How can I figure out the limit of the main-panel. The labels are destroyed. The main barker is 100A.
You need to do a load calculation based on the appliances, sq. ft, etc of the building
You say the main is 100? - then its 100A. Are you looking to change the breaker to something larger? What are you looking to accomplish? The original wire size and insulation if rated for over a 100A may be the limit in this case - if looking to change both the breaker (MOCP), and SECs you may have to do some more research on what make, and model you might have. The breaker 'should' give you a clue to the make - start there... As for max branch - I have seen several at 80a for either one side of a stab or combined both.How can I figure out the limit of the main-panel. The labels are destroyed. The main barker is 100A.
I have worked on 100A Murry main panels that stated maximum branch circuit = 50A. I believe this limitation is not related to ?load calculations?.
What make and type of panel? Many of the older BR styles like Westinghouse, CH, Bryant don't have max sizes in excess of the total panel rating in the larger sized panels or main combo's - but some do.... On the same note a lot of the smaller sub-like panels like say a 12/24, or an 8/16 would have a greater chance of having a limit of 80A usually, only from memory have I noticed possibly one or two with a 70A or 50A limit on a BR style - but FPE would have a 50A limit most likely. Never noticed a branch max on a SqD QO, and am sure I have not seen one on any QOB, or other bolt-on type panel of any make.Thank you all. I think my question is not clear. I always read the main panel labels before adding any branch breakers. Many cheep main panels I have worked on state a maximum branch breaker rating of 50A. I believe this limitation is due to the breakers socket maximum amperage limitations.
I want to add a 60A branch circuit but the socket rating may only be good for 50A.
My issue is that I can?t read the label so I am unaware of the breakers socket rating.
Thank you all. I think my question is not clear. I always read the main panel labels before adding any branch breakers. Many cheep main panels I have worked on state a maximum branch breaker rating of 50A. I believe this limitation is due to the breakers socket maximum amperage limitations.
I want to add a 60A branch circuit but the socket rating may only be good for 50A.
My issue is that I can’t read the label so I am unaware of the breakers socket rating.