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Electrical Wire and Cable

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.

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

Where to Begin when Installing a Sub Panel for a Garage

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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.
Electrical Panel Circuit Listing

Home Electrical Circuits

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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.

For Best Results Consult a Licensed Electrical Contractor.
Locate An Electrical Contractor in Your Area

» You Can Avoid Costly Mistakes! «

Here's How to Do It:
Wire It Right with the help of my Illustrated Wiring Book

Great for any Home Wiring Project.

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Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handywomen, and Electricians
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.

Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

Electrical Tip

The Safest Way to Test Electrical Devices and Identify Electric Wiring!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester, [amazon.com], I use for the detection of Standard Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

« GFCI Outlets and Aluminum Wire Sure Signs of Electrical Trouble with a Light Fixture »

FAQs Frequently Asked Questions and Comments

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

    • 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.


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