Service conductor size.

Status
Not open for further replies.
Y

yanert

Member
I have been doing a lot of service load calculations for practice and just want to make sure I have not forgotten something.
If my total demand for my home came up to 60,240VA and my voltage is 120/240, I could size my conductors to 250 kcmil, (251 amps)(table 310.15b6 and my main OCPD breaker could be a 300 amp. This would be in accordance with 240.4B

Thanks
 
Re: Service conductor size.

I would personally find a way to lose that 1-ampere during the calculation by rounding down or something. This would permit the use 4/0 conductors and a 250-ampere service.
 
Re: Service conductor size.

I believe you are correct, however there has been recent debate about the meaning behind 310.15(B)(2). Maybe Bob will chip in and offer his view.
Jim T
 
Re: Service conductor size.

That demand seems a bit high for a home, unless you have a pretty big house! :D

What's your connected load?
 
Re: Service conductor size.

The calculated load is from a test question. Also, another reason I have never really confronted this is the fact that where I am at, the Utility Co, always requires a over-built service in relation to the code.
 
Re: Service conductor size.

This is a good one. Bryan's right. Shave it down.

I have never been asked to demonstrate my load calculations.

I don't want to sound like I'm flaunting the system, cause I'm not. One amp. Load calculations are pushing the figures way way past 1 amp in the opposing direction.

Edit: Oh, test question, any wonder it's such a good one. Too bad you wont get points for real world answers.

[ February 11, 2005, 02:30 PM: Message edited by: physis ]
 
Status
Not open for further replies.
Top