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

(3) Work on H.V. electrical equipment
(a) Work involving the handling of live parts or working within
touchable distance, direct or indirect, of live parts, is not permitted.
(b) No person should carry out maintenance, repair, cleaning and
testing on any part of high voltage electrical equipment unless such
parts of the electrical equipment are:
(i) dead;
(ii) isolated from live conductors and all practical steps taken to
lock off from live sources;
(iii) effectively earthed at all points of disconnection of supply to
such apparatus or between such points and the points of work;
(iv) fixed with warning notices for repair, barriers and/or screens;
and
(v) released for work by issue of a permit-to-work (sample shown
in Appendix 16).
It is the duty of the responsible person to ensure that all the
foregoing provisions are complied with prior to the issue of the
permit-to-work.
4I General Safety Practices
Codes 4G, 4H and other requirements mentioned elsewhere in the CoP
are safety practices to be observed for work on electrical equipment. In
addition, the following general safety practices should be observed for
work on electrical equipment:
(a) Check before Act
The scope of work and relevant circuit should be checked before
starting any electrical work. Suitable lighting and adequate
illumination should be provided for the workplace. The condition of
tools and instruments should also be checked before carrying out
electrical work.
(b) Isolate and Lockout
The circuit / equipment under maintenance should be isolated as far
as practicable. The relevant isolator should be locked out. A
suitable warning notice should be placed close to the isolator.
(c) De-energize
The circuit/equipment to be worked on should be checked to ensure
that it is dead.
(d ) Others
(i) The workplace should be kept clean and tidy.
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