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Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 7369
Experience:  Proven Professional 48 years Experience
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What's the easiest way to decide what size breaker to use to

Customer Question

What's the easiest way to decide what size breaker to use to power a subpanel if you know you're not gonna need the full capacity?
Submitted: 9 months ago.
Category: Electrical
Expert:  Mike G. replied 9 months ago.

Hi, I'm Mike G and I'll be assisting you. The size of the feeder determines the size of the breaker.. what size is the wire?

Customer: replied 9 months ago.
The feeder goes to the panel
Expert:  Mike G. replied 9 months ago.

What size is the wire?

Customer: replied 9 months ago.
Lemme try this a different way. I just needta confirm that 30amps is sufficient for 1 tiny fridge, 5 duplex receptacles, 3 small over head lights
Expert:  Mike G. replied 9 months ago.

The loads given should be OK on 30A providing the feeder is at least a #10 wire or bigger.

Customer: replied 9 months ago.
Boom. Totally is. Thats what I figured. Cool thanks!
Customer: replied 9 months ago.
Also....whats code for how to go from feeder wire to branch circuits?
Expert:  Mike G. replied 9 months ago.

Feeder supplies the panel. Branch circuit breaker protect the branch circuits. The way it is calculated is 3 VA a sq ft for general lighting circuits, which includes receptacle outlets in all areas except the kitchen, dining rooms or any food related area. Those areas need 2 each 20A circuits for receptacles. The same for bathrooms, 1 each 20A circuit.

Expert:  Mike G. replied 9 months ago.

The question is answered but not rated yet. Is there anything more you need?