perspicacious:Taken from where?I think we've fed the OP enough now......................Perhaps the OP could have a stroll through this?https://shop.theiet.org/bs-7671-2018-requirements-for-electrical-installations-iet-wiring-regulations-18th-edition-blue
Attempted character assassination?You're simply reverting to type again, as always seems to be the case.Once again, no answer to what should be a simple question!
