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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2answers
8k views

How do I add grounding to my old electrical wiring?

This old house is (50's) is wired with cloth covered 12/2 Romex with no ground and all metal boxes. Can I just run a 12 ga or 14 ga solid wire between boxes and then to the ground bus of my service ...
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1answer
699 views

What is this orange clip my ground wire is connected to?

I am trying to replace a dome light with a nice small ceiling fan. When disassembling the old light, I notice an odd orange/clear clip connecting the lights ground to the house. What is this called, ...
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3answers
12k views

Can a grounding issue with newly installed light fixtures cause a short circuit/blown fuse?

I have installed three lights (60 Watt Bulbs) on the same line (wire) connected to one light switch. The fuse blew when I hit the switch. I’ve connected all of the white to white and black to black....
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2answers
267 views

Move grounds to subpanel when I moved 8 single pole breakers to same subpanel?

When I move 8 breakers from main panel to a subpanel (a few feet away) can I simply move the hot and neutral only to subpanel? The 8 breakers are grounded in the main panel already. A 100 amp breaker ...
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3answers
357 views

How do I ground a new outlet that only has the black/white wires?

I am adding a new outlet but want to make sure it is correctly grounded. I have outlet A that I am going to be creating a new outlet B. I tested A and it says it is grounded and want to ground ...
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2answers
23k views

Why doesn't my motion sensor light work?

I want to install a simple motion sensor (Lutron Maestro MS-OPS2) on a single pole switch in my garage. When I installed it the light would not turn off. The instructions (PDF) that come with the ...
3
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2answers
587 views

How can I connect a new ground rod?

Illinois house, built 1963. Not sure if there is a ground rod or just the water pipes used for ground. Want to put in another/first rod. Can I connect it to the clamp on the electrical meter housing ...
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2answers
107 views

120V measured between different outlet grounds

I'm experiencing some electrical issues with the apartment I'm subletting. While connecting up a projector/speaker setup using outlets from different sides of the room, we discovered (through means of ...
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3answers
8k views

Can I splice grounding wires together to reach an old outlet that needs a ground?

I have a two prong outlet in my house and there is a ground wire behind it, not connected. The ground wire ends in a junction box halfway to the breaker box. Only the neutral and hot wire continue ...
3
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2answers
12k views

Is there a reason not to connect the ground wire to a chandelier?

So, I am replacing the insides of a chandelier, but now I dont understand why the person who installed it would leave the ground wire hanging without being connected. I can see a ground wire taped ...
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1answer
2k views

How do I ground a TV antenna on my shed with the cable running underground to my house?

I want to mount a TV antenna on my shed in my back yard and run the wire underground to my house. The shed is about 60 to 70 feet from the house. There is electrical service in the shed, but there is ...
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3answers
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
2k 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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2answers
450 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
3k 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
616 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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6answers
41k 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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1answer
814 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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2answers
3k views

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
110 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 ...
3
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2answers
599 views

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
661 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
741 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 ...
3
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1answer
268 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
329 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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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
177 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
3k 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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3answers
1k 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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1answer
1k 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
285 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
1k 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 ...
2
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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 ...
2
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1answer
203 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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3answers
450 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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2answers
903 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 ...
2
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1answer
622 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
13k 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
3k 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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2answers
1k 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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3answers
3k 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
13k 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 ...
2
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1answer
73 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
929 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
136 views

Is it proper and/or smart to independently ground an older 3 prong dryer outlet and upgrade it to 4 prong? [duplicate]

Just bought an older home that has a 3 prong dryer outlet. It is right above an unfinished crawl space so it would be easy to run a good grounding cable to a grounding rod and/or an iron water pipe ...
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2answers
5k views

Is it safe to substitute a 10-gauge wire for ground strap on dryer?

I am backfitting a dryer with a 3-prong plug. The manual says to connect the body to the neutral terminal using a copper ground strap. I don't have a ground strap and none of the stores around carry ...
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2answers
204 views

What did cable installer use to tap onto my service ground?

I have a somewhat mysterious service ground apparently underneath a concrete entryway. All that is visible now is a heavy gauge bare copper wire coming through the cement. When the cable company ...
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2answers
7k views

Converting a Samsung Dryer from a 4-prong cord to a 3-prong cord?

I just bought my first home and I need to replace my 4-prong cord on my dryer to a 3-prong. I've removed the four prong and now I see this: I know how to hook up the three prong, I'm just unsure ...