532 DEVICES FOR PROTECTION AGAINST THE RISK OF FIRE
532.1 Where, in accordance with the requirements of Regulation 422.3.9, it is necessary to limit
consequence of fault currents in a wiring system from the point of view of fire risk, the circuit shall be either:
(i) protected by an RCD complying with Regulation 531.2 for fault protection, and
- the RCD shall be installed at the origin of the circuit to be protected, and
- the RCD shall switch all live conductors. and
- the rated residual operating current of the RCD shall not exceed 300 mA
or (ii) continuously monitored by an insulation monitoring device(s) complying with Regulation 538.1 and which
initiates an alarm on the occurrence of an insulation fault.
NOTE 1: A fault location system Complying with Regulation 538.2 which is able to locate the faulty circuit may be helpful,
NOTE 2: For locations liming a risk of explosion see BS FN 60079-10. BS EN 60079-14, BS EN 61241-10 and BS EN 61241-14
NOTE 3: The following methods which are additional to the requirements may also be employed:
- devices intended to provide protection from the effects of are faults
- devices intended to provide protection in case of overheating
- optically operated devices that provide signalling to another device intended to break the circuit
- smoke detection devices that provide signalling to another device intended to break the circuit.