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 / simon
The rule of thumb for current carrying capacity of copper
wire is 6 amperes per square millimeter of cross-sectional
area for an insulated, uncooled conductor.
Therefore the following applies:
1.0mm 6A
1.5mm 9A
2.5mm 15A
6.0mm 36A
Note that with air cooling, such as within an electric motor
or generator, the current carry capacity of the conductor
may be as high as five times the figures above (up to
30A/mm2) but is dependent on the efficiency of the cooling.
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