8.3 Equipment and the area around
it
Electrical installation:
An assembly of electrical leads and the appliances to
which the leads are connected.
Switching and distribution unit, switchgear
A unit to protect or switch on or off, in one place, two or
more parts of an electrical installation.
Switch room:
The area in which the switchgear is set up.
Working area:
A clearly indicated part of the operating area in which
work on the installation can be carried out safely.
Switch:
An apparatus designed to switch electrical currents on
and off.
Load-break switch:
A switch capable of safely switching on a short-circuit
current and switching off a nominal current.
Circuit-breaker:
A switch capable of operating safely under abnormal
circumstances, and in particular capable of switching a
short-circuit current on and off safely.
Fuse:
An electrical appliance that is connected in series with a
circuit, and can interrupt the circuit safely by the melting
of an internal conductor immediately the current in the
circuit exceeds a specified value for a specified time.
Cartridge fuse:
The replaceable part of a fuse that contains the (melting)
conductor.
Busbar insulating bushings:
Insulators for running busbars through the sidewalls of
switch panels so as to be proof against arcing.
Tapered bushings:
Insulators for running insertion contacts through the
partition walls between the switch compartment and the
busbar and cable compartments, so as to be proof
against arcing
Witdrawable Unit:
A unit on a withdrawable carriage designed to be
inserted into the switchgear compartment and can be a
circuit breaker, contactor, metering truck, disconnector
truck, VT truck for example.
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