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Electrical Wire and Cable

Adding Circuits to a Sub-Panel

By Dave Rongey - Summary:

How can I add more circuits to a sub panel? I want to add four more circuits to my electric panel box. How to Add Circuits to a Panel: How to Determine the Number of Circuits That Can be Added to a Sub Panel.

Installing Electric Circuits for a Sub Panel

Electrical Question: How can I add more circuits to a sub panel?

Background: Tom, who is a Handyman from Ottawa, Ontario Canada.
Additional Comments: Very Informative!

Dave’s Reply:
Thanks for your electrical wiring question Tom.

How to Add Circuits to a Sub Panel

Skill Level: Advanced – Best installed by a Licensed Electrical Contractor or Certified Electrician.
Tools Required: Electricians pouch of hand tools, voltage tester and protective safety gear.
Estimated Time: Depends on the make and model of the sub-panel and the condition of the existing electrical circuit breakers and the wiring methods.
Precaution: For safety the main circuit breaker should be turned off or any other disconnect means that would turn off the power to the panel before replacing a circuit breaker, however turning off the main circuit breaker may not turn off the power to all of the areas of the sub-panel components and wiring. This is an extensive project that requires experience and should be performed by a Licensed Electrical Contractor.
Notice: Making changes to electric sub-panel or electric circuits should be done according to local and national electrical codes with a permit and be inspected. Geographical Application: All areas of the World and all Foreign and Domestic Electrical Systems.

Determine the Number of Circuits that Can be Added to the  Sub Panel

The Space Capacity of a Sub Panel

Determine the Proposed Circuit Loads for a Sub Panel

The Amperage Capacity of a Sub Panel

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