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
998 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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498 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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3answers
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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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
277 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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98 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
48 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
102 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
630 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
546 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
12k 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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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
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 ...
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1answer
138 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
7k 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
510 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
113 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
622 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
536 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
206 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
660 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
7k 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 ...
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1answer
109 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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339 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
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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95 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
2k 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
1k 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
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 ...
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2answers
627 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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3answers
24k 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
620 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
424 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
831 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
479 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
83 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
4k 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
173 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
1k 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
2k 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
145 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
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
604 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
229 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
243 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
315 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" ...