Please check me
Please check me
(OP)
New piece of equipment coming soon, total amp draw will be 100 amps. Please check my figures.
100 amp x 1.25 = 125amp x .8 derating the wire = #2 THHN, #8 ground
100 amp x 2.5(inverse timed breaker)= breaker rated 250amps
using NEC 2002 430.52 for breaker calculations.
100 amp x 1.25 = 125amp x .8 derating the wire = #2 THHN, #8 ground
100 amp x 2.5(inverse timed breaker)= breaker rated 250amps
using NEC 2002 430.52 for breaker calculations.





RE: Please check me
If this is for a dedicated motor branch circuit, the scenario is different by the way.
JRaef.com
"Engineers like to solve problems. If there are no problems handily available, they will create their own problems." Scott Adams
For the best use of Eng-Tips, please click here -> FAQ731-376
RE: Please check me
Just noticed the reference to 430.52, which means it must be a motor branch circuit. In that case you can use the 250A CB as long as you have an overload relay in your motor controller.
JRaef.com
"Engineers like to solve problems. If there are no problems handily available, they will create their own problems." Scott Adams
For the best use of Eng-Tips, please click here -> FAQ731-376
RE: Please check me