On 29/05/2015 18:59, dennis@home wrote:
On 29/05/2015 01:40, John Rumm wrote:
On 28/05/2015 18:56, ARW wrote:

Of course some people still bang on about balancing the loads on a ring
circuit and mention portable electric heaters to back up their
statements.

They also ignore the point that a 20A protected radial could run
indefinitely with a pair of 13A fan heaters, and a cable de-rated to 20A
- but that would also spoil their argument. ;-)


Which cable is rated at 20A?
Not 2.5 mm T&E.

Yes the 2.5mm T&E may be rated at only 20A (and that would be the lowest
acceptable de-rated value permitted in a 20A radial or a 32A protected
ring).

See for example 2.5mm^2 T&E, reference method A:

http://wiki.diyfaq.org.uk/index.php?...es#Cable_Sizes

You can also calculate any required de-rating based on circumstances.

It is explained it in great detail he

http://wiki.diyfaq.org.uk/index.php?...g_A_Cable_Size


--
Cheers,

John.

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