10mm twin & earth cable
- Thread starter jock
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B
Big_Spark
jock said:
NO
B
Big_Spark
jock said:
NO, if you damage the sheath of the cable inside the conduit you will never know and this could be potenially dangerous.
How far down the wall does the cable need to go?
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It's a bungalow, so only from the loft to the shower - a metre at most. (I'm upgrading from 8kw, so changing cable from 6mm to 10mm.)
What about 10mm singles (red and black) with grey sheaths (like the 16mm "tails" feeding a domestic board)? Do these exist?
What about 10mm singles (red and black) with grey sheaths (like the 16mm "tails" feeding a domestic board)? Do these exist?
B
Big_Spark
jock said:
They do exist, but you will not get two 10mm2 cores and one 6mm Earth core down a 20mm pipe.
If it is only a meter, why not simply cut the conduit out of the wall, insert the cable, cover it with capping and make good?
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Capping you will find at the DIY sheds (Boo!!) in upvc and sometimes metal. It is a flat casing that you place over the cable, and (carefully!) nail or screw into place b4 plastering over.
Re the conduit, 10mm2 Twin & Earth cable will not physically fit in 20mm conduit , but even if it did, there's a rule that says you have to have space left, 45%.
Re the conduit, 10mm2 Twin & Earth cable will not physically fit in 20mm conduit , but even if it did, there's a rule that says you have to have space left, 45%.
B
Big_Spark
Baggy said:
That is correct, you should not really put T&E in conduit, although on occasion you have no choice, but it should not fill the conduit completely.
2 2.5T&E will be tight in a 20mm conduit and would not be recommended.
HOWEVER, if you stripped the T&E, sleeve the Earth, or replace it with an insulated conductor (1.5mm2 is big enough), making sure to make a really good joint on them, then four 2.5mm2 cores and two 1.5mm2 cores will easily fit in 20mm conduit and allow compliance and an air gap.
FWL_Engineer said:
Just out of interest, why is this? Why is the air gap required?
I know for a fact that my kitchen has 2 x 2.5mm T&E running in single conduit (don't ask me how I know
)... is this really a problem? Is it worth the effort of sorting this out?
B
Big_Spark
Baggy, in practice this will not be an issue under normal conditions, however the air gap is required as cables carrying current create heat.
Normally this heat is not an issue, but in heavy load conditions it can be a problem. That is why the Regs specify grouping factors for cables in conduit, trunking, ducting etc.
To be perfectly honest I would not worry about those already in the conduit, but I would advocate this practice, of course what an individual chooses to do in their own home is a matter for them, so long as it is not dangerous.
Normally this heat is not an issue, but in heavy load conditions it can be a problem. That is why the Regs specify grouping factors for cables in conduit, trunking, ducting etc.
To be perfectly honest I would not worry about those already in the conduit, but I would advocate this practice, of course what an individual chooses to do in their own home is a matter for them, so long as it is not dangerous.
jock said:
You are upgrading the whole of the cabling between the CU and the shower aren't you? As well as the (ceiling pull-cord) switch for the shower?
Apologies if you already have done, just it rang an alarm bell in my head with the "a metre at most"!
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