Singapore legislation
Regulation 15
Regulation 15
Cable for concealed wiring in installation
Subregulation 1
Where concealed wiring is installed in an electrical installation at a depth of less than 50 mm from the surface, no person shall use for such concealed wiring a non-metallic sheathed electricity cable or non-sheathed electricity cable without any metallic conduit or trunking protecting for such cable.
Subregulation 2
Where concealed wiring is installed in an electrical installation at a depth of 50 mm or more from the surface, a person may use for such concealed wiring without any mechanical protection —
a sheathed and polyvinylchloride insulated cable; or
any other electricity cable approved by the Authority.
Subregulation 3
Where an electricity cable referred to in paragraph (1) or (2) is used in the manner described in that paragraph, the person using the electricity cable shall ensure that the electrical installation is controlled by a high-sensitivity direct-acting residual current circuit breaker.
Subregulation 4
No person shall make any alteration to any premises or carry out or cause to be carried out any work which would affect the electrical installation in the premises in such a manner that the subsequent use of such electrical installation might endanger any person or property unless he has —
taken due care to ascertain the existence of any electricity supply to the premises and the location of any concealed wiring within the premises;
taken the necessary precautions to ensure that the alteration work will not cause any damage to the concealed wiring within the premises; and
checked and verified that the residual current circuit breaker controlling the electrical installation can operate satisfactorily by switching off and on again the said residual current circuit breaker at the end of each day’s work or alteration to the premises and there is no sign of leakage of electricity in the premises.