Cable current rating

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Simpo067

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Leaving aside cost and practicality which usually comes up,

Table F4(1) in the OSG for single core cable gives a current capacity of 21A for 3 or 4 cables at 2.5mm square using method B at 3 phase. It doesnt give a single phase rating.

It does give one for 2 cables (24A), what am I missing?

I want to run two supplies of 2.5mm square single cable therefore 6 cables at single phase.

Any help appreciated.
 

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