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

(iv) luminaires (lamp replacement and cleaning are included as
mechanical maintenance); and
(v) any other electrically energised equipment from which possible
mechanical or heat hazards can arise from the use of electrical
energy.
(b) Suitable means should be provided to prevent electrically powered
equipment from becoming unintentionally reactivated during
mechanical maintenance, unless the means of switching off is
continuously under the control of any person performing such
maintenance.
(c) Where electrically powered equipment is within the scope of BS EN
60204, the requirements for switching off for mechanical
maintenance of that standard apply.
(6) Emergency switching
(a) Means should be provided for emergency switching of any part of
an installation where it may be necessary to control the supply to
remove an unexpected danger.
(b) Means for emergency switching should be provided for the purpose
of cutting off the appropriate supply to the circuit concerned as
rapidly as possible in order to obviate or to remove a dangerous
condition as soon as it becomes apparent. A typical example where
means for emergency switching should be provided is a machine
driven by electrical means which may give rise to danger.
(c) Where electrically powered equipment is within the scope of BS EN
60204, the requirements for emergency switching of that standard
apply.
8B Requirements of Isolation and Switching Devices
(1) General
Where a common device is used to perform one or more of the following
functions:
(a) means of isolation;
(b) means of switching off for mechanical maintenance;
(c) means of emergency switching,
the arrangement and characteristics of the device should satisfy all the
requirements of this Code 8 for the various functions concerned.
53