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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42 views

Ground neutral bond screw on a PON main panel

I'm installing a Plug-On-Neutral (PON) main panel. There is a screw with a label indicating that if I need to bond the ground to neutral, tighten to 40lbs. Now I know main panels generally have the ...
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1answer
23 views

How do you accomplish equipotential bonding for an above ground polyester/PVC pool if the filter pump provided is not compatible?

I recently bought a Bestway 15' x 48" above ground "flexible assembly" pool with polyester-type material and PVC-type vertical frame. In Florida,a permit is required for all pools with ...
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1answer
57 views

Can I reuse the aluminum feeder wire when I replace a sub-panel?

I'm rewiring my 1957 house because there was no ground. I have a main panel and a subpanel in the crawlspace that currently only give power to the gas furnace. I want to add the air conditioner on the ...
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44 views

Sub Panel Grounding method

I encountered a condition where a sub panel' s Neutral wirings are on both Neutral bar and Grounding bar, at a 1960' s home, with wirings are Romex and flex conduits. Subject sub panel served as the ...
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1answer
76 views

Grounding for sub panel breaker

We have an old cabin with 4 fuses in the main 60 amp panel, and a sub panel with a handful of breakers. The sub panel is fed by 3 wires instead of the modern 4. The 4 fuses are all wired with 2 wire ...
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2answers
54 views

Grounding 3 wires to electrical box with 2 ground screws

I've installed a metal electrical box. There are 3 cables coming into the box. The standard box only has 2 ground screws. My inspector said I am supposed to have 1 single ground per screw... So, how ...
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2answers
66 views

Is it safe to split a NEMA 10-50 receptacle?

Is it safe to split a NEMA 10-50 receptacle to a range to add a pair of 5-15 GFCI receptacles? Unfortunately, I am currently renting, and the homeowner refuses to allow any work to be done. I have ...
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18 views

Repair for water damage from shower tile in plaster wall

This is my first post and first DIY Repair project. This shower is about 12 years old. At first I noticed a column of increasingly bulging 4-5 tiles near the door of my shower. The other side of the ...
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1answer
64 views

Electrical Bonding of Service Panel After PEX Replacement of Galvanized Pipes

My house was built in 1929 and has gone through many rounds of plumbing/electrical upgrades over the years. I am replacing the galvanized pipes with PEX and I'm confident that I have planned ...
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2answers
61 views

Is the ground resistance meter indispensable when grounding your home?

I'm Brazilian and I need to ground my house, especially because of some expensive equipment I don't want to use without proper protection. By "grounding my house" I mean: provide an alternative path ...
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1k views

Are the grounds and neutrals in this electrical subpanel reversed?

I would appreciate your feed back to help me understand the logic behind Bonding the Neutral and Isolating Ground as shown in the attached pics. Subject sub panel is dedicated to one of four ...
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2answers
23 views

Have four-conductor feed at detached garage subpanel, how to verify the ground?

I'm currently rewiring my new-to-me detached garage. Garage is from the 70's but has a newer Siemens panel (previous owners added a hot tub). The feed from my service panel is a sheathed 4 conductor ...
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1answer
66 views

Setting up transformer for 240 down to 120

I'm using 240 for voltage drop. The load is a receptacle fed from a subpanel. I know the size of the transformer,the fusing I want to use but, need help figuring out how to ground the system. In ...
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2answers
76 views

Intersystem bonding terminal - how direct?

Back before I knew what an intersystem bonding terminal (IBT) was properly called, I had my service entrance put in by an electrician, licensed in 3 states, who never-the-less pulled things I now know ...
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1answer
50 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
267 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
152 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
77 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
97 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
154 views

Are my circuits properly grounded?

I have a Cutler Hammer CH30e panel. On the right side on the panel there is a neutral bus with the a #6 cu ground and a 1/0 Al THW neutral. The bus is also connected to the panel What I find very ...
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2answers
81 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
37 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
55 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
83 views

Where are the ground rods needed?

Drawing attached showing setup.
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3answers
1k 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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71 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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31 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
739 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
282 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
121 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
109 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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214 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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675 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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185 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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160 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
345 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
570 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
104 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
88 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
521 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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58 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
98 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
88 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
466 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
113 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
111 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
1k 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
4k 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 ...