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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6k views

Can I attach the main ground from my service panel to the old steel water main in my house?

My current main ground is improperly connected to the water line in my house and I am planning on changing it this week. It is "connected" to (read: formerly soldered, now kind-of-sort-of laying on) a ...
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1answer
98 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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1answer
76 views

Why does light switch not use ground wires inside of box?

I was replacing some toggle type light switches to rocker type and ran into something I thought was unusual. There were 3 switches boxes (2 boxes had 1 switch, and the other had 2 switches) I was ...
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1answer
129 views

How does metal bracket provide ground?

I am replacing an old light fixture. The junction box has no ground wire coming out of it. The instructions say that if this is the case to attach the ground wire from the light fixture to the green ...
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1answer
5k views

What is the difference between a coaxial grounding block, an antenna discharge unit, and lightning arrestor

I've been reading about grounding outdoor TV antennas but these terms seem to be used interchangeably by various articles on the internet. For example, this article seems to make a distinction ...
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1answer
371 views

How do i properly use conduit across roof shingles?

I am grounding an antenna and I have two 10 gauge copper wires from the antenna and coax ground block to the ground rod and I am going to put the wires in some 3/8" flexible conduit. Is there a proper ...
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2answers
563 views

How does a water meter affect the continuity of a grounding electrode system when a jumper is present?

250.53(D)(1) Continuity. Continuity of the grounding path or the bonding connection to interior piping shall not rely on water meters or filtering devices and similar equipment. 250.68(C) ...
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1answer
4k views

How to wire ground when the sub-panel is Plug-On Neutral

I need to install a sub-panel in my home. Both the main panel and the sub panel are in the same building. I purchased a Square D Homeline Indoor Plug-On Neutral panel (Model # HOM2040M100PCVP) for ...
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2answers
731 views

How to track down a short circuit in attic with pressed metal ceiling?

When switching on a light the circuit breaker tripped. On the distribution board, I switched off the sub-circuit for the light. The rest of the house and the plugs in the room with the light still ...
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1answer
942 views

Is there a safe alternative to electrical grounding for computers in Argentina?

I came across this APC product page for Microsol Isolator Modules, which purportedly provide "safe power in places with poor or nonexistent grounding." The unit is meant for Brazil, so it won't work ...
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subpanel ground requirement - attached vs unattached structure - what difference does it make?

Subpanel in the garage is currently fed by 10-2 w/ground romex and is grounded both at the main panel via the ground wire and to the plumbing next to the subpanel (underground iron pipe). I want to ...
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1answer
144 views

adding new circuit to generator subpanel without a ground bar

I have a main Square D panel with a post-installed Generac (Siemens) subpanel with automatic transfer switch to standby generator. I want to add a new 15A circuit to the subpanel so I can move a ...
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1answer
1k views

What should happen with plumbing ground connections when converting to Pex?

My house is being re-piped by replacing all of the copper with PEX starting at the water service entrance. I'm on a well which is 150' from the house and the service line is CPVC. Currently, there is ...
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2answers
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Is this ground attached to the wrong water pipe? [duplicate]

I recently noticed that I have ground wires attached to metal water pipes in my home, as shown in the following image. The area marked A is where the water service enters the home with that blue ...
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2answers
1k views

Ground new wiring going into old two-wire outlet?

I'm wiring in a light switch and light into a closet on the other side of the wall of this outlet. I've run romex from the lightswitch hole through the wall and into the back of this metal box (...
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1answer
1k views

Should a stove flue be grounded for lightning protection?

I have a freestanding wood burning stove that has a metal flue straight up through to the roof. The existing stone chimney with aerials is taller than the new flue (see pic). Should there be an ...
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1answer
303 views

Grounding subpanels located ~100ft from main breaker

Based on this question on EGCs in conduit (in the context of branch circuits) and this question on conduit as a sole ground source, I would like to know whether two subpanels, located ~100ft from the ...
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1answer
471 views

Can I use a busbar as a ground in my travel trailer?

I need to ground my inverter and a few other items from my fuse box. Can I use a single busbar, mounted to the floor, as a ground. If not, can you offer suggestions?
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1answer
2k views

Where do I attach the fixture grounding wire when no supply grounding wire is provided?

I am replacing an undercounter light and I have a black, white and red supply wire but no green or bare copper supply wire. Where do I attach the green ground wire attached to the fixture?
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66 views

How do I manage grounding when installing a metal extension on a plastic box?

I've been repairing an outlet that's not supposed to be recessed, but is, so I purchased a box extension from the local hardware store. When I tried to put it in, I realized it interferes with the ...
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0answers
33 views

Grounding requirement for 24vdc off grid lighting system [closed]

We are a sign company and our client wants his new illuminated (LED) ground sign to be powered by solar with battery storage. We have it all spec'd out but I want to make sure I'm following code but ...
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2answers
210 views

If i use one ground wire for two outlets, will my equipment get damaged?

If i use one ground wire for two outlets, will my equipment get damaged? Here is what I want to do: If my air conditioner sends voltage through the ground wire shared with the outlet powering my ...
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5answers
7k views

Why are ground wires required to be so large if a short results in an immediate breaker trip?

The purpose of ground wire is just to carry current in milliseconds enough to trip the circuit breaker, it won't even get hot. So what is wrong with using very small ground wire? For example. You are ...
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3answers
1k views

Installing Pendant light with gold, silver and bronze coated wiring

I bought some used pendant lights that 3 plastic coated wiring in silver, bronze, and either gold or green. All the wires are silver. I'm assuming the wiring is done that way because the wires are ...
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264 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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3answers
2k views

Tester showing ground, but I am not seeing a ground

In the original portion of my 1940's house, I have three outlets that have wires being ran using conduit. When I test them using a three prong tester, it shows that they are grounded, but when I open ...
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3answers
694 views

Is is safe to only use a gfci with no ground wires downstream?

If you use a GFCI outlet and the rest of the outlets downstream don't have a ground wire attached, are they still considered grounded and are they safe?
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1answer
2k views

How can I make a fake ground output?

I'm having problems with my electrical oven: I get shocked when I touch it. I think the way to solve this is to connect the ground wire it has (the green wire) to ground? The problem with that is ...
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2answers
168 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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2answers
258 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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2answers
320 views

Would using a grounded extension cord negate the effects of a ground prong missing from device?

Specifically: I have a PA System with the ground wire missing. It has shocked me in the past and I'd like to use it. Short of a repair (which is coming), would using a grounded extension cord from ...
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4answers
3k views

If my heat pump does not have a neutral, do I still need a neutral wire?

I had a friend wire 10-3 line for a new heat pump. He connected the red and black conductor wires in the house to the 2-pole 60 amp breaker and the neutral white to the neutral bus bar. The outdoor ...
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4answers
2k views

Testing my 2-wire home receptacles with a Southwire model 50020S-A

I'm about to put my 1885 Victorian on the market. When I moved in, every receptacle except those in the newly-remodeled kitchen was a "2-prong." There are otherwise no ground wires or armored cable in ...
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2answers
2k views

NEC code regarding grounding and conductor pass through

I am adding a mini split system to my house which currently has a smaller air-conditioning condenser in place. In brief, the house is very old so we opted for a ductless mini-split over trying to ...
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1answer
253 views

Are receptacles protected when downstream from ungrounded GFCI?

I have an ungrounded circuit in my house with three-wire grounded receptacles. If I install a GFCI, will the downstream receptacles be protected even if the GFCI is ungrounded?
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114 views

Does an existing unprotected conductor need to be immediately rewired?

While cleaning up under the sink, I noticed that an existing owner wired the disposal outlet as shown: It has a red conductor traveling into the crawlspace without a plastic or metallic sheath. I ...
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2answers
2k views

In 2/3/4 gang box, should you combine all grounds using crimp connectors?

When I have multiple lines going in/out of a 1 gang box (with an outlet/receptacle or switch), I typically combine all the grounds into a single wire using crimp connectors: However, when working ...
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2answers
2k views

Is it bad to have multiple grounding electrodes?

I think this question gets close to answering my question, but I am not quite sure. I have a detached structure, powered by a feeder from the main panel where the ground and neutral are bonded. The ...
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1answer
1k views

Moving into ancient apartment, two-prong outlets

I just signed a lease on an apartment. I didn't look carefully at all the outlets, but I noticed that each bedroom has exactly one outlet, and the overhead light fixture in the kitchen works by ...
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3answers
16k views

Is it legal to wire a bath fan using load from top of GFI outlet?

Purchased a place and we are re-wiring the bathroom and putting in a standing shower. The bathroom is quite small so there is just enough room for this. There is a dedicated circuit, a round box above ...
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2answers
98 views

Mystery circuit breaker causing odd behavior in other circuits such as polarity switching and power on ground

There is one romex that runs from my box to the upstairs. This romex has 4 wires, black, red, white and green. The black wire goes to breaker 30, the red wire to breaker 32, the white wire to the ...
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2answers
84 views

220ft Feeder Run to Storage Shed

The Objective: Run a combo Heat/Cool Window unit, 1 switched light and some outlets to a detached storage shed 140 ft from home. Temperature goal is 60F min in winter and 80F max in summer. Located in ...
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2answers
6k views

What is the purpose of this grounding screw in a plastic electrical box?

Upon inspecting my light bulb socket in the garage of my new construction home (2018), I found a random grounding screw which wasn't wired to anything but attached to some bar. Does anyone know what ...
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3answers
5k views

Using receptacle mounting screws for ground connection

I will soon be adding some outdoor wiring using weatherproof metal boxes and EMT conduit. I noticed when I was playing around with a multimeter that without a ground conductor between a receptacle and ...
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1answer
18k views

Main service electric panel has no neutral wire - both neutral and ground wires on same bar - sub panel question

My main service panel is 200 amps and has only 2 black wires coming in, there is no neutral wire like I was told is commonly how it should be. All neutral and ground wires for the individual circuits ...
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3answers
46k views

Does an extension cord from 2 to 3 prongs have any benefits?

If you're plugging a device with a 2-prong plug into an extension cord that has 3 prongs on the other end, does that give it the grounding benefit of the third prong?
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2answers
61 views

Extending ground from one circuit to another

One of my circuits has a compromised ground wire, by something along the route of its cable ( like a nail or something ) so it's not grounding properly. If it has only one receptacle ( dishwasher + ...
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1answer
86 views

Is there a Grounding Electrode that can be buried less than 18"?

A house that is being constructed is being built on ground that is only 18" deep before it hits bedrock. The rebar can't be used as the grounding electrode because there is a vapor barrier below the ...
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1answer
2k views

Can I run a new ground wire from junction box in attic down the wall to replace 2 prong outlet

I have an older home where some of the house has updated electrical and some doesn't. In a few rooms I still have several of the 2 prong outlets with no ground wire in the box and I want to replace ...
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2answers
3k views

Grounding sheds and garages

I have a detached garage whose wiring is fed by just two conductors running back to the main panel. There's no ground wire in the feeder and no separate ground rod at the garage. The feeder has only ...

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