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- 9 Jan 2005
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I noticed when I switched off the upstairs light circuit (MCB) the garage light was still on (consumer unit is in garage). So I switched this back on and switched the downstairs light circuit off and the garage light was still on. On further investigation the downstairs curcuit will only switch off by switching both MCB's off (the same applies for upstairs). Basically the only way I can isolate either circuit is to switch both MCB's off
Because of this I looked in the consumer unit and noticed that the downstairs lighting MCB has two live cables going into it and the upstairs has one.
Can someone tell me why this would be and is it dangerous.
Hope you can help.
Because of this I looked in the consumer unit and noticed that the downstairs lighting MCB has two live cables going into it and the upstairs has one.
Can someone tell me why this would be and is it dangerous.
Hope you can help.