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

21D Testing of High Voltage Installations
(1) Safety
Precautionary measures should be taken and the methods of tests should
be such that no danger to persons or property can occur even if the
circuit being tested is defective.
(2) Testing requirements
Testing for High Voltage installations should be referred to relevant
recognised standards, manufacturers’ recommendation, operations and
maintenance instructions.
21E Points to be Noted by Registered Electrical Workers
(1) Signing of certificates
(a) A registered electrical worker should not sign certificates for tests
and inspections unless he has carried out or supervised the tests and
inspections on site, and is satisfied with the results of the tests and
inspections.
(b) A registered electrical worker should not sign certificates for tests
and inspections carried out by other registered electrical workers
unless:
(i) he has received the appropriate certificates for the tests and
inspection results certified by other registered electrical workers;
(ii) he is satisfied with the results of the tests and inspections;
(iii) he is satisfied that the certificates or inspection reports
submitted to him are completed and signed by registered
electrical worker of appropriate grade and in compliance with
the Wiring Regulations; and
(iv) he has taken reasonable steps to ascertain that the tests and
inspections have been genuinely carried out.
(2) Dates of tests, inspections and certification
It is acceptable that the actual dates of all tests and inspections be
different from the date of certification. However, for the registered
electrical worker to be satisfied that the results of these tests and
inspections are valid, he must ensure that the final inspections, insulation
resistance tests and functional tests of protective and control devices are
carried out as close to the date of certification as possible. Other tests
and inspections listed under Code 21 may be carried out at a reasonable
time, normally not exceeding one month, before the date of certification
provided that due precautions have been taken to ensure that nothing
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