- Joined
- 18 May 2020
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I have a house supply from which a cable supplies a separate circuit breaker box in the garage with 4 sockets on a ring main. One of these has a spur to the greenhouse through a heavy duty armoured cable. The fuse box is 15amp and a fan heater plus thermostat control is plugged into the greenhouse socket. When switched on this immediately trips the whole domestic supply circuit breaker in the house but not the circuit breaker box in the garage. There is no water ingress and I have checked all the wiring and it is 100%. What is wrong?