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Consumer unit tails hidden in void under stairs

Alan B

Hi

I did a consumer unit change in Friday including upgrading the tails from 16mm to 25mm.

The tails ran from an outside meter box, through the wall and then for about 70cm through a void formed by lower third of under stairs space being boxed in by brick walls, then going in to the back of the consumer unit.

The tails were clipped around the edge inside the meter box and held in a clamp inside the consumer unit; therefore well supported at both ends. But I have reused the concealed run and they are unsupported inside the void.

The only other options I could see would have been run them as armoured cable inside the void or in the outside of the house. For both options I would have created significant disruption and significant work.

Just wondering what others would have done in this situation.

Thanks

Alan

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    Alan B:  My main concern was that the boxed in area would be classed as fabric of the building and the cable would require more protection. Having read 522.6.202 my interpretation is that the boxed in section would not be classed as fabric of the building because it's not a wall or partition; this based on your comments leaves me comfortable with my installation.

    522.6.202 is concerned with cables installed in a wall or partition at a depth less than 50mm from a wall or partition surface. These cable might be damaged by nails or screws when people are hanging pictures or fixing up new shelves etc. So, we can (i) install the cables in zones where they will be expected to be, even if unseen behind plaster e.g. Or (ii) requires compliance with 522.6.204.

    Option (i) requires R.C.D. protection.

    If the cable is not installed in a  wall or partition then it is safer and may well be out of reach of 50mm long nails and screws anyway, or be very unlikely to be damaged.

    Any concealed cable of any depth run in a wall or partition of metal internal construction, shall have an R.C.D. protecting it. 522.6.203.

    Z.

     

     

     

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  • 0

    Alan B:  My main concern was that the boxed in area would be classed as fabric of the building and the cable would require more protection. Having read 522.6.202 my interpretation is that the boxed in section would not be classed as fabric of the building because it's not a wall or partition; this based on your comments leaves me comfortable with my installation.

    522.6.202 is concerned with cables installed in a wall or partition at a depth less than 50mm from a wall or partition surface. These cable might be damaged by nails or screws when people are hanging pictures or fixing up new shelves etc. So, we can (i) install the cables in zones where they will be expected to be, even if unseen behind plaster e.g. Or (ii) requires compliance with 522.6.204.

    Option (i) requires R.C.D. protection.

    If the cable is not installed in a  wall or partition then it is safer and may well be out of reach of 50mm long nails and screws anyway, or be very unlikely to be damaged.

    Any concealed cable of any depth run in a wall or partition of metal internal construction, shall have an R.C.D. protecting it. 522.6.203.

    Z.

     

     

     

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