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
90 views

Safest way of temporarily working with a failed 4-wire outbuilding subpanel (one missing hot leg, neutral bonded ground on both ends)?

This is actually a multi-pronged question. I will ask it all and split out what I can as needed. I am renting a remote out building in a rather rustic location on a farm. The power situation here was ...
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314 views

Can I ground a new light to an old metal box via a switch yoke?

All of my switches are installed in old metal boxes with no threaded ground screw holes. The boxes are wired using old cloth BX with no ground wire(grounded via casing). Some of the BX wire ...
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1answer
3k 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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79 views

Grounding of a Metal Roof Vent

My kitchen range hood is vented through the roof. The vent pipe on the roof is made of metal and extends a bit higher than the roof ridge. It is connected via metal ducts to the range hood. The range ...
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4answers
1k views

Main Breaker Gets tripped every 1-2 hours but last longer in the night

Our home is located in India. We have an individual circuit breakers for all the 7 rooms in our home. And wrapping them whole is the main breaker. Earlier there used to be short circuit in certain ...
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1answer
943 views

Use 60Amp disconnect as a pass-through to another disconnect

We would like to add a second air-conditioning unit. The original 60 Amp disconnect is grounded via EMT to the panel. The existing EMT will meet code requirements for both conduit fill and derating ...
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2answers
1k 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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2answers
557 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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2answers
16k views

Is it ok to use a ground rod at a subpanel instead of a fourth wire?

I understand running the neutral wire back to the main service panel and not bonding the subpanel... but running the equipment ground back to the main panel seems to get conflicting answers. If ...
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2answers
114 views

Is it personal preference or code to connect grounding wires and neutrals to separate buses?

In my main panel all neutral wires are connected to one bar and all ground wires are connected to another bar. is this just a personal preference or the proper way to do the job.
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2answers
516 views

Will this particular breaker box allow ground wire to connect at neutral?

House is ran with EMT.. I have two dedicated circuits coming in from outside the house for a swimming pool, with a dedicated ground to the main breaker box. I want to connect to far right bottom ...
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1answer
332 views

Should I install a grounding rod near my light post to protect against lightning?

We have a very old house, which has had an old run of electrical cable (2-wire) from the basement about 40ft to a lamp post that has been unused. The old cable has been disconnected, and the current ...
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1answer
690 views

Is there any way to do an Ufer (concrete-encased) ground with a monolithic slab that has a vapor barrier?

If I understand correctly, when using a monolithic slab (where the footers and slab are poured as one piece), the vapor barrier is installed under the slab and the footers. The NEC does not consider ...
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1answer
402 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
79 views

How to track down a ground failure

Several times, I felt some tingling when using my 30 year old grounded sawzall. Brand is Milwaukee. I thought that was odd since it has a grounded cord, plus I was wearing hiking shoes with thick ...
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3answers
3k views

Outlet tester shows “bad ground”

I have a brand new Square D sub-panel installed in my barn that replaced an old panel that had been there for many years and was deemed a fire hazard by the inspector. The new panel has a grounding ...
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0answers
146 views

Why showing bad ground on my detached garage?

Everything has to be conduit by code. When i use my stop shock tester everything in the house shows no problems which is two wired. However, when those wires run from the panel box to the detached ...
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2answers
2k views

Grounding metal building power panel

I have a question about grounding. The scenario is my shop has a concrete floor with metal framing and siding. The panel is mounted to the wall via struts. A #2 Al ground wire is ran from the meter to ...
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2answers
961 views

Grounding fault - stray voltage on bath faucet

2 months ago I moved into a house from 1959 (1 220V phase and 1 neutral coming in). I noticed on the 2nd floor bathroom that there was stray voltage on the faucet (-+ 30V). No socket outlets in the ...
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1answer
1k views

GFCI tester doesn't trip GFCI. Bootleg ground?

My girlfriend recently moved into a new apartment which I have come to suspect might have bootleg grounds, or otherwise improperly wired outlets. After multiple surge-protectors said that they were ...
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2answers
132 views

make ground 4 gauge wire from several twisted 12 gauge solid copper wires

Can I make a 10 foot long single 4 gauge grounding wire from several twisted 12 gauge solid copper wires?
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1answer
943 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
528 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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2answers
196 views

Practical advice needed on house with no earth/ground

I've just bought a 4th floor apartment in an old (1820) building in Spain. Neither my apartment, nor the building as a whole, has any earth circuit. I'm looking for practical, technical advice on ...
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3answers
216 views

How dangerous is it to leave a 35KVA diesel generator ungrounded?

How dangerous is it to leave 35KVA diesel generator ungrounded? This generator is connected to temporary metal buildings for workers, AC and other electrical devices.
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1answer
277 views

Does the NEC permit brazing for connections to ground electrodes?

I need to connect several copper-clad ground rods together with AWG 6 solid copper wire for lightning protection, and as part of the electrical service grounding. I also need to connect some 2.5" ...
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2answers
414 views

Is the ground wire connection grounding all switches in this box?

I am installing a Z-wave switch (I have done others), but this one is different. There are three switches in this junction box. However, only one switch is grounded (not one I am installing), and ...
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2answers
374 views

3 hots, 3 neutrals, 3 grounds; so confused

We have a 78' rancher here in Texas we just moved into and just replaced all the power receptacles/ outlets. So of them were tricky some of them were straight forward, the room was split up into two ...
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1answer
595 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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2answers
218 views

Ungrounded Desktop PC; Workaround to Remove Static Charge?

Background I'm in China (hot, dry area) for the summer and am a guest in an old (1980s**) single family home. Because I am working all summer, I brought my desktop HP computer with me. After ...
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3answers
332 views

Ungrounded GFCI Outlet with 3 pronged connection

I have a GFCI outlet on top of my pergola outside that had solid 3-conductor wire ran from there to an outlet on the other side of my patio when my parents built the house. My Mom wants me to put ...
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2answers
194 views

What is the functional difference between using a ground wire, and grounding to a fixture?

Is one method better than the other? How so? In the possible event that one has both options at their disposal, which one should they choose? An example where you would have both options at your ...
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2answers
520 views

Grounding a Ballast for wood enclosure when there is no metal?

I have a big 6'x4'x3' enclosure (glass and wood) for my Tegu monitor. The external magnetic ballast for my fluorescent light broke and I would like to replace it with an electronic ballast. The ...
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2answers
269 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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3answers
207 views

Why is there a live and a neutral in a wall connector?

I get the ground. Since you can plug the plug in either way there is no way for the appliance to know what's in what wire, right?
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3answers
999 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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1answer
395 views

Can ground wire be downsized mid run?

I'm planning on running some schedule 80 PVC conduit in my garage to add extra outlets. At the same time I want to ground the 2 post rack I have in my garage. A few related questions that appear ...
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4answers
113 views

Equipment ground

I am helping family with finishing and upgrading the service to a separate garage 30ft from the house. Currently, there is 12-2 NM w/ground on a 20 amp breaker cord-capped and plugged in to a ...
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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
93 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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1answer
2k views

Ground wire with 1/2 EMT Conduit

Do I need to run a ground wire with conduit? I have installed a line of lights using 1/2 EMT and tied into another circuit that is grounded coming off the panel. There are about 7 lights in a ...
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2answers
2k views

adding a ground wire to a 2-wire breaker panel

I am trying to run new ground wires from outlets in the house into my breaker panel that handles an old 2-wire system. There is only one panel after the meter that has the main cutoff, the various ...
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3answers
3k 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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4answers
274 views

Can an inspector require a specific grounding technique?

I had been taking classes to become an electrician at one of the bigger community colleges in my area (specifically LBCC) and my brother had been doing some renovation on his own home and asked me to ...
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3answers
1k views

Grounding an old 2-Wire system in my bathroom

I have been remodeling my bathroom in an old house with a 2 wire electrical system without conduit. It had a 2 prong outlet at the lower wall that I've replaced with a new standard 3 prong. Also I'...
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1answer
155 views

Adding Ground Conductor from Service to Upgraded Sub-Panel

Upgrading electrical system with new 200 amp (main disconnect) service panel then underground 110 feet to house and a new 200 amp sub-panel. There is a 3 wire feed of 4/0 Au in 2" PVC conduit (with ...
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1answer
361 views

How to ground a junction box extension when using a non-metallic box?

I have a water heater that gets electricity from a dryer cord plugged into an outlet on the wall. I need to remove the outlet and replace it with permanent wiring and some form of quick disconnect. ...
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2answers
7k views

Dangers of connecting ground to neutral?

In my living situation, there is no ground wire at the building. There is a ground AND neutral bus in the breaker box, but it doesn't extend to this separate building, which I'm living in. I've got ...
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2answers
4k 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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1answer
280 views

Anything wrong with this ground wire? Is it supposed to be insulated?

Panel is from the late 1970's. Looks like there was some insulation on the ground wire, but most of it has come off. It's the same way through the crawlspace.