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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63 views

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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1answer
273 views

Receving 120 and 220 volt readings when testing a home outlet

I recently redid a room in my house (older home built in the 60's i believe). I decided to replace the outlets as well as they where loose and wouldn't hold plugs very well. When i pulled a few of the ...
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2answers
96 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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1answer
65 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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2answers
118 views

Can I use an existing Ground Rod for Sub-Panel in Detached Garage (Meter box is using the rod currently)

Two buildings: Home and Detached Garage (circa '04 US). Service comes in through a Meter on the Garage to a PVC conduit into the Main box in the home (Single phase 240V with Neutral). In the main box ...
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1answer
78 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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1answer
43 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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1answer
40 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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1answer
115 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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3answers
761 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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3answers
3k 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
75 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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1answer
124 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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2answers
387 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
106 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
62 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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1answer
69 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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2answers
99 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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2answers
293 views

Do I bond ground and neutral for a feed from a disconnect?

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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1answer
72 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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0answers
325 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 bus. I also installed a 50A power inlet on ...
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1answer
303 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
600 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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1answer
73 views

Wires from meter to disconnect to junction to home [duplicate]

Maybe I am not explaining what I have here There are 3/4 AWG WIRES leaving the meter and Running to a 100A disconnect with a neutral bar no grounding wires in the box just 2 hot and 1 for the neutral ...
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2answers
11k views

Did I use my light fixture's ground wire correctly?

I took down an old ceiling fan in my home, and replaced it with a basic light fixture. When I took the fan down, I saw the normal white and black wires, but no ground coming out off the ceiling. The ...
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1answer
67 views

How to ground solar transfer switch

I am installing an off-grid solar system to power some external buildings, but I want an automatic transfer switch so that outlets will be grid powered when the solar batteries are low. Can I run a ...
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3answers
85 views

Grounded Neutral Voltage Fluctuatons

BACKGROUND: Hi this is in Chicago so we use EMT Conduit as our grounding system and only use an EGC for stoves/dryers/sump pump/ etc... so I was working with my cousin to demo stuff in a basement in a ...
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2answers
84 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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1answer
50 views

Sharing a Ground Conductor Between Multiple Circuits

I'm thinking about running circuits for lights and an infrared heater to a patio. The heater is a 6000 W unit with two individually controlled tubes – I'm thinking this will start off in 12/2/2 NM-B ...
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2answers
60 views

Subpanel breaker sizing in detached shed with electrical feed from breaker in main house panel

I want to feed 240V 30A from a new 30A breaker in my home main electric panel to a new subpanel in a adetached shed. The electric feed I want to use for the new subpanel is (4) 10awg THWN wires (R/B/...
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1answer
52 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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3answers
145 views

How to compliantly bond galvanized water pipes if the water heater isn't an option

In a previous electrical inspection, I was told to add a 4 AWG CU bonding wire from the main panel to the hot and cold pipes on my water heater. I'm in the process of replacing my water heater with a ...
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70 views

How should I handle grounding & neutral bonding when replacing my sub-panel?

Current subpanel was installed in the early 70s. We think we need to replace it as lights are not working (very dim, flickering/fading in/out) - we suspect an open neutral. How do we wire in a new ...
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1answer
371 views

Why would I have i lost one leg on 240 after maintenance guy changed 100 amp disconnect at the meter

I was having trouble with my lights flickering, then the power went out totally. I checked the main breaker inside, and it was not tripped so I went out to the disconnect at the meter and found that ...
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1answer
204 views

How to find a neutral to ground short on my main panel

I've just installed a subpanel in my attached garage. The rough in has passed inspection, however my main panel has standard breakers and has never had fault finding interrupter breakers in it, and ...
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2answers
54k views

Is an explicit ground wire required through steel conduit?

We just bought a Chicago-area house and found that there's no ground wire in some of the recently re-wired areas. I thought that the national electrical code requires a ground wire for new ...
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1answer
80 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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44 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
83 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
1k 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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7answers
65k views

Grounding requirements for main panel and subpanel

I recently had my main service professionally upgraded to 200A and had a 60A subpanel installed in my master suite to support future additions. All work passed city inspection, for whatever that's ...
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2answers
124 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
543 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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3answers
10k views

What can I do about a severed grounding wire?

After doing some yard cleanup, I realized that my panel ground wire was severed. I went to Home Depot and was told that they only carried a temporary solution (see attached photo) and that I should ...
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2answers
156 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
161 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
86 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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3answers
109 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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3answers
3k views

Does intex pool need to be bonded?

Im installing an intex pool 24ft by 52inches. Im reading pools over 42 inches need to be bonded. Also people are saying because of that intex pools need to be bonded. Two things, 1) the original ...
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1answer
147 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 ...