How to Install a Sub Panel for an Attached Garage
Planning and Installing a Garage Sub Panel: I want to add a panel to my attached garage, what size breaker do I need?
Sub Panel in an Attached Garage
Electrical Question: I want to add a panel to my attached garage, what size breaker do I need?
- I have 200 amp service to my home at an outside panel that feeds into the home. I want to add a sub panel to my attached garage.
- The main is about 35 feet from where I would locate the sub-panel inside garage wall.
- I would run the 6/3 cable w/ground through the basement ceiling and through sill box into garage so it’s all indoor wiring.
- I have 2-15 amp circuits that currently feed a garage finished area for lights and workout equipment.
- I would like to pull these from the main and run them from the sub-panel along with a 240/30 amp feed for a heater that will run at 4000 watts and a separate 20 amp circuit for wall receptacle for a fridge.
- I may add a separate 20 amp circuit for wall receptacle in the future for tool use.
- The existing outlets are GFCI protected.
- My questions about installing the garage sub panel are:
- What size breaker do I need at the main to feed the sub ?
- Is 6/3 cable w/ground large enough to handle the loads?
- Does the new breaker at the main need to be GFCI to protect the 240 heater circuit?
I plan on #10 to feed the heater from the sub, #12 to feed any 20 amp circuits from the sub and the 2 15’s I’ll be switching to the sub are currently 14-2 NMB. Am I missing anything? I’ve wired simple circuits from the main before but this will be new for me. I have some knowledge of electrical circuits as my father was an electrician but he is now disabled from a severe stroke and find myself in need of help to make sure I’m not doing anything that would compromise my family’s safety.
This electrical question came from: Vince, a Homeowner from Longmont, Colorado.
Additional Comments: This is a great site for safe wiring advice.
Thanks for your electrical question Vince.
Installing a GarageĀ Sub Panel
Application: Adding a Sub Panel.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrical Contractor, Not Recommended for Homeowners.
Tools Required: Electricians 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 electrical wiring and a sub-panel should be done according to local and national electrical codes with a permit and be inspected.
Planning a GarageĀ Sub Panel
- IMPORTANT: Before Installing a Garage Electrical Panel Consider the Following:
- Identify the Circuits You Need
Before installing a panel the loads must be identified, or at least the size of the panel must be determined.
- Check the Main Panel
Make sure the service panel that will supply the sub panel with the circuit has the amperage capacity and space for the additional circuit and breaker.
- Select the Wire Type and Wiring Method
Specify the type and size of electrical cable that will be used to get from the service panel to the sub panel.
- Check the Wiring Path
Identify the path that will be used to install the electrical cable from the service panel to the sub panel.
- Outlets and GFCI Requirements
Typically the circuit supplying the sub panel in an attached garage is not required to be GFCI.
- Electrical Code Compliance
Electrical circuits installed in the garage must be installed and protected by GFCI per NEC code, as it applies to the specific location and use.
- Identify the Circuits You Need
More about Installing a Sub Panel in an Attached Garage
Sub-Panel Electrical Wiring for the Home
Electrical Sub-Panel wiring considerations for the home complete with pictures. Careful planning for your Sub-Panel with immediate and future load considerations will help you understand how to size your Sub-Panel. This information will help as you consider a Sub-Panel and its size.
Main Service Panel
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.
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.
Electrical Wiring Protection using Circuit Breakers
A guide to home electrical circuit breakers and how they work to protect your electrical wiring. When properly installed, your home electrical wiring is protected by a circuit protection device.
Electrical Wire for the Home
Complete listing of electrical wire types and parts used for home projects with electrical code information serves as selection guidelines.
Basic Home Wiring Diagrams
How to Install Garage Electrical Wiring
Garage Electrical Wiring
Fully Explained Photos and Wiring Diagrams for Garage Electrical Wiring with Code Requirements for most new or remodel projects.
|« Splicing Electrical Wires Safely||How to Pass an Electrical Inspection for Recessed Lighting »|
Browse other questions in the following categories:
Garage Electrical Wiring
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
See more about Electrical Wiring in Your Local Area