asked in category: General Last Updated: 9th April, 2020

# How do you size an electrical subpanel?

Subpanel Circuit Breaker Sizing
To calculate the breaker size, simply divide the adjusted wattage by 240 volts to find the rated amperage needed for your subpanel. Often, the result is not a common circuit breaker size. and you can simply round up to the next higher size of ?the breaker.

Considering this, what size breaker do I need for a subpanel?

Based on your question, since you will be having a subpanel, you want the breaker feeding the subpanel to be sized for the subpanel or slightly smaller. So if you purchase and install a 200A subpanel, then the breaker should be 200A. If you use a 125A subpanel, then use a 125A breaker.

Also Know, how do you measure electrical service size? Inspect the Electrical Meter In many instances, you can determine the size of the home's electrical service simply by looking at the electrical meter outside the house. Look for the point at which the main service wires from the utility company enter the home.

Also asked, what size wire do I need to run a 100 amp subpanel?

A 100 A sub-panel requires a two-pole 100 A breaker - if you want 100 A. You can use #4 AWG 75 deg C or 90 Deg C copper wire in conduit for a 100 A breaker provided the breaker is labeled for use with 75 deg C wire.

What is an electrical sub panel?

The heart of a home's electrical system is the main circuit breaker box, also known as the main service panel. A subpanel is a smaller service panel that distributes power to a specific area of the home or other buildings on the property.

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