What is the regulations saying with regards to three phase and single phase cooking appliances used in take away stores for example that is feed from a welding socket? The socket can also be classified as an isolator cause it serves the same perpose, but should it be on earth leakage or not? A fixed alliance don't need earth leakage protection cause its on an isolator but in this case its equipment thst s on wheels that can be moved for cleaning purposes due to the oil etc. I struggle to come to a solid point regarding this as there's so many points that almost sounds contradictory in sans 10142:1. And some equipment works on two phases and neutral but I haven't seen a 2 phase c\b except for live and neutral 2 pole circuit breakers and then the normal 3 pole circuit breakers. What's your opinion about this and issuing a coc for this kind of installation?