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WHAT IS THE THUMB RULE FOR DECIDING THE CURRENT RATING OF
COPPER WIRES SAY 2.5/4/6/10 MM SQUARE SIZES??
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Answer Posted / hdn electrical
There is no 'rule of thumb'. The current carrying capacity
of a cable can vary greatly depending on the location and
installation method in which it is used.
The tables in BS 7671 will show optimum carrying capacities,
but will then be subject to de-rating factors such as
ambient temperature, grouping, how it's fixed in/on a wall
or if it will be covered by insulation.
If you are unsure you should contact a qualified electrician.
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