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What Size Sub-Panel Should I Install for My Garage?

How to Install a Sub Panel for a Garage: Where to Begin when Installing a Sub Panel for a Garage, Planning for a Sub Panel, Identify the Sub Panel Circuits, Sizing a Garage Sub Panel, 120 Volt and 240 Volt Circuits, Planning for Future Circuits.

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Installing a Sub Panel for a Garage
Electrical Question: I currently have power ran out to my garage, however it only runs 2 lights and the wiring is old.

Any advice would be greatly appreciated.
Received from Danny a Homeowner in West Frankfort, IL.

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

How to Install a Sub Panel for a Garage

Application: Adding a Sub Panel to a Garage.
Skill Level: Intermediate to Advanced. This electrical wiring project is best performed by a Licensed Electrical Contractor or Certified Electrician and is Not Recommended for Homeowners.
Tools Required: Electricians tools, pouch of hand tools and the various power tools necessary for installing the sub-panel.
Estimated Time: Depends on the type and size of the panel and available access to the project area.
Precaution: Any existing electrical wiring within the immediate area that may interfere with the installation of the sub panel should be identified and turned OFF and Tagged if necessary. Working in an electric panel is dangerous due to arc flash hazards and the possibility of electric shock.
Notice: Installing additional garage electrical wiring and a garage sub-panel should be done according to local and national electrical codes with a permit and be inspected.

Where to Begin when Installing a Sub Panel for a Garage

More about Home Electrical Circuits and Sub Panels

Basic House Wiring Circuits

House Wiring Circuits and Circuit Breakers

This article looks at common 120 volt and 240 volt house wiring circuits and the circuit breakers that are installed identifying the types and amperage sizes used in most homes.
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Home Electrical Circuits

Electric Circuit Listing

The size of the home electrical service panel is designed by calculating the square footage of the home and factoring in the code requirements for the electrical circuits that are required.

How to Install Workshop Electrical Wiring

Work Shop Electrical Wiring

Fully Explained Photos and Wiring Diagrams for Workshop Electrical Wiring with Code Requirements for most new or remodel projects.

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Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

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FAQs Frequently Asked Questions and Comments

2 Responses to “What Size Sub-Panel Should I Install for My Garage?”
  1. Dave Rongey says:

    Hi Murry,
    When the neutral of a 120 volt circuit is lost it is typically due to a bad connection at one of the receptacles, a bad or burnt splice in a junction box, or a burnt connection in the panel where the neutral wire is connected to the neutral terminal strip.
    These are the areas I focus on and then make the appropriate repairs to restore the connection.

  2. murray berkowitz says:

    I think I have an open neutral in one of my circuits. I get a test lamp to light from hot to ground, but NOT hot to neutral. My non-contact detector picks up current in all 3 wires: hot, neutral and bare ground. could a nail have struck the neutral wire behind the wall? I have switched off the circuit breaker at the panel since I believe this is an unsafe condition, but i need help in trouble shooting this further. I’ve never encountered this before.