IEC 60364-4-42:2010-05/AMD1:2014-11 цитирую:
Add, after 421.6, the following new clause: 421.7 It is recommended that special measures be taken to protect against the effects of arc faults in final circuits: – in premises with sleeping accommodation; – in locations with risks of fire due to the nature of processed or stored materials, i.e. BE2 locations, (e.g. barns, wood-working shops, stores of combustible materials); – in locations with combustible constructional materials, i.e. CA2 locations (e.g. wooden buildings); – in fire propagating structures, i.e. CB2 locations; – in locations with endangering of irreplaceable goods. NOTE 1 A material is considered to be non-combustible if, in compliance with ISO 1182 [31] and ISO 1716 [32], it does not support combustion. In a.c. circuits, the use of arc fault detection devices (AFDD) in compliance with IEC 62606 will satisfy the above-mentioned recommendation. If used, an AFDD shall be placed at the origin of the circuit to be protected. NOTE 2 An AFDD is a device intended to mitigate the effects of arcing faults by initiating disconnection of the circuit when an arc fault is detected, see Annex B. The use of AFDDs does not obviate the need to apply one or more measures provided in other clauses in this standard. NOTE 3 National committees may decide if the use of AFDDs is made a requirement or a recommendation in their national standard.