations describes the earthing arrangements for electrical installa-
tion. Whose electrical potential is
taken zero.
Bonding the linking together the
exposed extraneous metal parts of
an electrical installation.
Circuit protective conductor (CPC) protective conductor connecting
exposed conductive parts equipment the main earthing terminal.
This the green and yellow insulated conductor twin and earth cable.
Extraneous conductive parts the
structural steelwork building and
other service pipes such gas, water,
radiators and sinks.
Bonding conductor protective
conductor providing equipotential
bonding.
Fault protection provided pro-
tective equipotential bonding and
automatic disconnection the sup-
ply (by fuse miniature circuit
breaker, MCB) accordance with IEE
Regulations 411.
Basic protection provided the insulation live parts accordance
with Section 416 the IEE Regulations.
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.
Basic protection provided the
insulation live parts accord-
ance with Section 416 the IEE
Regulations.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.
Shock protection protection from
electric shock provided basic
protection and fault protection.
Earthing the act connecting the
exposed conductive parts instal-
lation the main protective earthing
terminal the installation.
Shock protection protection from electric shock provided basic pro-
tection and fault protection.
.
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.
Fault protection provided protective equipotential bonding and
automatic disconnection the supply (by fuse miniature circuit
breaker, MCB) accordance with IEE Regulations 411. They not
form part the electrical installation but may introduce potential, gen-
erally earth potential, the electrical installation. Whose electrical potential is
taken zero.
Bonding conductor protective conductor providing equipotential
bonding.
Bonding the linking together the exposed extraneous metal parts of
an electrical installation. The installation and maintenance adequate and appro-
priate protective measures vital part the safe use electrical energy
