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The previous owners of my house built an extension approximately three years ago. I've just tried to replace a one gang dimmer switch and found the following: - three twin and earth cables connect into the switch; - the three neutral cables are connected together by what looks like a terminal...

Thanks. Most appreciated.

Could anyone please tell me what this is? It's in the living room if the house I've just bought. The fuse box is in another room. I've no idea whether or not it's safe.