S
sparkyspike
Surely as long as the cable is OK for the MCB rating it doesn't matter if it's not the same as used in other parts of the circuit?
Yes, but we don't know whether the cable is OK for the MCB rating as we don't have the required information. If the OP is asking whether 1mm is OK then he probably isn't able to assess the design of the original installation in order to select the correct cable. To use the same cable as the existing which is likely to have been correctly designed, is better advice then saying- 'use what you like, if it is the right size cable for the job'. If the OP knew what the right size was, he wouldn't have asked whether 1mm would be OK!