We are just in the middle of refurbishing our house and we have the electrician in at the moment but when we have been cleaning the joists we have noticed that some of the cabling that has been pulled through the drilled holes in the joists has split exposing the wires. Should we pull the electrician on this or will it be ok ? Is this acceptable ? It’s not just on one wire it’s on 3 different ones that we have seen so far. Also is it ok for cables to be next to central heating pipes ?