(Just in case anyone asks - if a Part 7 requirement for RCDs is numbered 7ab.411.x.y, then that modifies Regulation 411.x.y which is a requirement for ADS, not the reduced low voltage system, which would be numbered 7ab.418.x.y. Therefore Regulation 701.411.3.3 would not apply for a reduced low voltage system in a location containing a bath or shower, provided all the requirements for RLVS are met)

OK, I'll ask! ?


It seems to me that RLV is part of 411 rather than 418 - 411.8 to be precise. So if the requirements of 411.3.3 apply to 411.4 (LV TN systems), and 411.5 (LV TT systems) and presumably 441.6 (IT systems), where's the logic in saying it doesn't likewise apply to 411.7 (FELV) or 411.8 (RLV)?


(Although I can agree there should be such logic - after all the while point of RLV was that it should be safe for shocks due to L-PE faults without relying on disconnection at all, and I can see all sorts of practical problems finding RCDs that'll operate at FELV voltages).


   - Andy.

(Just in case anyone asks - if a Part 7 requirement for RCDs is numbered 7ab.411.x.y, then that modifies Regulation 411.x.y which is a requirement for ADS, not the reduced low voltage system, which would be numbered 7ab.418.x.y. Therefore Regulation 701.411.3.3 would not apply for a reduced low voltage system in a location containing a bath or shower, provided all the requirements for RLVS are met)

OK, I'll ask! ?


It seems to me that RLV is part of 411 rather than 418 - 411.8 to be precise. So if the requirements of 411.3.3 apply to 411.4 (LV TN systems), and 411.5 (LV TT systems) and presumably 441.6 (IT systems), where's the logic in saying it doesn't likewise apply to 411.7 (FELV) or 411.8 (RLV)?


(Although I can agree there should be such logic - after all the while point of RLV was that it should be safe for shocks due to L-PE faults without relying on disconnection at all, and I can see all sorts of practical problems finding RCDs that'll operate at FELV voltages).


   - Andy.