Rafal Kaczynski
Hi Marc As long as cable is fitted under BS7671 17 th edition standards you should not be worry about. Trunking is allowed to be fitted in a bathroom as long as main cable is fully fitted inside shower unit and terminals are not visible and seal. I think that your new shower required a new cable fitted and your walls was tiled already so engineer did not want to disturb surface ( lack of same tiles etc) that's why he hide cable inside trunking. I hope this can help Best regards Rafal
