Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

current carrying capacity is reduced and the position of the
protective device provided that the conductors are:
(i) not exceed 3m in length, and
(ii) be erected in such a manner as to reduce the risk of fault, fire
or danger to persons to a minimum.
(c) The device may be placed at a point other than specified in
subparagraph (a) provided that the conductors between the device
and the point of reduction in current carrying capacity are
adequately protected against fault current according to Code 9B(2)
by a fault current protective device installed on the supply side of the
point of reduction.
9E Other Requirements of Overcurrent Protective Devices
(a) Overcurrent protective devices should be placed in enclosure that are
free from easily ignitable materials.
(b) Every overcurrent protective device should be provided on or
adjacent to it an indication of its intended nominal current as
appropriate to the circuit it protects.
(c) Fuses which are likely to be removed or replaced whilst the circuits
they protect are energised, should be of a type such that they can be
thus removed or replaced without danger.
(d ) Suitable tools for safe withdrawal of fuses at a fuse board should be
provided where necessary.
(e) Where circuit breakers may be operated by persons other than a
registered electrical worker, they should be designed or installed so
that it is not possible to modify the setting or the calibration of their
overcurrent releases without a deliberate act involving either the use
of a key or tool. A visible indication of the setting or calibration is
recommended.
(f ) Operating handles of circuit breakers should be made accessible
without opening any door or cover giving access to live parts.
(g) All linked circuit breakers for overcurrent protection of equipment
run on polyphase supply must be purposely designed by the
manufacturer to enable breaking of all related phase conductors
simultaneously. Any modified miniature circuit breaker to achieve as
a linked circuit breaker is not acceptable.
(h) When a consumer’s main switch or circuit breaker is connected
directly to the electricity supplier’s distribution transformer, the
overcurrent protection should discriminate with the electricity
supplier’s high voltage protection settings.
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