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Topic Title: burried cables
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Created On: 22 April 2013 02:13 PM
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 22 April 2013 02:13 PM
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inamess

Posts: 62
Joined: 19 August 2009

what does K.m/W stand for on page 326 of the big green bible
cheers
 22 April 2013 02:29 PM
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OMS

Posts: 19462
Joined: 23 March 2004

It's a measure of thermal resistance - effectively watts per metre per degree kelvin.

So essentially it's a measure of how well the surrounding ground stops the flow of heat from a cable (in this case)

The bigger the number, the better the resistance (insulation) - so Table 4B3 should show you that the less thermal resistance the ground presents to the cable, the more current you can run down the cable without overheating.

regards

OMS

-------------------------
Failure is always an option
 22 April 2013 02:35 PM
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ebee

Posts: 5666
Joined: 02 December 2004

Do B & Q sell this thermally conductive soil at a decent price?

-------------------------
Regards,
Ebee (M I S P N)

Knotted cables cause Lumpy Lektrik
 22 April 2013 02:39 PM
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inamess

Posts: 62
Joined: 19 August 2009

thanks oms thought it was kelvins but not sure
 22 April 2013 02:44 PM
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OMS

Posts: 19462
Joined: 23 March 2004

Originally posted by: ebee

Do B & Q sell this thermally conductive soil at a decent price?


I can sell you some top quality thermally conductive soil for about £300/tonne - Ebee (that's delivered).

It really is excellent stuff - I can sell you it by the bag as well, if you only want a small quantity - let's call it £10.00 for 25kg.


Right, off to find some Arabs who may need thermally conductive soil -

Regards

OMS

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Failure is always an option
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