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Add a Panel to an Existing Electrical Panel


By Dave Rongey - Summary:

How can I wire a shed panel to a garage panel? How to Calculate the Electric Circuit Load of a Sub Panel, Understanding the Circuit Capacity of a Garage Sub Panel.

Wiring to an Electric Panel

Electrical Question: How can I wire a shed panel to a garage panel?

Any help greatly appreciated.
I know how to wire it but not sure its a safe and good idea.

This electrical question came from: Ellis, a Homeowner from Rixford, Pennsylvania.
See more about Home Wiring for Pennsylvania

Dave’s Reply:
Thanks for your Electrical Wiring Question Ellis.

How to Calculate the Electric Circuit Load of a Sub Panel

Application: Installing a Circuit to a Garage Sub Panel.
Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrical Contractor.
Tools Required: Basic Electricians Pouch Hand Tools, electric drill,  auger bits and extension cord.
Estimated Time: Depends on personal level experience, ability to work with tools and install electrical circuit wiring.
Precaution: Identify the panel power source, turn it OFF and Tag it with a Note before working with the new circuit  wiring.
Notice: Installing additional circuits and electrical wiring should be done according to local and national electrical codes with a permit and be inspected.

Understanding the Circuit Capacity of a Garage Sub Panel

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2 Responses to “Add a Panel to an Existing Electrical Panel”
  1. Dave Rongey says:

    That is correct Forrest, the loads of the entire electrical system must be evaluated to understand if there is ample capacity for the proposed load to be added.
    Thanks for sharing your comment about adding a panel,
    Dave

  2. Forrest BRown says:

    If I understand the question correctly, this would be a sub sub panel from a sub panel fed from a main panel. The capacity of the entire system needs to be evaluated. The following is a quote from your sub panel link:

    “Important Factor: Find out if the Main Service or the Panel that will supply the Sub-Panel Circuit have adequate Load Capacity and space for the needed circuit breaker.”

    This would obviously include any panels fed from the sub panel.

    I don’t want to sound pedantic, but I think it is worth noting.