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

provided for the isolation of every self-contained luminaire, or of
every circuit supplying luminaires at a voltage exceeding low voltage.
(3) Unguarded moving parts
An installation where it is necessary for a person or persons to enter or
work in close proximity with normally unguarded moving parts which
may constitute a hazard should be provided with a means of isolation
near the moving parts in addition to any emergency switching provided.
(4) Electric motors
Electric motors except exhaust fans having rated power not exceeding
50W and servo-motors should be provided with:
(a) means of isolation suitably placed and so connected that all voltages
may thereby be cut off from the motor and all apparatus including
any automatic circuit breaker used therewith. If this means of
isolation is remote from a motor, an additional means of isolation
adjacent to the motor should be installed or alternatively provision
should be made so that the means of isolation can be secured
against inadvertent operation as required by Code 8B(2)(g);
(b) means for starting and stopping, suitably placed for ready operation;
and
(c) means to prevent automatic restarting after a stoppage due to drop
in voltage or failure of supply, where unexpected restarting of the
motor might cause danger. Such means is not required where the
failure of the motor to start after a brief interruption of the supply
would be likely to cause greater danger, e.g. motors driving a
ventilation fan of a fire protection system. This requirement does not
preclude any arrangement for starting a motor at intervals by an
automatic control device, where other adequate precautions are
taken against danger from unexpected restarting, e.g. various
sequential drives in an automatic processing plant, use of safety
equipment such as guards, barriers, etc.
(5) Switching off for mechanical maintenance
(a) Means of switching off for mechanical maintenance must be
provided where mechanical maintenance may involve a risk of burns
or a risk of injury from mechanical movement. These include every
circuit supplying:
(i) an electric motor;
(ii) electrical heating equipment;
(iii) electromagnetic equipment which may cause mechanical
accidents;
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