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Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 7434
Experience:  Proven Professional 48 years Experience
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Electrical question I have a loadcenter 125 MCB but I want

Customer Question

electrical question
I have a loadcenter 125 MCB but I want to remove it and install (1) 100 amp 2p breaker on the bars to be used as main breaker
is it permited by NEC codes?
Submitted: 8 months ago.
Category: Electrical
Expert:  Mike G. replied 8 months ago.

Hi, I'mike G and I'll be assisting you. Yes you may, not a code violation.

Customer: replied 8 months ago.
could you tell me the article just to prevent when the inspector come to inspection?
Expert:  Mike G. replied 8 months ago.

There isn't an article preventing it.

Customer: replied 8 months ago.
where did you get the response?
Customer: replied 8 months ago.
or where it says is not prohibited?
Expert:  Mike G. replied 8 months ago.

There isn't a code article. A change in size of the main to a lower rating on a buss rated higher is not an issue. No code reference

Customer: replied 8 months ago.
I have been doing this for several years
but I wanted to be supported by the Book, because there is a very special Inspector who invent codes
Expert:  Mike G. replied 8 months ago.

I know the type. He should cite the code if there is a violation

Customer: replied 8 months ago.
my last question
what is the maximum voltaje drop permited?
Expert:  Mike G. replied 8 months ago.

3℅ on your wiring 5℅ total yours and the utility combined.

Customer: replied 8 months ago.
I dont understand the 5%
Expert:  Mike G. replied 8 months ago.

Your calculation is for 3℅. If you test for voltage a 5% drop is allowed for the drop from the utility.