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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1answer
418 views

Does a sub-panel in an outbuilding require a ground wire or rod? [duplicate]

My main elect panel in the house has a common neutral/ground bar and not separate bars. If I run from this panel to a sub panel in a detached pole barn and attach the two hots for 240V and one ...
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2answers
239 views

What is an open ground and why would the neutral wire measure 50v?

What is an open ground? Also, why would there be 50 V in the neutral and ground wires? I have replaced all outlets and switches and still I have no light.
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2answers
54 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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1answer
116 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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1answer
100 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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1answer
299 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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1answer
114 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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1answer
679 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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1answer
4k views

What size grounding wire for a main lug?

I am replacing an undersized 35 amp main lug, so the panel, conductors and breaker in the main panel are all being replaced. The new panel will be 125 amp rated, the new conductors will be #3 THHN, ...
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1answer
511 views

How can I install a ceiling fan with an extension kit that doesn't have a ground wire?

I bought a ceiling fan and it came equipped with the standard three wires sticking out of the motor. The instructions said the ground wire must be wired to the ground wire of the ceiling wire box. But ...
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1answer
1k views

Open ground on all outlets, voltage meter beeping on metal boxes and MC cable

I'm installing a new switch and outlet in a previously renovated garage, and I noticed the following: My Klein non-contact voltage tester beeps continuously on all of the metal boxes and surface-...
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1answer
4k views

How to connect a 3 wire plug to a 2 wire outlet?

Bought a vent fan that came with 3 wires, but homes here are only 2 wires (not sure which but no ground). What to do with the extra neutral wire? Should i cut it or twist it with the other two??
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1answer
110 views

How to connect a detached garage and house electrical panel at the meter?

The meter is in between my house and the garage. Can I connect the service conductors from both panels to the same lugs at the meter? Do I handle both panels grounding and neutral bars as 'mains'? ...
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3answers
4k views

European Light Fixture in the US - Does it require a ground connection to light up

A bit of an oddball question. We bought, through a US distributor, a ceiling light fixture that was made in Europe (Netherlands). It is a metal fixture, connected to the ceiling via a metal chain, ...
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1answer
101 views

grounding wires overkill

I have been replacing some light fixture recently and haven't seen any info on connecting grounds wire together with a wire nut when a)one has been grounded to the green screw on the plate and the ...
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2answers
252 views

How to connect a 230V jointer to a pre 1996 dryer circuit?

I would like to connect a jointer to my dryer receptacle but I am concerned about proper grounding. The jointer draws 8.5 amps at 230V and has a NEMA 6-15 plug. The dryer is plugged into a pre-1996 ...
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1answer
178 views

Replacing light switch with dimmer - can't identify wire colours; no ground

I'm trying to do a straight replacement of a single pole light switch from a regular rocker switch to a dimmer. I pulled the old switch out of the box and found the following: two wires coming out ...
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1answer
452 views

Are ungrounded three-way switches dangerous?

I have 3-Way Switch 1 and 3-Way Switch 2 going to a light / ceiling fan. Older house. I replaced the old switches and the light works when I wire them as below, but I'm worried about the safety: ...
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1answer
181 views

Input voltage drop to 190v after switching over load

We have an Online-UPS connected as per the diagram. The output is given to a change-over switch. So If we want to feed the computers direct AC we switch it to Source O (Top) for bypass and if we ...
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2answers
2k views

Connecting earth wire with motor water pump

I am going to rewire my house and at present we have no earth wire anywhere in our house. Even the wires/cables available here in the market only have one phase wire and one neutral wire in them. So I ...
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2answers
3k views

Is this iron pipe lamp grounded/insulated enough to be safe?

I replicated this lamp from a Home Depot tutorial. http://blog.homedepot.com/diy-industrial-lamp-cool-desk-lamp-made-from-pipe/ I'm worried that the lamp socket isn't isolated enough and that the ...
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3answers
2k views

What problems might a single ground rod above 25 ohms resistance cause?

The Electrical Code (USA) requires that a single ground rod have a maximum resistance to ground of 25 ohms (NEC 250.53(A.2)). If this isn't met, an additional ground rod is required, but no resistance ...
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2answers
133 views

Sub panel grounding

I replaced an old FPE sub panel that has no ground wire with the feed. The main panel is a new 200 amp with a 100 amp breaker feeding the sub. The wire is #2 copper ( 2 hots and one neutral in 1 1/4" ...
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1answer
620 views

New Main Panel & Sub-Panel - Hooking up Ground / Netural - Connecting to Plumbing / Ground Bar

Older 1960's house. The outside panel is a FPE Stab-Lok that needs upgraded. Will be using this panel to upgrade it, which has a 125-amp main breaker: The current box is directly to the left of the ...
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2answers
1k views

I have a 2 prong outlet and a surge protector

so I have just bought all the parts for a new PC, but am weary to build and use it because I noticed I don't have a grounded outlet at all in my room/house. I have been using a computer on this outlet ...
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2answers
137 views

Should light fixture with outlet be grounded to metal box?

I'm replacing an old ceiling light with chain with a light with outlet attachment in a grounded metal box. Do I need to ground the fixture since I have a 3 prong outlet, or since box is grounded I don'...
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1answer
2k views

Why do I get an open ground warning after a GFCI Test?

I just finished a home wiring project which has a set of outlets protected by a GFCI outlet. I was testing them with an outlet tester and noticed something odd: Immediately after a GFCI test, my ...
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1answer
6k views

3 black wires and 3 white wires

I am currently trying to install a light fixture and I'm really confused, I've never seen wiring like this before and I'm not sure what goes where. There are 6 wires in total, 3 black and 3 white. 2 ...
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1answer
40 views

Should I connect the ground in the outlet for the dryer and the panel?

the ground wire for the dryer is not connected at the panel, or at the outlet. Is this correct or do, or do I need to land the ground wire at the panel and land ground wire to the actual dryer plug ...
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1answer
31 views

Grounding switches

If a metal receptacle has 2+ switches but they are all on the same circuit, is it necessary to ground the receptacle to each one (or ground each one to the receptacle) or is it enough to just ground ...
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2answers
3k views

Is it okay to drill a ground rod through pavement?

All the sides of my house are paved, and I need to drive a new ground rod for an antenna. Would it be against code (NEC) to drill a hole in the concrete to pound in a ground rod? Bonus question: How ...
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1answer
622 views

Does HVAC lineset need to be grounded?

My HVAC contractor says the installation of the line set between the air handler and the condenser outside is complete but he has not grounded the lines. Do HVAC copper pipes need to be grounded?
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1answer
104 views

New Fan Switch Grounding Cable issues

I installed a new switch for a new ceiling fan. For power, I pigtailed the 3 wire cable to my new switch from an existing light switch. My problem is with the newly installed ground cable. The 2 ...
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5answers
41k views

Since neutral is connected to ground how is current kept off of ground?

If neutral is connected to ground and current desires ground then I would think it would go to ground. But my understanding is that it is kept off of ground until it's "upstream" of the breaker box, ...
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1answer
217 views

Why do I detect voltage on my ground of surge protector?

Renting an older home and upon moving in was saddened to see outlets without grounds (two prongs). So, for one of the outlets I bought a 2 to 3 prong with ground clip and ran the ground to some vent ...
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3answers
103 views

How to stop current originating from common ground wire?

A building has all the apartments' electric panels connected to a common ground wire. Theoretical situation: 1. one of the building's electric panels has its differential circuit breaker broken 2. it ...
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0answers
57 views

How do i ground a new overhead light fixture? I'm replacing a 2 wire fixture with a new 3 wire fixture wich includes a ground wire

How do I ground a new overhead light fixture? I'm replacing a 2 wire fixture with no grounding wire with a new 3 wire fixture which includes a ground wire.
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1answer
141 views

Oven has 2-prong plug plus earth wire. Socket is modern 3-prong. How to connect?

My 110V toaster oven has a 2-prong cable. Also, the oven's chassis has a screw with a connected green/yellow earth wire, which I want to ground. My wall socket is a modern 3-prong with earth and all. ...
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1answer
68 views

Do lights in a circuit have to be grounded for the whole circuit to be grounded?

I have a circuit in my old house (built 1918), it’s gone through many remodels during its lifespan and multiple owners. This one circuit has no grounded outlets, so I had a look behind the outlet to ...
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0answers
62 views

Electric Shock in Walls and Electrical Equipment

I'm getting a shock when I touch walls, electrical equipment like a water cooler, fridge, etc in my home. I have followed this procedure as I only have a DMM with me. The readings I got after ...
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0answers
69 views

How can I test which mains wire belongs to neutral and which to ground?

I currently live in Spain, in an old building, where apparently electrical codes don't strictly apply... because not all outlets have ground or, indeed, not all connections are grounded. To make ...
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0answers
38 views

I have a ground rod but I have no grounds in the house

My panel is connected to the main water intake jumping the meter and I just installed an 8 foot copper ground rod. Even connecting a new breaker with only one outlet attached to it shows that I have ...
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0answers
36 views

Is it legal to add a ground wire to a dryer circuit? [duplicate]

It would be much easier to put a ground in outside the dryer outlet than doing a homerun to the electrical panel assuming you pull both the existing wiring and the ground to the same surface mount 30A ...
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0answers
61 views

Ground rod driver for very large ground rods?

I have a large Jack/Demolition hammer I use this to pound very large ground rods/stakes into the soil. These rods are those over 1” in diameter. The largest rod driver I can find will fit 1” ...
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31 views

sub panel ground

I have a detached garage with a sub panel. upon inspection I do not see a ground from the main panel and all of the grounds and neutrals in the sub are connected to the same block. I am replacing the ...
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45 views

Not properly grounded/earthed

I know next to nothing about electricity and wanted to ask for some advice. Apologies for any cross-posting. I moved into a rented house in Spain a few months ago. Turned out it wasn't grounded. ...
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1answer
57 views

Are speaker wire output negative posts on receiver common-grounded? [closed]

I am buying a subwoofer (powered Sunfire HRS 12) that has high level inputs (bare speaker wire) and it says that it has it's negative posts joined (common-grounded) and that my receiver or amp also ...
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0answers
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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31 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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67 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 ...