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View Full Version : How we can select wire diameter according to electrical load?


hytham1989
Jul 15, 2012, 10:51 AM
I want detailed explaining with equation equations

Stratmando
Jul 15, 2012, 01:35 PM
Usually goes by Wire Gauge, not diameter.
Basically you Start with your load and see what it needs, then you size the wire accordingly and a breaker to protect the wire from burning.
#14 for 15 Amps
#12 for 20 Amps
#10 for 30 Amps
#8 For 40 Amps and so on, and is called Ampacity.
Wire size may need to be increased due to voltage drop if it is a long run, insulation is another factor.
There are Exceptions as well.

sinnadurai
Jul 15, 2012, 10:01 PM
Diameter doesn't decide the current rating but the cross section and composition of wire whether stranded,single,flexible as well as its insulation,ambient temperature etc