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

(b) The work piece to be welded should be effectively and electrically
connected to the welding return before welding work is
commenced.
(3) Precautions for supply connection
Temporary or permanent supply should not be connected to a circuit
unless:
(a) the circuit and its final circuits, if any, are completed and properly
terminated, or
(b) the part(s) of the circuit or its final circuits which have not been
completed, are disconnected or isolated with its associated isolating
devices locked off.
(4) Precautions for major alteration
Before a major alteration is carried out on a circuit such as repositioning
of a circuit, the circuit should be either:
(a) disconnected from the supply source at the distribution board
concerned; or
(b) isolated with the isolating device locked off or its operation handle
removed. The key or the handle, being non-interchangeable with
any others which are used for a similar purpose for other parts of the
installation, should be kept by the responsible person.
(5) Use of ladder
A ladder made of wood or other non-conductive material should
preferably be used on electrical work. If the use of a metal ladder cannot
be avoided, the legs of the ladders should be fitted with proper insulated
footing.
(6) Use of portable equipment
Portable equipment of electrical work should be regularly checked and
maintained, especially for the connections at the plug, to ensure that the
equipment are in safe working order at all times.
4H Safety Precautions for Work on High Voltage
Installation
(1) General
(a) Precautionary measures, including those applicable ones stated in
Code 4G, should be taken and the procedure of work should be
such that no danger to persons or property will occur.
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