Questions tagged [grounding-and-bonding]

For questions dealing with grounding and bonding of electrical installations, and the specific requirements of such.

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Mounting lug to junction box

I need to bond 10 ga stranded EGC to a metal junction box. I’d like to use something like this lug. The box will be screwed to a floor joist in the crawl space under my house. Does this lug need to be ...
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1 answer
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electrical feed to fish cleaning station

I have a fish cleaning station with a light and a GFCI receptacle. The GFCI feeds the outdoor floodlight that keeps tugboats from running into the pier. Should the circuit be fed by a GFCI breaker. ...
2 votes
2 answers
441 views

Main panel grounding modification (two grounds in box to single ground wire)

My old house’s main panel has two ground wires, one leading to pipes, another to a grounding rod. Because the bottom is the only easily-accessible side for new circuits, and because most of the ...
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8 votes
3 answers
1k views

Upgrading 240v 3 prong dryer outlet to 4 prong

I was going to replace an old 3 prong dryer receptacle with a new one. It being an old townhouse built in the late 60's I assumed there wouldn't be a ground wire, but when I took the outlet out I ...
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5 votes
1 answer
209 views

How is a Ufer ground attached to the panel?

I am planning a addition to my house. I'm not sure of the current state of the house's grounding system (built in the 1890s, last updated in the early 1970's by my estimation, so "minimal" ...
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4 votes
2 answers
82 views

Code re water pipe as grounding electrode

My 200A main panel ground currently goes to the metal water pipe right where it comes into the building. Presumably the pipe was allowed as the only grounding electrode when the system was installed ...
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1 vote
2 answers
71 views

ITE EQ Load Center neutral / ground update

Here’s an update on the main panel neutral issues that I raised originally in another question. I relabeled the photo, and made a diagram to show the problem. This post restates the issue, I hope more ...
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4 votes
2 answers
177 views

Utility requires EGC wire to be bonded in meter can, do grounds and neutrals have to be separated in main panel?

My utility requires a bare #6 wire to run from the the rods to the meter pan and be bonded with neutral. The wire then runs to the ground bar in the panel. I have an old panel with only one bar for ...
0 votes
2 answers
65 views

ITE EQ Load Center neutral / ground questions #2

In the photo below of the top of my main panel, wire A is clearly not in a good spot. Perspective in the photo is distorted, it's actually about 1-1/2" from the mains, but still ... Anyway, at ...
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0 answers
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Generac GP8000e/Need to be grounded? Remove Neutral?

I have a Generac GP8000e generator that I plan on back feeding the main panel of my home with the portable generator, power inlet box L14-30a and breaker. First, I will install an interlock between ...
4 votes
1 answer
520 views

Changing out GFCI disconnect for new hot tub

I purchased a new hot tub. On the current disconnect, using an ohmmeter, I get 0 ohms between the bare conductor and white neutral. I wired the original box and had it inspected but not sure how in-...
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9 votes
1 answer
336 views

What types of conduit would be appropriate to extend a circuit inside a storage bench?

The existing condition has a built-in banquette (bench) with hinged seats so that the interior space is accessible for storage. There is a wall-mounted receptacle inside the bench. Because of the ...
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2 votes
2 answers
399 views

How to ground two circuits in same box without violating neutral bonding

Confused on what to do in this situation, or if there is a problem... here's the setup: I have a main panel and a subpanel. Main has ground bonded to neutral and sub panel has bonding screw removed to ...
3 votes
3 answers
782 views

Is my non-standard outlet box grounding screw code-compliant? (US in 2022)

I'm installing GFCI outlets in my 1950s era existing kitchen counter wall boxes. The metal boxes in the wall have a number of holes in them that I thought were for standard green grounding screws, but ...
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3 votes
1 answer
908 views

Does this "creative" grounding meet 2017 or 2020 NEC?

House configuration: 1950s California ranch style single story with attic. Late 1960s split bus panel with probably 100A service. 120V outlets in house are ungrounded 2-prong. Gas enters house ...
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0 votes
1 answer
84 views

Bonding gas line to electrical Ground

When bonding a gas line to a electrical ground, can the bond to the gas line be anywhere post meter or does it have to be close to the meter?
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3 votes
2 answers
787 views

Should a subpanel in the same building have its own grounding rod?

I'm installing a subpanel on the opposite side of my home. To be clear the subpanel will be attached to the same structure as the main panel (the main panel does have a grounding rod), just on the ...
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3 votes
1 answer
1k views

Bonded neutral generator - connecting to house and removing bond in main panel instead of within generator

When connecting a generator to a house, since it's a bonded neutral generator, I was told that I need to first remove the bond within the generator since there's already a house bond. I was going to ...
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2 votes
2 answers
124 views

Should a subpanel be bonded if it's not grounded to main panel?

I have a subpanel that was installed probably back in the 80s. It has a ground wire running to a local ground rod, not back to the main panel. The ground bar in the panel is not bonded to the common (...
1 vote
2 answers
224 views

Connecting a "Bonded Neutral" in an A/C disconnect

Followup to my earlier question about replacing a sub-panel and adding an A/C disconnect: I'm just taking a good look at the disconnect and I see that it has the two line voltage legs, OK, and another ...
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0 votes
1 answer
204 views

What is the best way for pulling 3- 4/0 wires and bare ground through 2” conduit [closed]

Pulling 200 amp service from meter to panel
0 votes
1 answer
274 views

Do I need to bond and ground where the CSST connects to the metal pipe?

I recently had my gas line moved for my range. The piping was replaced with CSST. If my metal piping is already bonded and grounded near the gas meter, do I need to also have a separate bond and ...
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2 votes
0 answers
65 views

Is there an exception to running a fourth ground wire when upgrading a sub panel

I am upgrading a 1950 homes sub panel from a fuse panel to a breaker panel. It’s is a three wire system running the fuse panel. The panel is down stairs on a interior wall about 50 feet from the main ...
0 votes
1 answer
52 views

Brooklyn subpanel in same building - 3 conductor vs 4 conductor

I live in a recently renovated Brooklyn (NY) building where the service entrance for the main panel comes into the basement and then is fed up to my floor via a backfed panel (100 amp service and 60 ...
0 votes
1 answer
61 views

Light Switch With Unconnected Ground [duplicate]

I am looking to install an Eaton timer switch in place of a single pole switch connected to a bathroom fan. Checking the current decora switch I noticed that it only has two wires connected (hot and ...
1 vote
0 answers
211 views

House built in 2010 - where's the grounding rod?

This is the main panel outside the house (a subpanel is inside the house right behind it). I was wondering where the grounding rods are (I think they've been required by code for a while?), but I can'...
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0 votes
1 answer
430 views

Wiring Diagram for Connecting two 100A sub panels to a 200A main panel

I have an outdoor 200A meter/panel combo box (Eaton MBX816B200BTS). Currently, I have 100A going to my house. I would like to add an additional 100A circuit at the meter panel to provide electricity ...
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-1 votes
1 answer
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How to transform the mains from 110 V to 220 V and do proper grouding for house on limestone rocks near the ocean?

I would like some guidelines and advice on how to transform the mains supply from 110 V to 220 V for an entire house. This means the wall outlets should permanently deliver 220 V instead of 110 V (...
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2 votes
1 answer
175 views

Can neutral and ground be bonded only at a subpanel?

I live in a developing country where there isn't much in terms of electrical codes and electricians often aren't very detail-oriented. I recently had a solar system installed(Victron Multiplus-II –), ...
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0 votes
2 answers
183 views

Ground wire in subpanel

I'm adding a circuit to a subpanel in my garage (built in the late 70s), and I've been reading a lot about subpanel ground / neutral bonding (how it's not supposed to be bonded at the subpanel, and ...
11 votes
2 answers
2k views

I have 11V between neutral and ground, how can I isolate the problem and solve it?

I am in Indonesia and the local electricity company is bad and there is no actual electrician around. People just connect wires together. So with this in mind I recently ripped out my wires (unearthed)...
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6 votes
5 answers
1k views

Risk of bonding neutrals and grounds in sub-panel

I am replacing my complete electrical service entrance (weatherhead, meter box, breaker panel in the house). The meter housing I have chosen is a meter/main combo that will have a 200 AMP breaker. So ...
0 votes
1 answer
69 views

Under what conditions is a subpanel to have a separate grounding rod?

Does a subpanel need a grounding rod when the subpanel is within the same structure as the main panel? Does a subpanel need a grounding rod when it is in an outbuilding? Are there any distance ...
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8 votes
3 answers
1k views

Does my house have a grounding problem?

I've been looking at how my house is grounded because I want to install an antenna outside for amateur radio. After poking around, I'm suspicious something isn't right. I think I'm probably going to ...
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0 votes
1 answer
51 views

I found an old earth ground with #12 wire, should it be changed after a service upgrade?

About 10 years ago we had a new meter-main installed upgrading to 200A service from 100A at a new service entrance location (closer to the street) for a 1951 daylight ranch house. At the time they ...
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2 votes
2 answers
2k views

How do I ground an AC inverter in a RV?

I am working on installing a Victron Energy Phoenix Inverter 800VA into my little teardrop RV. I am doing something men just don't do, I read the Victron Energy Phoenix Inverter manual! Appendix A ...
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3 answers
820 views

Adding Transfer Switch to Main Breaker with no available ground/neutral spots on bus

I am installing a 10 circuit reliance manual transfer switch. I need to install the ground to the ground bar and the neutral to the neutral bar. However, both grounds and neutrals are mixed in my ...
0 votes
1 answer
171 views

Grounding recommendation at a remote receptacle/ground rod?

My home was built in the 1930s with knob and tube wiring. The previous owner(s) replaced or augmented it, a bit at a time, and when I purchased the home from the last one he said that there was no ...
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0 votes
2 answers
947 views

To use any generator with the house inlet, may one leave the generator ground wire unconnected in the inlet?

tl;dr: To facilitate using any generator with the house inlet, regardless of transfer switch type or generator neutral-ground-bond status, may one leave the generator ground wire unconnected in the ...
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1 vote
1 answer
553 views

Grounding Rod Requirements (Canada, Ontario)?

Been reading up on grounding requirements in my region, but am rather confused about the 2015 code. Rule 10-700 of the Canadian Electrical Code states that Rod electrodes must consist of at least two ...
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2 votes
1 answer
173 views

Do pipes need to be bonded to GEC within 5 feet of entry?

I received a competitive quote from an electrician to upgrade my home's service. He wanted to know where the water and gas lines entered the house because he said they needed to be bonded to the GEC ...
0 votes
5 answers
286 views

How to upgrade apartment's power grid to protect my electrical devices

I'm not at all an expert in electrical engineering so I'll try to do my best of explaining my issue. I live in Finland and I own an apartment that was built in the 80's. There has been some ...
2 votes
1 answer
376 views

Should the grounds and neutrals be isolated in this subpanel?

I have a main disconnect panel outside by my meter. I've got the two hot legs, a neutral and a ground wire from a ground rod below the meter coming into the panel. The neutral and ground wires are ...
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1 vote
3 answers
506 views

Need help resolving open ground in 3-way switch circuit

I have wired a new circuit in my house that is an outlet controlled by 2 3-way switches. I intend to plug a chain of 4 LED shop lights into the outlet. I have run 14/2 from the panel to the first 3-...
1 vote
2 answers
122 views

Ground-neutral impedance

In the US electrical system, as I understand it, the ground and neutral wires are connected (bonded?) together at someplace. In the past, the location of the neutral bonding was a matter of local ...
0 votes
1 answer
201 views

120v from 240v with a transformer

I have 240v over Hot-Hot-Ground which is feeding to a sub-panel for a pool. Sub-panel will have a 30amp 2-pole breaker for the pool pump and a 15amp breaker for the lights. I need 120v for the pool ...
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1 answer
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Should my new service panel be bonded?

I am upgrading an obsolete Sylvania panel located inside the house. There's a main panel outside the garage with the main 150 amp breaker. I have a supplied bonding screw with the new panel. ...
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0 votes
1 answer
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Can a 20' section of #4 rebar server as concrete-encased electrode ( UFER ) if it is not attached to the rest of the rebar matrix in an on-grade slab

Let's say we have 9'x25' monolithic concrete slab of 5" thickness with a 12" deep by 12" wide "haunch" footer around the perimeter. At 2-1/2" inches below the surface of ...
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1 vote
1 answer
656 views

Does the ground wire need to be continuous through the termination block?

I need to re-route where the ground wire goes through the exterior wall. From the panel, it is run continuous through a termination block (picture below), through the exterior wall, then out to the ...
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1 vote
0 answers
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Grounding Metal Garage with Subpanel

For the subpanel I am installing in my metal garage (concrete floor), I have sunk an eight foot copper-coated rod next to the outside wall and adjacent to the panel which is on the inside of the ...
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