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Topic Title: 25mm tails in insulation
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Created On: 17 January 2013 07:36 PM
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 17 January 2013 07:36 PM
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beaver74

Posts: 361
Joined: 07 February 2007

Hi all

have a consumer unit which has 25mm tails run through the cavity up from the cut out.now there is talk of having the cavity insulated.looking at the regs 25mm tails in conduit in insulation is 80A. if this goes ahead does any one see a problem with pulling out and re-installing in flexy conduit.
 17 January 2013 07:39 PM
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daveparry1

Posts: 6225
Joined: 04 July 2007

How long a distance?
 17 January 2013 07:42 PM
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beaver74

Posts: 361
Joined: 07 February 2007

about 2.5M.
 17 January 2013 07:44 PM
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beaver74

Posts: 361
Joined: 07 February 2007

also this is a 60A cut out so 80A will be good to go
 17 January 2013 07:47 PM
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daveparry1

Posts: 6225
Joined: 04 July 2007

With 25mm tails on a 60 amp cut-out fuse I wouldn't be at all bothered about the insulation.
 17 January 2013 07:49 PM
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beaver74

Posts: 361
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cheers
 17 January 2013 11:27 PM
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AJJewsbury

Posts: 11502
Joined: 13 August 2003

if this goes ahead does any one see a problem with pulling out and re-installing in flexy conduit.

I don't really see much of an advantage on 25mm2 tails in flexible conduit surrounded by thermal insulation, verses 25mm2 tails direct in thermal insulation. You might be increasing the surface area slightly, but at the cost of another air gap (like double glazing), so I don't see that the basic problem of letting heat escape from the conductors being improved much.
- Andy.
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