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
497 views

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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52 views

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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2answers
53 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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30 views

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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3answers
82 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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2answers
71 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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2answers
170 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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0answers
32 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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3answers
280 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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0answers
59 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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77 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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1answer
85 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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83 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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1answer
353 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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2answers
118 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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1answer
187 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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35 views

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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2answers
74 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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1answer
282 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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1answer
290 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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1answer
2k 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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3answers
3k 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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1answer
64 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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1answer
1k 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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1answer
83 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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2answers
407 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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2answers
830 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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0answers
453 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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1answer
4k 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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1answer
2k 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
1k 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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1answer
226 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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0answers
97 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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1answer
44 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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2answers
97 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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1answer
388 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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2answers
478 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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2answers
10k 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 ...
4
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1answer
3k views

Replace light switch with no ground wire in box

I just bought a GE Z-Wave dimmer and the I went to install it I noticed that the previous switch did not have a ground wire attached to it. The new switch says that it requires a ground switch (and ...
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4answers
918 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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1answer
122 views

Mysterious 40v multimeter reading on AC appliance chassis (US 120v)

I'm an electronics guy but my specialty is DC stuff, I know very little about AC wiring, so forgive my naivete... I have an old 16mm slide projector I found in my grandparents house. The original AC ...
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5answers
5k views

Is it possible to self install a grounding rod?

This has been a baffling question as I notice electrician charge an arm and a leg to upgrade electrical systems in a home. My home was built in the 1930s and it’s not grounded. I was wondering if a ...
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2answers
445 views

Can I ground junction box directly to panel?

I have a metal junction box but I'm currently using as a pass-thru for the wires running through it. It's the incoming box from outdoor underground conduit burial. My ground wire is just barely long ...
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1answer
104 views

Why is there a current in my house panel grounding strip

When I measure current in the grounding strip coming from my house electric panel to the water pipe using clamp meter I am getting slowly fluctuating value from 1.5 A all the way to 4 A. In my ...
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2answers
553 views

Long outside wire run - can I JUST ground at both ends?

I'm planning to run 300 ft of direct burial, 12 gauge, 3-conductors, no ground cable. Buried underground. The cable will carry 240v split phase. The main panel at the start of the run is already ...
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2answers
458 views

What do I need to provide the cable company with for grounding, when wiring my own house?

I'm planing to do my own electrical wiring for a new house, and the cable company needs something to attach their ground wire to when they mount the demarcation box. I'd like a clean looking install, ...
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1answer
2k views

Why is it OK to bond the neutral and ground in an appliance?

I am installing a new built-in oven, and while it has both neutral and ground pigtails, the manual states that they are "twisted together." I am interpreting this as "electrically connected." Given ...
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1answer
180 views

Using the existing neutral as a PE grounding conductor on a NEMA 10-30 outlet

I was redirected here from the electric engineering exchange with a more specific question out of this earlier post: https://electronics.stackexchange.com/questions/340136/is-it-possible-to-run-an-...
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1answer
618 views

Is it possible to run an Antminer S9 on a 250v NEMA 10-30?

I am in the process of starting a crypto mining farm. Eventually I will be getting upgraded outlets, but for now I am working with NEMA 10-30 dryer outlets that were installed back in the early 90s. ...
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3answers
6k views

Is it code to nut off a ground wire instead of connecting it? [duplicate]

I was replacing a standard light switch and noticed that the current light switch’s ground wire (green) was not being connected to anything. It was connected to the switch on one end and to a wirenut ...