Sub-panel installation

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Farmfly

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Location
North Carolina
Occupation
Electrician
hey all. I need to add a sub panel to a 200 amp service that obviously has no breaker space how do you determine that the sub panel will not overload the 200 amp panel. Thks
 
With load calcs. It's about total load current, not total circuit quantity.

The simplest solution is to properly use a pair of tandem breakers.
 
You need to determine the existing load, then add the new load to that to get your total. Use Article 220 for the load calculations.
 
At least someone is looking to actually calculate or question just adding another panel. Most around my area are if it ain't burning then it's ok to add another load. Ask if they did a load calculation and get "What's that?".
 
charlie b said:
, but it sounded like an unlicensed contractor. That was unkind and not in keeping with the behaviour that the forum owner expects from its members. We do not challenge another member's need to post a question here. Nobody knows everything.
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Since the OP and I are both from NC his question struck me as peculiar. So I went back and read his other post. Every question is something you have to know to become a licensed electrician in NC.
I apologize.
I did hear the NCBEEC were going to make the exam easier,
 
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