Definitions
Earth the conductive mass the
earth. Whose electrical potential is
taken zero.
Extraneous conductive parts the
structural steelwork building and
other service pipes such gas, water,
radiators and sinks.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. 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. They not
form part the electrical installation but may introduce potential, gen-
erally earth potential, the electrical installation. Chapter the IEE
Regulations describes the earthing arrangements for electrical installa-
tion.
Fault protection provided pro-
tective equipotential bonding and
automatic disconnection the sup-
ply (by fuse miniature circuit
breaker, MCB) accordance with IEE
Regulations 411.3 6. Therefore,
the provision protective devices electrical installation fundamen-
tal the whole concept the safe use electricity buildings.
Let first define some the words will using.
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. The installation and maintenance adequate and appro-
priate protective measures vital part the safe use electrical energy. Whose electrical potential is
taken zero.
Bonding the linking together the exposed extraneous metal parts of
an electrical installation.3 6.
Fault protection provided protective equipotential bonding and
automatic disconnection the supply (by fuse miniature circuit
breaker, MCB) accordance with IEE Regulations 411.
This the green and yellow insulated conductor twin and earth cable.
Circuit protective conductor (CPC) protective conductor connecting
exposed conductive parts equipment the main earthing terminal.
Bonding conductor protective conductor providing equipotential
bonding.
Extraneous conductive parts the structural steelwork building and
other service pipes such gas, water, radiators and sinks.
Shock protection protection from electric shock provided basic pro-
tection and fault protection.
Bonding the linking together the
exposed extraneous metal parts of
an electrical installation.
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. Using electricity hazard
because has the ‘potential’ and the possibility cause harm.
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.
Basic protection provided the
insulation live parts accord-
ance with Section 416 the IEE
Regulations.
.
Circuit protective conductor (CPC) a
protective conductor connecting
exposed conductive parts equip-
ment the main earthing terminal.
Earthing the act connecting the
exposed conductive parts instal-
lation the main protective earthing
terminal the installation. gives the following definitions:
Earth the conductive mass the earth.
Basic protection provided the insulation live parts accordance
with Section 416 the IEE Regulations.
Bonding conductor protective
conductor providing equipotential
bonding.
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
