Grounding an Electrical Panel
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
[ad#block] Electrical Question: How do I ground a breaker panel to the ground bar.
- 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.
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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.
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Electrical Codes for Grounding
Electrical Grounding Methods and Requirements
Listing of electrical codes for grounding with examples of electrical grounding codes for home electrical wiring.
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I have installed a 125 amp sub-panel, serviced with #2 stranded copper. I have a grounding rod implanted for use as a supplemental exterior ground.
1. Can I use left over #2 insulated stranded wire for this ground? or, must it be exposed solid copper? (# 4 or #6)
2. Can the ground wire be spliced?
3. Can I attach other ground wires to the grounding rod, or must it be used only for the sub-panel?
Please refer to the Electrical Code section of this website for sizing your sub panel ground wire.
A ground wire may not be spliced, but must be continuous.
Attaching other wires to the ground rod would depend on what the system may be and how it is connected.
I hope this helps,