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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423 views

No ground wire, no box (old or new) trying to install light fixture

I just removed an INCREDIBLY old and ugly Hollywood light fixture from my bathroom. The wall now looks like the picture below. I bought a box and a Snap Tite connector. I even got a hold of some ...
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85 views

Can you run earth ground thru conduit into home?

I have a detached garage that I am running coax and cat6 to. Running pvc conduit underground from house to garage. My question is when the conduit comes up out of the ground and into a 1 gang pvc box ...
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537 views

Is a Redundant Ground at Sub-Panel Permitted? Useful?

I've searched the forum and haven't found an answer for this exact situation. Here's the configuration: Main 200A service panel at one end of house (exterior), and 100A sub panel at opposite end of ...
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New Circuit Faceless AFCI tripping with no load

Most AFCI questions here revolve around existing circuits, and AFCI Circuit breakers, but my situation is a little different. Here's the details: Renovation to add a half bath and laundry room in ...
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2k views

Outlet tester results for open ground on mixed circuit

I have a US house built in 1958 that has been remodeled in many stages over the years. I recently tested a circuit that included ungrounded outlets in the old part of the house. A number of years ago, ...
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Can plug an air-conditioner into a outlet with an adapter

So I'm getting a window unit and I've read online that you should never plug an AC into a power strip or even use an extension cord. My room has no three prong(grounded) outlets, can I plug the AC ...
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245 views

Electrical outlet installed by previous owner had Black and Green wires wired together

I've replaced dozens of outlets in my life without incident. This time, when I pulled the outlet away from the box, I found something odd. The white (neutral) wire was as it should be. But, you know ...
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2k 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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2answers
5k 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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370 views

Grounding chandelier in old pan junction box

I recently removed a crossbar from one of my ceiling pan junction boxes and replaced it with a hickey. As I understand it, having the crossbar was a bit odd since a mounting stud was already available....
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115 views

Where should shielded data cables be grounded?

In the comments on this question (Using PEX as wire conduit), the issue of grounding shielded data cables on one end vs both ends came up. For any arrangement of cables (ex. single cable, multiple ...
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65 views

Grounding rods and testing

I'm looking to install a couple of vertical grounding rods for a friend's property in the middle of nowhere (very country - The earth is mostly clay, rocks and sandstone) From the limited research I'...
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Plugging compressor into 240v dryer plug (NEMA 10-30R)

I've recently received a compressor that has a NEMA 6-50P plug on it. I would like to plug it into my current dryer receptacle which is a NEMA 10-30R. Voltage and amperage-wise, I think everything ...
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Distance between grounding rods

Here in Hampshire County, WV we are required to have 2 grounding rods. Question #1 How deep do they need to be? #2 This mountain was formed by a rock glacier before I was born. I can drill down 18",...
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55 views

Installing New panel

I am installing a new service in an outbuilding, It is not at my residence so I can't test it readily. On the neutral/grounding bars in the panel, it appears as if the neutral and ground are all ...
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water heater circuit requires a ground connection

Purchased a British Standard water heater with 3 supply connections -live, neutral and earth. The circuit design requires a ground. Tried to fix the water heater in Philippines which only has 2 pin ...
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102 views

How to check grounding connection

Background: in my neighborhood the water company is renewing the pipe line, taking away the old metal pipes and replacing them with plastic pipes. The electrical network company has thus sent a letter ...
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107 views

Can I use a bonding terminal on ground wire between ufer rod and panel

Long story short, I need to replace an electrical panel. In my the new panel the grounding bar is in a different location than the current panel. The ground wire from the Ufer rod will not reach to ...
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477 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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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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585 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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71 views

What's the purpose of a wire from stud to outside?

On a couple of my studs there is a small gauge wire that seems to go through the outside wall to the outdoors (into the flue cavity) as shown in the picture. What is its purpose? This is on the wall ...
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78 views

What's going on with the electrical wiring (or devices) in this room?

I was soldering components onto a circuit board that was placed on a rubber-like soldering mat on a table. Simultaneously, I was listening to audio from my desktop computer, using wired headphones. ...
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126 views

How can I ground an appliance with a CEE 7/7 plug plugged into a step-up transformer with a “universal” female outlet?

I'd like to use a European appliance (5A 208-240V 50/60Hz 900W) with a step-up transformer such as this one. The appliance has a CEE 7/7 Schuko-French hybrid plug. The transformer has a female ...
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221 views

Wanting to make existing 2-wire 220V outlet a 4-wire one

(Located in the USA) I've inherited a 220V (or 240V?) circuit which is just capped off inside a junction box. It's hooked up to a 30A breaker, and seems fine, except that it's only a 3-wire run--no ...
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470 views

How to splice grounds in a metal box with a 30amp and 20amp circuit

I have a 30amp dryer circuit (4x10 gauge - 2hot, 1neutral, 1gnd) and a 20amp circuit (3x12 - hot, neutral, ground) coming into the same metal box. The 20 amp circuit continues on to another box where ...
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168 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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305 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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NEMA 14 with integral JB — how can I ground it to EMT?

There are two general styles of NEMA 14 receptacle in wide use -- one is the conventionally yoked style that is used with a separate junction box in flush mount applications, but can also be used in a ...
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89 views

Are Ideal Greenie 30-192P Ground Wire Nuts approved for use with stranded wire?

I looked at page 4 of the UL document here: http://www.idealindustries.ca/media/pdfs/products/ideal_ul_listed_combinations.pdf And I notice that it says you can use up to 4 #12 wires. However, it ...
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318 views

Adding ground to replacement sub panel

We recently purchased a new home that has a 16 x 30 steel building in the back yard approximately 100ft from the main panel. The building has power run to it off a 60 amp breaker in the main panel. ...
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545 views

Can I use this copper wire to add a ground to an ungrounded outlet?

I would like to add a ground to an ungrounded outlet so that I can use a surge protector with some electronics. How do you add a separate ground back to panel on 2 wire ungrounded outlet? The copper ...
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3k views

Use 3 prong microwave on 2 wire ungrounded outlet?

I have a dedicated, ungrounded 15A outlet. Can I use a microwave with a 3 prong plug on it if I install an AFCI/GFCI combo outlet? Or do I need to also ground the outlet? The microwave owners manual ...
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7k views

How do you add a separate ground back to panel on 2 wire ungrounded outlet?

This post mentions that it is now legal to add a separate wire to ground an outlet. What is the proper way to do this? Does the wire need to follow the same path as the ungrounded 2 wire path? How ...
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76 views

Need help identifying ground screw

I am installing a chandelier and there is no ground wire in the metal junction box, but there is a screw with a copper wire already running to it. The wire runs up through the box. Is this the ground ...
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3k views

Just bought old house, only some plugs are grounded

please help me! I am a first time home buyer and i just bought an older home. I have been researching the web for an answer about grounding. On my first and second floor i have very few grounded ...
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177 views

Washer/Dryer cases electrically charged

We ordered a brand new washer and dryer. To start the dryer's power cord was wired wrong. It should have been hot-neutral-hot, but instead the installer connected it in hot-hot-neutral. We have it ...
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1k views

Replacing bathroom exhaust fan without ground

I'm replacing a bathroom exhaust fan. The previous fan is probably about 30 years old and was not grounded. In fact, the wiring in the bathroom does not have ground. The fan will be mounted to a steel ...
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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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540 views

I purchased a Lutron occupancy sensor MS-OPS5MH-WH. I have no ground available.

I purchased a Lutron MS-OPS5MH-Wh. It has 2 black wires one green one blue and one bare. I hooked up the two black wires but do not have a ground (green and bare).. When hooked up the light is on ...
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5k views

Is it OK to create a third prong ground from a cold water pipe, for a 2-wire circuit?

When or is it NEC code compliant to upgrade a 2-wire circuit, by adding a third prong equipment ground from a nearby cold water pipe? A different case of borrowing a ground from a nearby circuit is ...
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3k views

Ground Wire (or Wires) after PEX Installation

I recently had my galvanized pipes professionally replaced and now think I have an issue. Previously, The ground wire that ran from my electrical panel used the galvanized pipe as the "conduit" to ...
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1answer
2k views

old home. no ground wire

I'm in the process of making my home a "smart" home. The new outlets are not a problem as they merely plug into existing outlets. The switches, however are something different. They require a ground ...
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341 views

Grounded Conductor Sizing

OCPD: 400A System: 480/277V Ungrounded conductor size: 500kcm How do I find the minimum size Cu THHN grounded conductor? I tried using T250. 102(c)(1) from 2017 NEC 70 and I got 1/0 AWG but I am not ...
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101 views

Could a missing ground connection in a light box disable other fixtures?

I replaced an existing outside light fixture with these security lights. I properly connected the wires together (including ground). After installing I was reading the install instructions a bit ...
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52 views

Ceiling fan grounding

I have a new ceiling fan with a ground wire but no ground fron the metal box. Where can I attach the wire on the fan so it’s grounded?
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133 views

Unwanted grounding from metal screws in metal boxes

In the winter I repeatedly get intense static discharge shocks from the faceplate screws in my basement light switch panels (which are grounded metal boxes, unlike the plastic ones used in non-...
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1k views

Grounding Light Switch

I've been changing out the light switches in my house. None of them have been grounded even though there is a ground wire present. What would be the proper way to ground the new switches to the ...
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764 views

Does the metal receptacle box for 6-30 NEMA need to be grounded?

I have a 240 VAC portable heater with a 6-30 NEMA-style plug. I am finishing the 3rd floor of our house. I installed a sub panel fed with a 50A service using 6 AWG THHN. Installed a 30-amp 2-pole ...
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18k views

Light Switch with no ground

I’m replacing my light switches with Lutron Caseta switches. When I pull the old ones out I noticed they don’t have grounds. The box they are in is plastic. Is it okay to not ha e a ground in the new ...

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