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: Do I need to run a ground wire for a 200 amp sub panel that is 200 feet away from the main panel?
- My question is about Grounding a Sub-Panel: I am installing a 200 amp sub panel to an existing structure that is 200 plus feet away from the main panel.
- The structure has a uffer ground rod installed, (20 foot rebar tied to the main slab / footing rebar) and I can install secondary grounded rod as well outside.
- Question: can the structure stand alone with its own grounding system? or do I need to run a ground wire back to the main panel.
- I am Using 2/0 copper wire in PVC conduit buried to get from the main panel to the structure.
This electrical wiring question came from Dennis, in Placereville, California.
Thanks for your electrical wiring question Dennis.
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.
- The Grounding System for a Separate Structure
- A ground wire is not required in the conduit that is feeding power to the panel at the separate structure.
- A GES, Grounding Electrode System must be provided at the separate structure for the sub panel.
- Grounding electrode conductors for the remote panel must be sized per NEC Table 250.66
- As per NEC Article 250.32-B-1 – Do Not install a bonding jumper to the neutral bar. Make sure to isolate the grounds and neutrals separately.
- NEC Article 225.31 – A main breaker must be installed if there are more than six circuit breakers in the sub panel.
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