Hello:
Just wanted to get the general opinions on the following that was being discussed:
The statement:
30 amps will develop 2 1/4 times more heat than 20 amps in a conductorThe data to backup the claim:
Most of us know that developed power is the product of the voltage and current, but voltage is equal to the current multiplied by the resistance, Hence:
P=VI V=IR
Substituting: P=(IR)I P=I(squared)R
The resistance for the conductor hasn't changed but the current has changed from 20A to 30A. 30 is 20(1.5):
P=(1.5)(squared)R
1.5 (squared) = 2.25 P=2.25RTo me this is a wee bit simplistic, it doesn't take into consideration size of conductor, ambient temperature, length of run etc...