Questions tagged [grounding]

Grounding, also earthing, refers to the practice of providing a direct conductive path to the physical ground for an electric short to a chassis. Tag questions involving the installation or retrofitting of grounding with this.

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91 views

Can outlet circuit ground wires be connected to the panel ground wire?

Introduction My house initially had many outlets grounded to the copper plumbing using ground pipe clamps like this one which I know are no longer allowed via code: I have gone through and replaced ...
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2answers
262 views

Installing nema 14-50 with no ground

Good morning, Im in the US and I have a problem that I can't seem to find a straight answer for. I recently bought a new range and the receptacle was a 3 prong but the oven uses a 4 prong cord. I see ...
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1answer
74 views

Does ground bar block my knockouts?

Can I use the knockouts right next to my ground bar, or does it permanently block them? I'm wondering if I am allowed to run conductors across/over the ground bar and if I can put EMT connectors in ...
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1answer
48 views

How should I go about connecting a switch's ground wire to this apparent grouping of ground wires?

We have an old dimmer switch in a two-switch box (next to a regular light bulb) (in California). The old dimmer switch's button no longer works right, so we wanted to replace it with a new one. We got ...
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2answers
57 views

Do I use all grounding screws in a metal box?

I'm wiring a 4-gang, metal box to hold multiple switches. It has 4 grounding screws. Do I need to pigtail around each of the box's grounding screws? My plan is to splice all the grounds together with ...
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62 views

Electrical voltage is between box and wire, not between hot and neutral. Not OK?

I live in a house that has significant issues. Here's the current one I'm wondering about. This electrical outlet box seems to be "live". There is 120v voltage running between one of the ...
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1answer
34 views

What do I do with two prong plugs in my house, when my fuse box is grounded?

To whom it may concern, I just bought a house that was built in 1958. When the house inspector went through the house, he noted that our main fuse box was grounded at the breaker, and then randomly ...
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43 views

Ground/outlet tester shows bad ground for entire house after switching single outlet

I just changed out a receptacle. Prior to changing I tested the original receptacle with a ground & outlet tester. It showed everything to be wired correctly (green light). After installing the ...
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1answer
92 views

grounding outlets and old wiring

Background: I recently moved into a house in the western US built in the late 1950's. Most of the receptacles are two prong and don't have any ground wire running to them. I would like to have three-...
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0answers
43 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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0answers
36 views

Faults/current leak in an ungrounded electric setup (connected to a grounded setup)

I'm troubleshooting the wiring from our neighbor's house. His electric setup is ungrounded. Our house, pending an "official" installation, gets its electricity via a ~30M cable (3x1.5mm2) ...
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2answers
58 views

how do i troubleshoot a substantial AC volatge neutral to ground?

I've been having some problems with my computers at home. Today I decided to check voltage from the receptacles. I have 120VAC hot to Neutral, as I would expect, but then I have 50VAC Hot to GND, and ...
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4answers
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What happens if ground and neutral are swapped in a light switch?

I’m replacing a light switch in an old house with lots of uncolored wiring. I removed the switch plate to find two black wires (connected to the switch) and a capped up white wire (see photo below). ...
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1answer
75 views

Which is the ground wire in my lighting circuit?

I am installing track lighting and have uninstalled the old florescent lighting. I am now left with: 1 white wire 2 black 1 yellow And what looks to be an exposed copper wire. I understand that the ...
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2answers
54 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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3answers
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Dual Grounding Electrodes In Parallel versus series [closed]

I've installed two 8' copper rods each with a beefy copper wire tying them back to the panel ground. It is the entrance panel, so neutral is also on that ground and the service pole is ~15' away with ...
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3answers
63 views

Existing outlet, metal junction boxes, new circuits, and ground

I have an existing 15a outlet in the wall of my garage (in-wall nm 14/2). I want that outlet to serve another area, so I've added junction box on top of the outlet and used EMT to run another ...
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1answer
48 views

Sizing Ground wire for 200AFeeder to House

Im moving my service entrance from my house to a shop 75' away (in Tucson AZ, with TEP). The new service will be 400A (well 320/400) with the shop eating 200A and a backfeed to the house underground ...
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1answer
320 views

Ground wires absent from circuits exiting apartment panel

I'm taking a look at the (only) panel in my apartment (7 apartments in building, NYC) and I'm noticing that out of all the circuits leaving the panel, not a single one of them contains a ground wire. ...
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2answers
288 views

Why were the ground wires in my light boxes either cut off or tucked away unused?

I live in a home built in 2006 in Delaware. There are a mixture of plastic and metal boxes for light fixtures throughout the house. I am in the process of replacing builder grade lights with better ...
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1answer
79 views

Is my touch lamp safe?

The touch lamps body reads 12 volts and it vibrates when I touch it. Is the lamp safe?
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2answers
61 views

2 prong to 3 prong outlet - with pigtailed grounds

I've seen a bunch of these questions and I just want to be absolutely positive that I'm doing the correct thing here. I have about 2-4 wall outlets per bedroom - all of them on 15amp breaker(s). I ...
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3answers
129 views

Why did my generator trip the feed breaker in the subpanel?

I connected a Predator 9000 generator to an Intermatic pool subpanel through a 2 pole 30 amp breaker to backfeed the main panel through another 2 pole 30 amp breaker. There is a GFCI receptacle on the ...
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1answer
1k views

What do I do with the ground wire in a smoke detector install?

The electrician ran 14/3 to a metal box. There is no grounding post on the Kiddie i12010s smoke detector. Can I just cap the ground and call it done? Doesn’t seem right but I’m not sure how to ...
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1answer
73 views

Is there a good way to add a rebar-type concrete encased grounding electrode AFTER the slab is in?

My workshop project has a 1200 sqft slab with 40 cu-yards of concrete! and 900 lbs of rebar in it. Unfortunately, I didn't set up to put in a proper concrete encased grounding connection... is there ...
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1answer
52 views

How to ground an amplifier without ground pins on outlet?

My electric guitar amplifier's plug has got ground pins but my wall outlet does not have any ground pin and I want to use this amplifier grounded. How could I ground this properly and safely If there ...
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2answers
183 views

Metal box grounding question GFCI outlet

What is this wire for? The picture shows a wire connected to the grounding screw and back to the outlet. Is this commonly done to get a connection to the metal box? My outlet tester shows this outlet ...
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1answer
113 views

Replacing older Leviton dimmer with new Lutron different wiring

I'm trying to replace some older (late-1980s?) Leviton incandescent-only dimmers with new Lutron LED-compatible ones. There are three of them in a 4-gang box (the 4th switch seen in the pics is on a ...
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2answers
81 views

Gasoline Storage [closed]

I have gasoline stored in a metal drum. The Drum is up on wooden horses. The drum is grounded with a heavy wire and connected to a copper rod into the ground. I assume a lightning strike nearby could ...
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0answers
83 views

Identifying cause of floating ground

I noticed that the ground prong of the only 5-15 receptacle in my laundry room appears to be floating. Findings: The ground wire behind the receptacle measures 0 ohm (i.e. continuous) with the ...
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2answers
77 views

How to Connect to Ground Wire Passing Through Electrical Box

I am changing light fixtures and noticed that the end of the ground wire is not accessible from inside the electrical box. The ground wire simply passes through the box. I've gently tugged on the ...
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2answers
8k views

Why is my garage grounded ONLY when it rains?

My garage is not connected to my house and it's on a circuit that contains a few outlets inside the house as well. I found out the first time I tried to charge my PHEV that the entire circuit isn't ...
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1answer
120 views

Found neutral and ground feed twisted together in a junction box. Safe to fix?

I recently found that the neutral bar and ground bar in my home's subpanel have no resistance (0 ohm) between them (when the neutral feed to the subpanel is disconnected). I root caused the symptom to ...
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2answers
490 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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1answer
68 views

Safely possible? Back feed generator through existing 3 wire OR convert to 50A RV service

First time question asker, here. I have read several threads on this site, which is a great resource. I am still unsure if what I'd like to do is safely possible, so here I am asking about my specific ...
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3answers
100 views

What are the risks of improvising to use a nearby embedded metal as a local electrical ground?

I'm in India where domestic supply is 250V 50cps 1ph. My question is similar to Why does my new floodlight trip the circuit breaker?? In my case the supply does not have a ground to this particular ...
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2answers
2k views

Can I use green wire in a residential wall box?

This is a 1985 home wired with typical NM-B wire and plastic wall boxes. I have a few light switches around the house that have no ground connection. There are ground wires in the box, but the ...
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3answers
2k views

How to differentiate neutral or ground bar?

This is the main panel, the green neutral bonding screw is there. How to differentiate the neutral and ground bars? In this case, does it matter which one I use as ground or neutral for the interlock ...
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2answers
260 views

Is my switch grounded at all?

This morning, whenever I tried to turn on my bathroom light, it would flicker, then die. From what I understand, the most likely culprit here is a loose connection somewhere. When I took my switch out ...
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2answers
64 views

Ground wire light switch to outlet

I am trying to install a Leviton IPS02-1LW (Amazon link) motion sensing light switch. However, my current light switch does not have a ground. Can I run a ground wire from a nearby outlet, or could ...
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1answer
189 views

isolated grounds in branch circuits? How does this work with conduit?

I recently was told that grounds from different branch circuits in a box need to be isolated. I'd really like to understand the purpose of this. It doesn't really seem like it would contribute to ...
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1answer
56 views

Grounding question

I'm replacing track lighting with slim recessed led lights. Metal electric box has black wire, white and there is a twisted copper wire that is not secured to anything. Pretty sure thatis my ground ...
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1answer
546 views

Is it required to electrically ground rebar in an exterior concrete slab?

I'm looking for information / references on when exactly it is required to ground / bond the steel reinforcement in an exterior concrete pad, and how to do so. The pad I'm planning is for a hot tub / ...
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2answers
162 views

Double Grounding Sub-Panel

Non-electrician here - I have a small detached garage 25ish feet from the main service on the back of my house. In consulting with an electrician he said the simplest way to get power out would be ...
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0answers
34 views

1963 home New Zealand electrical wiring question

I have a house that was built in 1963. I was sure the wiring was upgraded at one point. I went to install a new switch in my daughter's room and found exposed twisted copper running to the earth ...
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2answers
198 views

Are two 8' grounding rods and clamps on the gas and water service necessary for 25 ohms?

I was just told by the electrical inspector that I need grounding clamps on the cold water and gas line in addition to two 8' grounding rods. As far as I'm aware the NEC only says you need to have a ...
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4answers
64 views

Grounding a ceiling fan with FMT conduit present

I am replacing a recessed can light with a new ceiling fan/light. The old housing is a 6" HALO 7HT like this: Inside the metal box there are 2 bare copper ground wires connected. Inside the ...
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3answers
273 views

Should I use SER or URD cable for a 100 amp sub-panel?

I am running a new line from my main panel on the pole out to a sub panel in my shop. The sub panel will be 100amp. I have a 180' run and have buried 1-1/2" sch40 conduit. I'm planning on using 1/...
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2answers
52 views

4awg Al on ground bar with 6awg max holes

Im adding a subpanel, I installed a tgl2 (GE) ground bar that take 6awg max, my ser is a 2-2-2-4. Is there a way I can use this ground bar with a 4awg Al ? Also do I need to use some type of grease on ...
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1answer
3k views

How to ground a switch without a ground screw?

I'm rewiring my house, and keeping some circa 1920 light switches, which don't have ground screws. The switch cases are porcelain, and have a brass yoke. I originally planned to sandwich a ground ...

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