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- 2 Mar 2006
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We have 4 circuits with MCB's protected by a Siemens 80A 5 SM3 317-0 RCCB with 30mA rated residual current. Came back from holiday last year to a defrosted freezer and a tripped RCCB. Never found the source and it never re-occurred... until now.
After torrential downpours it tripped again. I was able to isolate the problem to the circuit that has a fused spur to the pond pump/uv light. The cable goes to switches mounted on the garden wall and then to a box on the ground with uv light and connection to the pump. Will it be moisture in the box on the ground that's the likely culprit ? What device can I install in the fused spur circuit so that trips rather than the 80A RCCB which takes out all of the ring circuits ?
After torrential downpours it tripped again. I was able to isolate the problem to the circuit that has a fused spur to the pond pump/uv light. The cable goes to switches mounted on the garden wall and then to a box on the ground with uv light and connection to the pump. Will it be moisture in the box on the ground that's the likely culprit ? What device can I install in the fused spur circuit so that trips rather than the 80A RCCB which takes out all of the ring circuits ?