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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40 views

Ecuador grounding an ungrounded house

Hi so I’m an electrical engineer visiting some family in Ecuador and after some wiring has stopped working In the kitchen I have decided to rip out the 40 plus year old installation and reinstall. ...
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2answers
182 views

How should a sub panel be grounded if next to the main breaker?

How should a sub-panel be grounded if next to the main breaker? Do the ground and neutral need to be isolated (separated) from each other in the sub? Sub-panel will be about 6 - 8 feet away from the ...
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1answer
127 views

Understanding ground to earth and neutral, trying to make my home safe

I've been reading for hours and still confused in regards to my situation. I'm trying to improve electrical safety in my house, especially with a growing family. Any help would be great. I'm in ...
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3answers
51 views

Grounding TV Antenna and Metal Porch, And Resolving Ground Rod Issues

I'm mounting a light-weight metal TV antenna to a metal mast attached to old-school metal roof columns (with the curly-cues) on a small second floor porch which has a metal porch roof, and metal floor ...
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1answer
2k views

Is this box bonded properly to the ground?

The receptacle is from the mid-1950's and my multimeter shows that it is grounded. There are a solid 120 volts when testing between live and ground. I noticed a bare copper wire coming from the cloth ...
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4answers
85 views

Can you have neutrals on ground bar only bonded through main panel body

I have just added a circuit to my main panel and saw something I wanted clarification on. For reference, my main panel is a Homeline 30 space panel with 2 extra grounding bars on the sides. Picture ...
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1answer
132 views

Are my circuits properly grounded?

I have a Cutler Hammer CH30e panel. On the right side on the panel there is a neutral buss with the a #6 cu ground and a 1/0 Al THW neutral. The buss is also connected to the panel What I find very ...
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2answers
63 views

Bonding CSST to electrical ground system

I had a licensed natural gas tech/plumber install a new branch line using CSST to a new fireplace. When I am asked him about bonding it, he said he had never heard of that before. From everything ...
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1answer
36 views

Drawbacks of Bonding Earth & neutral in Industrial sub panels

Bonding of Earth and neutral in machine subpanels will causes problem, but I want to know how it would affect PLC & VFD, etc. The machine has 2 panels one for heaters (uneven load in each phase) ...
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1answer
54 views

Floating Ground in Renovated Bathroom

I am a homeowner and retired RF Engineer, not an electrician. We bought a house built in 1955 that we have been remodeling in stages over the past five years. The first thing I had done was to ...
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1answer
81 views

Where are the ground rods needed?

Drawing attached showing setup.
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3answers
625 views

2 load centers under 1 meter: do you need bonding and main breakers at both?

Here's my layout as it stands: meter | 200A disconnect, neutral and ground bonded | | | mobile home main panel (200A main breaker, neutral and ground not bonded) I would like to run another 100A ...
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2answers
52 views

Can a grounding conductor from equipment terminate in a metal box grounded via EMT?

I have EMT leading to a metal junction box, and from that box goes plastic liquid tight to some equipment. Currently I have a ground conductor running all the way back to the panel, but I'm wondering ...
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3answers
3k views

Can ground attached to neutral fool a receptacle tester?

I'm using a basic outlet tester like the one from picture below. Let's say someone wired the ground to the neutral in some outlet, to provide a fake ground. What would the tester report? Would it be "...
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0answers
28 views

Detached garage with a 3-wire feeder

This house is being sold, a home inspection has noted that the neutral and branch circuit ground wires are landed on the same bar in the sub panel at the detached garage,it is feed with 3 wires from ...
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2answers
329 views

My outlets have ground wires twisted together and bonded to the metal box, but not the outlet. Is this ok?

In my home, I've been replacing the outlets. The old ones are so loose that things don't stay plugged in! While doing this, I noticed that the ground wire(s) in every outlet are twisted together and ...
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3answers
118 views

Grounding Requirements for same structure subpanel

I understand that unless a 250.32(B) (NEC 2014) applies, a separate ground wire should run from the main to a subpanel where the service is in a separate structure. Still confused however about NEC ...
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1answer
64 views

Adding pool heater to bonding of pump, salt generator, and timer

I just recently installed a heater and on the bonding lug my installer ran a green wire back inside the heater to the metal. I could have sworn that they were supposed to run a wire from the bonding ...
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2answers
97 views

IBT and whole house transfer switch

The inter-system bonding termination (IBT) is where other services like telephone and cable TV get their ground bonds from the house's grounding electrode system (ground rods). 2014 NEC (NJ) 250.94 ...
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2answers
151 views

Why do you have to bond the neutral and the ground wire in the main panel? [duplicate]

Why do you have to bond the neutral and the ground wire in the main panel? Not in separat ?I don't know how that works
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2answers
323 views

GE Powermark Electrical Panel - What Did the Last Guy Do?

Basically, I want to do two things - add two dedicated circuits for the garage shop and add a 50 amp 240 breaker for my welder. I've been reading for days about what is going on inside my panel (GE ...
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2answers
142 views

3 wire existing feed, not connected to main panel. Do I bond ground and neutral

I have a detached garage that has a 3 wire feed, powered from a separate 100amp disconnect from the main panel. Originally the old box had the ground and neutrals together on the same bar. I ...
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0answers
114 views

Do I need to ground a service disconnect

I installed a double-pole, double-throw 100A service rated disconnect off of a 100A breaker just after the meter to my home. It uses a non-switched neutral buss. I also installed a 50A power inlet on ...
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1answer
213 views

Should I connect the ground wire to the panel when the conduit is grounded?

I ran 10/3 BX cable to my attached garage for an outlet. The BX has its own green wire for grounding, but since my home is grounded all through the conduit/outlet boxes and is bonded to the neutral in ...
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1answer
223 views

Three wire vs four wire feed remote sub panel

I added a drawing. of both wiring configurations. The only advantage I can see is the 4 wire gives you a dedicated ground fault circuit vs sharing the neutral wire. Open neutral between the two ...
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1answer
88 views

Electrical Bonding for an exterior building

I have to upgrade the service I have for an exterior building. The wiring follows the old code, and I'll need a permit to do it. So I am going to have to update the service and everything to the ...
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1answer
70 views

Adding sub panel - detached building

This is the first one I've done and want to make sure it's correct.. 200amp in the house 110amp breaker to subpanel 2/0 aluminum wire 140' URD 4 bare copper ground less than 6' 8' aluminum ground rod ...
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1answer
306 views

Bond CSST to Water Pipe - Allowed in 2017 NEC 250.104(B)?

I am looking to bond out CSST gas line which is in our crawl space of the house (dirt floor) and the copper water pipe is close by. I was wondering if CSST can be bonded to the copper water pipe in ...
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0answers
56 views

How to correctly ground long distance from main disconnect to first panel

I've got a property with an existing very sluggish electrical installation which consists of a service drop at property entrance, no main disconnect and a 130' underground run to the living space (...
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1answer
84 views

What's the proper way to bond metallic signal wiring raceway?

I have a stud cavity through which I need to run some signal wiring that's sensitive to ingress noise. An industry-standard recommendation is to run the wiring in properly bonded metal conduit (...
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0answers
79 views

Bathtub pump motor - ineffective ground through water pipe?

I opened up the space underneath my bathtub for the first time in this house. The tub is a "spa" style and has a pump motor to circulate water through jets. (I'm in NY / USA). I noticed that the ...
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2answers
317 views

Bonding new ground wire from ground rod to exsiting house grounding block

I am installing a new external TV antenna on the back of my house. The house grounding block is about 100 ft away from the new antenna, around the other side of the house. There is an existing ...
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1answer
103 views

Alternatives to pig-tailing ground wires in outlet box?

I have an old house and there are ungrounded outlets set in the baseboards. I am currently working on rewiring them and was wondering what the best way to tie the ground wires to each other and the ...
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1answer
90 views

Do AFCI/GFCI receptacles protect downstream circuits without equipment bonding conductor?

I am renovating part of my house, and taking the time to update some old wiring that is now exposed. The old wiring is primarily #14/2c WITH NO BARE BONDING CONDUCTOR. This means that no device ...
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3answers
824 views

Replacing grounded outlets with grounded metal junction box

Replacing several 3 prong outlets in my 1968 home. Tried searching to find an answer but most questions seem geared towards replacing 2 prong outlets with 3 prong and don't apply here. My wiring ...
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1answer
2k views

Ground size for 100 amp sub panel 200ft away

I would like to install a 120/240 volt 100 amp sub panel on a detached garage that is about 200 ft away. I have read that one should strive for a voltage drop of less than 3% and from what I can tell ...
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1answer
70 views

Should I bond pipes to ground in detached building subpanel?

In California. My subpanel has a dedicated ground conductor run to it (ground and neutral bonded only at the main panel). The subpanel is in a building with its own plumbing, not connected to pipes ...
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2answers
198 views

External TV antenna grounded inside attic?

I want to install an OTA external antenna to an existing satellite dish mast, I have removed the dish and plan on just attaching the antenna. The existing dish mast was never grounded, there are also ...
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2answers
100 views

Does the ground wire for my pool connect to the pumps?

I am in the midst of a new gunite in-ground pool install. I have the electrical background to tackle this job but I want to know I have it right, particularly around the bonding and grounding. I got ...
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1answer
57 views

Intersystem grounding bus ran out of terminals; now what?

My intersystem grounding terminal bus is out of available terminals, and I have two additional communication wires to ground to it. Does NEC allow supplementary bus bars? NEC 250.94 seems to imply no, ...
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1answer
84 views

Can I run just one wire to the sub-panel via schedule 40 separate from the others?

I have a 25 year old recalled sub panel, three wire, converting to new Eaton 100A. Want to add a wire to meet code Is it allowed by code to run just one wire to the sub panel via schedule 40 to the ...
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1answer
115 views

Should I bond neutral to ground in a three-wire service when adding new branch circuits?

I'm adding 2x20 Amp circuits to a main panel outside, but the main has 3 wire system. Also the main has 6 spaces for circuits, which allows me to add this circuits. The problem is the 3 wire system. ...
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2answers
175 views

Why doesn't current return via the grounding conductor when it's connected in the panel? [duplicate]

Since the neutral wire and ground wire are connected in the main fuse box then why doesn't some of the returning electricity flow through the ground wire to earth?
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2answers
3k views

200amps service - ground rods instead of pipe connection

I upgraded my main circuit breaker today from 150amps to 200amps. See my previous posts here on the same project: Is RC2040M150CH MSP upgradable to 200amps main circuit breaker Neutral on main ...
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2answers
645 views

How can I connect a new ground rod?

Illinois house, built 1963. Not sure if there is a ground rod or just the water pipes used for ground. Want to put in another/first rod. Can I connect it to the clamp on the electrical meter housing ...
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1answer
302 views

Adding sub panel, odd main panel configuration

I am in the process of adding a sub panel to a detached garage and I have the proper gauge wire connected up to the sub panel (neutral and ground NOT bonded) with 3 conductors + ground running in ...
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1answer
330 views

3 Phase Grounding

My warehouse is in an industrial complex. Our building has 6 units for 6 unique tenants. There is one meter room where all the meters are located as well as a 1600 amp main disconnect. Service comes ...
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3answers
16k views

How to connect grounding wire to gas pipe for 2017 NEC 250.104(B)

I'm trying to interpret and apply the 2017 NEC bonding requirements from 250.104(B) to my existing home gas line. I've read this related question to determine I should use #6 AWG wire, but I'm unsure ...
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1answer
156 views

How to run 10 AWG ground wire along basement wall?

What would be a sturdy and efficient way to mount a single 10 AWG solid core ground wire along an unfinished concrete basement wall (connectors, fasteners, etc)? I'm connecting a server rack ground ...
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1answer
304 views

Adding ground to replacement sub panel

We recently purchased a new home that has a 16 x 30 steel building in the back yard approximately 100ft from the main panel. The building has power run to it off a 60 amp breaker in the main panel. ...