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Installing a Sub Panel for a Detached Building

Do I need to run a ground wire for a 200 amp sub panel that is 200 feet away from the main panel? Grounding a Remote Sub Panel at a Detached Building.


Grounding a Sub Panel at a Detached Building
Electrical Question #1: Do I need to run a ground wire for a 200 amp sub panel that is 200 feet away from the main panel?

This electrical wiring question came from Dennis, in Placereville, California.

Electrical Question #2:

What is the proper way to run an electrical supply to a sub panel in a barn or outbuilding?

This electrical wiring question came from Chris, a Handyman in Johns Creek, Georgia.

Dave’s Reply:
Thank you for your electrical wiring questions.

Grounding a Remote Sub Panel at a Detached Building

Application: Installing a Sub Panel for a Separate Building.
Skill Level: Advanced – Licensed Electrical Contractor – Not Recommended for Homeowners.
Tools Required: Electricians pouch of hand tools and the various power tools necessary for the specific method of electrical service installation.
Estimated Time: Depends on the type of panel, the location, and available access to the project area.
Precaution: This is an extensive project. Working in an electric panel has possible arc flash hazards and should be performed by a Licensed Electrical Contractor.
Notice: Installing an Electrical Service Panel must be done according to local and national electrical codes with a permit and be inspected.

Grounding a Sub Panel 200 Feet from the Main Panel

Electrical codes and information that should be considered when installing an electrical sub panel at a remote building.

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Wire It Right with the help of my Illustrated Wiring Book

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


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