When high voltage equipment or cables are to be discharged and earthen, the operation shall be carried out in the following prescribed manner:
• Verify that the circuit is not ‘live’ and, where practical, test it by means of a voltage indicator of an approved type. The indicator itself shall be tested on a known ‘live’ source, immediately before and after use.
• Where the facilities exist, earthing shall be effected via an EARTHING CIRCUIT BREAKER and operated in the manner prescribed in the manufacturer’s instruction manual.
• Where use is required of a portable earthing device, the device shall consist of an insulated rod of not less than 70mm2 copper, the size being related to the probable short circuit current. An insulated flexible EARTHING LEAD shall be securely connected between the rod and the main earth, its gauge being related to the probable short circuit current.
• Apply the earth to each phase by means of the insulated rod, so that each conductor of the equipment is discharged one at a time. This should be performed at least five times with a 10 seconds interval to allow for static build up. The conductors should then be shortened collectively.
• After the equipment has been discharged and whilst the discharged lead is still in position, EARTHING BONDS of a similar cross section must be secured by the authorized person or the competent person acting to his instructions.
• Where the equipment to be worked on can be fed from more than one source, an EARTHING BOND shall be attached on each side of the equipment.
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Непонятно еще в контексте выше чего делают с проводниками. Укорачивают? The conductors should then be shortened collectively.