Grounding an Electrical Panel
|By Dave Rongey - Summary:
How to Ground a Electric Circuit Breaker Panel: Grounding Requirements for Electric Panels, National Electrical Code, NEC Article 250, Grounding a Main Panel, Grounding a Sub-Panel, Electrical Grounding Methods.
Guide to Grounding Requirements for Electric Panels
- I have a GE 125 amp panel.
This electrical wiring question came from: hector, a Handyman from St. Cloud, Florida.
Additional Comments: Its a very helpful site.
Thanks for your electrical wiring question Hector.
How to Ground a Electric Circuit Breaker Panel
Skill Level: Advanced – Licensed Electrical Contractor, Not Recommended for Homeowners.
Tools Required: Electricians Pouch of Hand Tools.
Estimated Time: Depends on the extent of the project, the panel make and model, and the grounding method to be used.
Precaution: If the only ground source for the electrical system will be removed or modified then the electrical service should be shut off until the new ground source can be reconnected.
Notice: Making changes to the Electrical Service Panel should be done with a permit and be inspected.
Grounding Requirements for Electric Panels
PLEASE NOTE: This question did not state if the GE 125 amp panel is a main panel or a sub panel, which makes a very big difference with the grounding method as outlined below:
- When Grounding an Electrical Panel the following applies
- Grounding a Main Panel
- The ground bar is bonded internally when an external bond to earth is installed as described at the link for Electrical Grounding below.
- Grounding a Sub-Panel
- Sub-Panels are grounded through the cable that provides the sub-feed circuit power.
- This sub-feed cable will have 2 insulated power conductors, 1 insulated neutral conductor and one ground wire.
- The ground wire is bonded at the main panel to the ground system.
- The sub-feed wiring type and size will depend on the specific application and the applicable local building codes.
- Grounding a Main Panel
Electrical Grounding Methods
- National Electrical Code, NEC Article 250.5 Grounding and Bonding
- All grounding electrodes that are present at each building or structure served shall be bonded together to form the grounding electrode system.
- National Electrical Code,NEC Article 250-50 Premise’s Electrical Service
- A premise’s electrical service shall be connected to a grounding electrode system consisting of a metal underground water pipe in direct contact with earth for 10 feet or more, if available on the premises, and a supplemental electrode (a rod, pipe, or plate electrode.) An additional electrode shall supplement the buried water pipe electrode.
More about Electrical Grounding Methods
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.
For more information about Grounding
Electrical Codes for Grounding
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all projects.
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