thankyou howard that was an excellent explanation i think i`ll give up nursing now and train to become an electrician as it sounds interesting.
We do have a 3kw heater in garage which may be the culprit but will get it checked once again thankyou for your help
can someone help please we have a garage unit with a 63 AMP 30mA main switch with a 16a for sockets and 6a for lights the cable supplying the garage appears to be getting warm and i think is a 2.5mm cable from a 16a mcb in the main box.Is this ok or shold cable be capable of carrying 63A?