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Safe cable size for 3kw immersion heater.


 
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Andystu

from United Kingdom

Joined: 17 Feb 2007
Posts: 9
Location: Nottinghamshire,
United Kingdom

PostPosted: Wed Nov 05, 2008 1:13 am Reply with quote

Hi, all. A friend of mine has just had a new boiler and cntral heating system to replace his original one. For some reason, the old immersion heater was connected to 1.5mmT&E. The electrician that came to wire up the new system including the new immersion heater, said that the 1.5mm T&E cable was ok to leave in and wire up to.!. Is this the case or was he just being lazy not wanting to rewire with 2.5mm T&E. The cable is on its own circuit and the length is aprox 25metres. Also, I was wondering if the fuse fitted is ok at 16amps, i'm just a little concerned that the safety device i.e the circuit breaker can stand more than the cable?
Any advice would be appreciated.
Andy Stu
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plugwash

from United Kingdom

Joined: 28 Mar 2004
Posts: 8439
Location: United Kingdom
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PostPosted: Wed Nov 05, 2008 1:28 am Reply with quote

how is the cable run? In particular does it run through any insulation?
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Andystu

from United Kingdom

Joined: 17 Feb 2007
Posts: 9
Location: Nottinghamshire,
United Kingdom

PostPosted: Wed Nov 05, 2008 9:24 am Reply with quote

I believe it runs from the consumer unit which is located in the single storey garage, up through the garage lof space which has a small amount of insulation, maybe 50mm then under the floor boards and into the airing cupboard. If the route is vital for the calculation then I can find out exactly in more detail.

Thanks,

Andy Stu
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Softus

from United Kingdom

Joined: 21 Oct 2004
Posts: 19558
Location: United Kingdom
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PostPosted: Wed Nov 05, 2008 9:50 am Reply with quote

The route isn't vital - 1.5mm˛ T&E can safely carry more than 13A even if insulated and in conduit.

A 16A breaker is also fine, but the outlet in the airing cupboard should be fused at 13A.
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