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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1answer
49 views

Bare neutral to subpanel in detached garage

I have an old house with a detached garage. There is power to the detached garage through a 3-conductor cable that is routed above ground. Power from my house comes from the power pole, to my house. ...
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41 views

Momentary 'brown-out' when a motor kicks on

As a home owner, I have an ongoing issue which is that everytime any motor kicks on (refrigerator, AC condenser, sabre saw, etc.) the lights dim for a second or two. The main service is at the ...
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2answers
51 views

Can I bond gas plumbing via gas water heater's electrical connection ground?

Locale: WA State, U.S. Inspector approved gas plumbing and followed up later, saying: "Please note that we will be verifying the bonding of the new gas piping at the next inspection, please ...
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1answer
339 views

Grounding tv antenna in attic?

I know this question has been raised all over the internet, with a variety of responses, but here is my specific situation: I purchased this antenna and plan to mount it in my attic. I have an indoor ...
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2answers
63 views

Can I run a new circuit in the same conduit as ground cable?

I had a 100 A sub-panel installed in my garage. The electrician used an LB and conduit stub to bring the ground cable outside into the ground -- the cable is 4 AWG, stranded, in 1/2" schedule 80 ...
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2answers
466 views

Replacing subpanel that was fed with 3 wires

A contractor replaced my subpanel with a new one, and will come back for other work and inspection. (Old subpanel is Federal Pacific.) My home is in California, built in early 1980s. The subpanel is ...
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2answers
146 views

Mixed conduit grounding code

I'm running a few outlets to my basement from the main panel on the first floor. Since it is a garage, sealed 3/4" pvc conduit runs through the concrete into the basement. This connects to a ...
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1answer
55 views

Can multiple grounding electrode conductors be placed on the same ground lug?

Couldn't find anything in the NEC 2017 that forbids it, but wanted to double check: Can multiple grounding electrode conductors (thick multi strand is the outside-ground-rod wire, thin single 6GA is ...
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1answer
59 views

QO Main Service Panel - Ground lug question - CT resident

I have a fairly new QO main svc panel (QO142M200PCAFVP) which is being used as a service panel (bonded, not a sub-panel). The green screw (top right) bonds the panel appropriately. The main 3 ...
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2answers
65 views

Voltage between breaker box and earth

I recently bought an older (1920) house. The wiring was upgraded ~20 years ago. The breaker box is on the back porch. Circuits run though conduit to the floor of the porch, however the conduit ...
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3answers
51 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
34 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
79 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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2answers
49 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
95 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
95 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
71 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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34 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
116 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
63 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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3answers
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
28 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
81 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
139 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
53 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
438 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
158 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
119 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 ...
15
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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
117 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
168 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
123 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
38 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
57 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
86 views

Where are the ground rods needed?

Drawing attached showing setup.
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3answers
2k 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
126 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
37 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
1k 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
777 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
180 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
124 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
324 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
1k 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
204 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
209 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
550 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
1k 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
125 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 ...