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421.1.201

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Mornin' all,

Would you say that the above regulation covers a large old farm barn, now used as a workshop/man cave/motorbike storage area/snooker room? The old barn is over 100 years old. It has thick solid walls and is attached to a modernish bungalow, but with no direct access to the bungalow. Basically can I install a plastic cased consumer unit?

 

Z.

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    I am constantly amazed at just what current can be carried by a wire that is just in contact with a terminal by chance with no tight screw connection. I have come across a few. Also a 40 Amp M.C.B. that was in accidental contact with a bus-bar in a consumer unit where the cage was misplaced and was not tightly connected to the bus-bar finger. It was just in accidental contact. But the shower still worked perfectly.

    If the MCB was on a proper DIN rail (with both top and bottom flanges) and all the other MCBs were holding the bus-bar firmly in its correct position, then the ‘wrong side’ of the cage clamp would probably have been held quite firmly against bus-bar - as they'd been the extra thickness of the cage clamp itself between the MCB's terminal and the bus-bar's normal position - the tightening happening when all the other MCBs were screwed onto the bus-bar would tend to lift the dodgy MCB - but that being resisted by the clip onto the DIN rail (if that makes sense…).

       - Andy.

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  • 0

    I am constantly amazed at just what current can be carried by a wire that is just in contact with a terminal by chance with no tight screw connection. I have come across a few. Also a 40 Amp M.C.B. that was in accidental contact with a bus-bar in a consumer unit where the cage was misplaced and was not tightly connected to the bus-bar finger. It was just in accidental contact. But the shower still worked perfectly.

    If the MCB was on a proper DIN rail (with both top and bottom flanges) and all the other MCBs were holding the bus-bar firmly in its correct position, then the ‘wrong side’ of the cage clamp would probably have been held quite firmly against bus-bar - as they'd been the extra thickness of the cage clamp itself between the MCB's terminal and the bus-bar's normal position - the tightening happening when all the other MCBs were screwed onto the bus-bar would tend to lift the dodgy MCB - but that being resisted by the clip onto the DIN rail (if that makes sense…).

       - Andy.

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