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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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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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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2 answers
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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
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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
87 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 (...
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1 vote
2 answers
73 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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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
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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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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 ...
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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 ...
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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 ...
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121 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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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
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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
107 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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2 answers
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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 ...
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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
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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 ...
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1 answer
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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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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
926 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
418 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 ...
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1 answer
95 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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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
233 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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1 answer
100 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 ...
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5 answers
274 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 ...
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2 votes
1 answer
235 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
299 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-...
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1 vote
2 answers
82 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 ...
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1 answer
122 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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0 votes
1 answer
768 views

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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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
329 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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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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1 vote
2 answers
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Conduit / Best practices for a shared ground between branch circuits in residential?

According to NEC 2014 250.130 : Article 250 - Grounding and Bonding VII. Methods of Equipment Grounding 250.130 Equipment Grounding Conductor Connections. Equipment grounding conductor connections at ...
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2 votes
1 answer
101 views

What is the appropriate fitting to connect an armored cable to this stand-alone receptacle product?

I have a pre-existing #6-3 armored cable (without a separate ground conductor), as shown here: I am replacing the range this was connected to, and would like to provide a 4-wire connection via a 14-...
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2 votes
2 answers
179 views

Can I use the metal cladding of a cable as ground for this range installation?

I have a pre-existing #6-3 cable (without ground) with metal cladding on a 50-A two-pole circuit that was wired into a range. As shown in the photo, this cable has only black, red, and white ...
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2 votes
1 answer
261 views

why does my main service electrical panel not have a ground? or is it bonded already?

So im in the middle of installing a mini split in my home and i was about to start the wiring but when i opened up my main panel i realized that i dont have any grounds anywhere.So i started doing my ...
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0 votes
1 answer
397 views

Direct Burial Wire for 200 Amp Sub Panel from 200 Amp Main

I'm trying to get the right info to price out my project. I plan to install a 200 amp sub-panel in a shed with a 125 to 150 amp feeder breaker. The shed is about 180 feet away from the main panel. The ...
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3 votes
1 answer
85 views

Neutral-Ground bonding with generator (no utility power)

I've been doing plenty of searching around the internet, but cannot find anything for my specific scenario. Any help or advice would be greatly appreciated. I would like to install a breaker panel at ...
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5 votes
3 answers
838 views

Is my main panel improperly bonded?

My house was built in 1975 and I pretty obviously have a "Rule of 6" GE main panel (the meter is above this) My father-in-law (who has taught me a great many DIY things) swears that the ...
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1 vote
2 answers
235 views

What is the correct safe way to wire ground in a domestic 110/220 step transformer?

I am not an electrical engineer and do not have a deep understanding of all the different factors in transformer design. My question is about a plug-in 2:1 step up/down transformer used for 120/240 ...
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2 votes
2 answers
1k views

Are generator "bonding plugs" safe and legal?

I've been researching portable generators, and I have learned that models with a floating neutral need to be grounded. Some people say you can bypass this requirement by plugging a "bonding plug&...
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2 answers
80 views

Unused red for ground in existing armored cable?

My house has a lot of older armored cable using the armor for ground. If I'm working in a box and find a three-conductor wire with only black/white in use, and I know where the other end is, should I ...
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3 votes
1 answer
121 views

Is this grounding configuration correct?

While doing work in my breaker panels I noticed the following: 300A service enters into a large box on the right where it is split to a 200A and a 100A panel. Neutral and ground are bonded in the ...
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0 votes
1 answer
164 views

Can I bond my ground to my gas pipes?

Do I have to install the grounding electrode all the way to the service section, or can I bond the gas pipe to building steel which is continuous through out bldg and then bond the steel to the ...
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7 votes
2 answers
634 views

Sub panel install issue

I had a sub panel installed recently. The plan was that i will be installing my own breakers. The sub is running off of the main about 25 feet away in my garage. I understand that the ground and ...
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2 votes
2 answers
136 views

Bonding new communications system to home grounding system

This will be handled by an electrician, but I wanted to get info on what's permissible as my first stab at talking to an electrician led to a conclusion that seems disallowed and unsafe (entirely ...
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