Domestic CU move guidance

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hoarec

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Be gentle as this is my first post (and my first piece of hands on electircal work). I am "qualified" (C&G inspection and testing, 17th edition etc) but this is the first time I've taken on a substantial piece of work. I'm in the process of rewiring my own house.

I'm putting a new CU in and also moving it. It's only going to be about 2m from the meter so I shouldn't need to put a fused switch in on the extended tails but the CU will now be on the other side of the wall on which the meter sits. So the new tails will route through that single brick wall. That wall separates the house from the integrated garage so I'm into fire compartments etc. So question is how do I get the new tails through the wall so that the tails are protected and the fire compartmentation is maintained? Also concerned about the bend radius on the tails.
 

Richard Burns

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You would need to fire stop the penetration through the wall so that fire cannot spread from garage to house or vice versa.
Have a look at Approved Document B vol 1 part B3 section 7.
Do not flatten the tails to the wall allow them to curve through the hole , if possible fit the CU over the tails so they can come in straight.
If the cable is securely fixed in place then there should be no damage to the cable once it is through the wall, if you want to use conduit through the wall then I would seal it with an intumescent seal so that it can close up in case of fire.
 
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hoarec

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Thanks for that. I've put 20mm conduit through (lined up with the CU so the tails go straight in). The conduit is firestopped with mortar with the tails sealed at conduit ends with intumescent seal. Guess I better think about plugging up the three fist size holes in the garage ceiling that the existing cables go through (or is that classed as exisiting so I can safely leave them)
 
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