Gfre has brought up a few times now that you may have a main breaker that doesn't just trip on overload, but one that also trips if there is even a tiny ground fault. A ground fault is current flowing to ground instead of confined to the conductors. In the USA they are called GFCI breakers. Gfre says in Europe they are called RCD. If that's the case, then a current of just 30ma can trip it and you can get that from wet connections, outlets, etc. It's very common. Does that main breaker have anything that makes it look different? Markings? A test button?




RCD = residual current device

cute

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