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AE
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NICEIC Area
Engineer |
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BS |
British
Standard |
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Circuit |
An assembly of
electrical equipment supplied from the same origin and
protected against overcurrent by the same protective
device(s).
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Circuit-breaker |
A device
capable of making, carrying and breaking normal load currents
and also making and automatically breaking, under
pre-determined conditions, abnormal currents such as
short-circuit currents. It is usually required to operate
infrequently although some types are suitable for frequent
operation.
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Class I
equipment |
Equipment in
which protection against electric shock does not rely on basic
insulation only, but which includes means for the connection
of exposed-conductive-parts to a protective conductor in the
fixed wiring of the installation (see BS 2754). Class I
equipment has exposed metallic parts, e.g. the metallic
enclosure of washing machine.
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Class II
equipment |
Equipment in
which protection against electric shock does not rely on basic
insulation only, but in which additional safety precautions
such as supplementary insulation are provided, there being no
provision for the connection of exposed metalwork of the
equipment to a protective conductor, and no reliance upon
precautions to be taken in the fixed wiring of the
installation (see BS 2754). Class II equipment is identified
by construction mark: |
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Class III
equipment |
Equipment in
which protection against electric shock relies on supply at
SELV and in which voltages higher than those of SELV are not
generated (see BS 2754). Class III equipment is identified by
construction mark: |
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Consumer unit
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Also known as a
fusebox, consumer control unit or electricity control unit. A
particular type of distribution board comprising a
co-ordinated assembly for the control and distribution of
electrical energy, principally in domestic premises,
incorporating manual means of double-pole isolation on the
incoming circuit(s) and an assembly of one or more fuses,
circuit-breakers, residual current operated devices or
signalling and other devices purposely manufactured for such
use.
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Distribution
board |
An assembly
containing switching or protective devices (e.g. fuses,
circuit-breakers, residual current operated devices)
associated with one or more outgoing circuits fed from one or
more incoming circuits, together with terminals for the
neutral and protective circuit conductors. It may also include
signalling and other control devices. Means of isolation may
be included in the board or may be provided
separately.
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Electrical
installation |
Any assembly of
associated electrical equipment supplied from a common origin
to fulfil a specific purpose and having certain co-ordinated
characteristics.
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IEE |
Institution of
Electrical Engineers |
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IU |
Inspection Unit
(half-day visit) |
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LV |
Low
Voltage |
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mA |
Milliamp or
1/1000 part of an amp |
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NICEIC |
National
Inspection Council for Electrical Installation
Contracting |
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Overcurrent |
A current
exceeding the rated value. For conductors the rated value is
the current-carrying capacity. |
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PAT |
Portable
Appliance Testing |
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PIR |
Periodic
Inspection Report |
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PLI |
Public
Liability Insurance |
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Portable
equipment
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Electrical
equipment which is moved while in operation or which can
easily be moved from one place to another while connected to
the supply.
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PQS |
Prospective
Qualified Supervisor |
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Prospective
fault current |
The value of
overcurrent at a given point in a circuit resulting from a
fault of negligible impedance between live conductors having a
difference of potential under normal operating conditions, or
between a live conductor and an
exposed-conductive-part.
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QS |
Qualified
Supervisor |
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RCD |
Residual
current device |
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Ring final
circuit |
A final circuit
arranged in the form of a ring and connected to a single point
of supply
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SELV |
Separated
Extra-Low Voltage. An extra-low voltage system which is
electrically separated from Earth and from other systems in
such a way that a single fault cannot give rise to the risk of
electric shock.
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Voltage,
extra-low |
Normally not
exceeding 50 V a.c. or 120 V ripple-free d.c., whether between
conductors or to earth.
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