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.Įlectrical Wiring Protection using Circuit BreakersĪ guide to home electrical circuit breakers and how they work to protect your electrical wiring. 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. House Wiring Circuits and Circuit Breakers This information will help as you consider a Sub-Panel and its size. See More about Installing a Sub Panel in an Attached GarageĮlectrical Sub-Panel wiring considerations for the home complete with pictures.Ĭareful planning for your Sub-Panel with immediate and future load considerations will help you understand how to size your Sub-Panel. Typically the circuit supplying the sub panel in an attached garage is not required to be GFCI.Įlectrical 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 path that will be used to install the electrical cable from the service panel to the sub panel. Specify the type and size of electrical cable that will be used to get from the service panel to the sub 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. IMPORTANT: Before Installing a Garage Electrical Panel Consider the Following:īefore installing a panel the loads must be identified, or at least the size of the panel must be determined.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. Working in an electric panel is dangerous due to arc flash hazards and the possibility of electric shock. 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. Tools Required: Electricians pouch of hand tools and the various power tools necessary for installing the sub-panel.Įstimated Time: Depends on the type and size of the panel and available access to the project area. Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrical Contractor, Panel work is Not Recommended for Homeowners. Installing a Garage Sub PanelĪpplication: Adding a Sub Panel to a Garage. Thanks for your electrical question Vince. This electrical question came from: Vince, a Homeowner in Longmont, Colorado.Īdditional Comments: This is a great site for safe wiring advice. 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. I’ve wired simple circuits from the main before but this will be new for me.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.Does the new breaker at the main need to be GFCI to protect the 240 heater circuit?.Is 6/3 cable w/ground large enough to handle the loads?.What size breaker do I need at the main to feed the sub ?.My questions about installing the garage sub panel are:.The existing outlets are GFCI protected.I may add a separate 20 amp circuit for wall receptacle in the future for tool use.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 have 2-15 amp circuits that currently feed a garage finished area for lights and workout equipment.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.The main is about 35 feet from where I would locate the sub-panel inside garage wall.I want to add a sub panel to my attached garage. I have 200 amp service to my home at an outside panel that feeds into the home.Electrical Question: I want to add a panel to my attached garage, what size breaker do I need?
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