Do I have to connect the grounding electrode at a detached garage to the grounding electrode at the main structure?

LOST NEUTRAL SHOCKS HOMEOWNER - CONTENTS: Case history of a neutral wire failure (grounded conductor wire), improper joining of neutral and ground wiring in a sub panel, burning-up electrical ground wires, and a homeowner who received a nasty electrical shock.Photographs of electrical sub panel mis-wiring, overheating, and shock hazards. How to inspect the electrical ground system: wires, grounding conductors, connectors, ground rods. Why Do Electrical Power Surges or Lightning Strike Current Go to Ground While Short Circuits Follow a Path to the Utility Ground? POST a QUESTION or READ FAQs about neutral wire troubleshooting: what can happen when the neutral connections are lost or weak at a building? REFERENCES

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Lost neutral wire - lost grounded conductor wire:

Lost neutral or weak neutral wire electrical connections at a...

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I know this isn't the general kind of question asked here, but I figure it's worth a shot.

We bought an older house, and the house is grounded normally.
At some time, someone ran electrical wires to the garage, which is about 80 ft away.
2 wires, run from the breaker, to the garage roof, no grounding wire.
The wiring in the garage is all wired in for a ground wire, but the main junction box obviously doesn't have one, so nothing is grounded in there.

The 2 old wires looked old, and in fact looking closer, I think someone used old clothes line for wire. The plastic coating is chipped off in several spots, so I decided to run some new wires underground.

I utilised some wire I had sitting around, it's really thick multi strand wire from a solar project a few years ago. 4 conductor, rated 480 volt, and I buried it about 8" deep in 1" electrical conduit.
I know thats not how code says, but I figure it's better than clothesline, and I already had...

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This article explains how to ensure your test and measurement device is properly grounded.

1. Introduction

This article provides general guidelines for installing National Instruments test and measurement equipment that require a connection to the facility grounding system for the purpose of enhancing electromagnetic compatibility (EMC) performance in accordance with the product documentation.

Caution: Local electrical codes typically specify requirements for connecting equipment to the grounding electrode system of a facility. Ensure that your installation complies with all applicable safety requirements. When in doubt, contact a licensed electrician to perform the installation.

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2. Definitions

Equipment grounding conductor: The conductor used to connect the noncurrent-carrying metal parts of equipment, cable shields, and other metal enclosures to the system grounded conductor, the grounding electrode conductor, or both,...
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Hey guys - This is neat, especially the diagrams Stubbie found. A further question about a ground rod in the detached building. In my case the feed is 4-wire (70 ft) from the garage to the house. I'm off grid and originally had the inverter system in the house with a feed to the garage, but then I moved all the panels/batteries/inverters to the garage, in effect switching what was the main vs subpanel.

Question concerns the ground rod at the house (now subpanel). I always assumed it was better to have ground rods at both ends as long as they were tied together. But, years ago, several electricians (and one inspector) told me, no, do not use a second ground rod in the detached structure, so I haven't been doing it. But now I see you guys saying that it's not only a good idea but code requirement. Right? That's 2005 code? Wow, I missed it completely. Thank you. So, I will reconnect the house (subpanel) ground rod this afternoon (keeping neutral and ground completely...

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Background information:

I've done a couple of whole-house re-wires, but have never done a detached garage. I understand the codes for in-house wiring.
I've burried a Rigid PCV conduit between the house and the garage for the wiring.
I've burried a grounding electrode at the garage and have carried it to the sub-pannel in the garage with unspiced #6 bare wire.


I'm confused about how to treat the grounds in the garage. The code books I have are clear that the garage needs its own grounding electrode (which I've done). However, what about the following:

Do I run a ground wire from the in-house ground electrode or water-service to the garage and connect it to the electrode connection there?
Do I treat the garage like any other sub-pannel and issolate the neutral from the equipment ground?


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Please Note: Mike Bee is a non-member guest and is in no way affiliated with InterNACHI or its members.

I have some questions about proper grounding and specs for a subpanel in a shed. Here’s an overview:

Distance from the main panel (at the house) to the shed is about 110’. Using 10/3 wire. At the main service panel = a double-pole 20-amp breaker (two 20-amp breakers with the switches connected). Only using 20 b/c of the long run from panel to sub.

At the shed: Subpanel for 4 circuits, but plan is only for two 20-amp circuits (or a 15 and a 20). Two 8’ ground rods, 6' apart, connected with #6 copper wire.

These are my questions:

1. Grounding at the shed Part 1 - what is the proper connection for the #6 ground wire at the shed? To the neutral buss bar?

2. Grounding at the shed Part 2 - What happens to the ground that’s coming from the main panel (the bare wire in the 10/3 “feed”)? Just leave it disconnected at both ends (at the sub...

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Hi Folks,

I am finishing up with my garage rewire project, and one of the last things to do is to install a grounding system. This is a detached garage, and there are metal pipes (water and gas) underground between the garage and the house.

I pulled a 4 wire feed to the garage subpanel, and separated ground and neutral. I understand that I need a grounding system for the garage. The water pipe satisfies the requirements of a grounding electrode, but I understand that I need a second electrode, if I don't want to try to measure the resistance of the water pipe. So a ground rod is a natural choice.

I also understand the GEC must be continuous, and can only be spliced in complicated ways. My question is about the exact rules of how to install the GEC.

1. May I pull a GEC to the water pipe and the entirely new GEC from the subpanel to the ground rod?

2. May I pull a GEC to the water pipe, and somehow attach another bare copper wire to the first...

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Author Information Topic: GROUND ROD REQUIRED???? Member

Location: NorthCarolina
Title: Maintenance
In Trade Since: 84
Registered: Oct 2000
Total Posts: 20

posted February 27, 2001 at 11:14 AM LOCAL INSPECTOR FAILED JOB. I have a out building I wired. 100 amp subpanel 120 ft. away from Home. Ran 4 #2 al conductors. separated grounds and neutral conductors at the building.Back at the home service entrance there`s a ground rod there.what`s the deal. Do I have to put the extra rod in.
If not please give me the code artical.

Thanks in advance, Mike



Name: Don Ganiere
Location: Illinois
Title: Electrician
In Trade Since: 1973
Registered: Jan 2002
Total Posts: 1061

posted February 27, 2001 at 01:17 PM Mike,
The inspector is correct. If you have a code book...
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