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
157 views

If my heat pump does not have a neutral, do I still need a neutral wire?

I had a friend wire 10-3 line for a new heat pump. He connected the red and black conductor wires in the house to the 2-pole 60 amp breaker and the neutral white to the neutral bus bar. The outdoor ...
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56 views

Shared ground for 3 circuits

My septic system requires 3 circuits. A 10Amp & 2 20Amps. Using schedule 40 conduit in a 80ft run underground to the 3 pole emergency service disconnect. Can these three circuits share a ground? ...
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26 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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1answer
44 views

How to add grounds to a 120 amp panel and grounds electrical outlets

I'm buying an older home. The inspection showed no ground on the panel and no ground on some outlets. I'm assuming the outlets are near water, sinks, etc, that need the reset protection. I currently ...
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46 views

Will improved panel grounding resolve AM radio static?

I live in a manufactured house. I have two electrical panels--one outside on the electrical pole where the electrical meter is at and another one in a utility room in the house. The one on the pole ...
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1answer
216 views

Why is neutral wired to ground at this switch?

I was looking to add an outlet near my light switch in the garage. When I opened the box for the switch I noticed that the neutral is wired to the ground. In the picture of the switch, the top wire ...
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2answers
93 views

Does the ground wire for my pool connect to the pumps?

I am in the midst of a new gunite in-ground pool install. I have the electrical background to tackle this job but I want to know I have it right, particularly around the bonding and grounding. I got ...
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1answer
104 views

Is it possible to charge a battery from a live with without creating a second ground? [closed]

This came about out of a conversation with a friend and we were wondering if it was theoretically possible to power a device with a hot wire and have that device's neutral/ground be attached back to ...
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1answer
66 views

Is my ground correct at my subpanel?

I have a subpanel at my garage. It has 2 hots, one neutral and one ground from the service panel. The neutral and ground in the subpanel are not bonded. All the outlets including GFCIs all work ...
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1answer
46 views

Intersystem grounding bus ran out of terminals; now what?

My intersystem grounding terminal bus is out of available terminals, and I have two additional communication wires to ground to it. Does NEC allow supplementary bus bars? NEC 250.94 seems to imply no, ...
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1answer
92 views

Grounding a 3-wire sub-panel in attic

Early 1960's home. 200-amp main service panel on first floor. 3-wire (L-L-N) feeder to 100-amp sub-panel in the second floor attic, about 25-30 feet from the main service panel. Neutral and ground ...
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1answer
223 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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1answer
45 views

Does a ground need to be install in a 2' x 4' outside junction box?

i have a bunch of outdoors 2' x 4' open bottom concrete junction boxes. the question is, does each box need to have a ground rod installed and bonded to the ground wire? if so can someone please point ...
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44 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
216 views

Trying to install Kasa smart switch but having trouble with ground wire

I started to install my KASA smart switch but when I opened the unit I wasn't able to find a ground wire. I currently have two black wires (one stabbed into the switch and the other is wrapped around ...
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3answers
240 views

help me interpret the results of an outlet tester on some GFCI receptacles

I'm trying to figure out what might be wrong with some exterior GFCI receptacles that I have. The problem is that this is an old house, and I'm not really sure what is happening between the ...
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1answer
55 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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2answers
67 views

Do I need to install a local ground point for a secondary consumer unit in my shed?

I've just installed outdoor sockets on the side of my brick shed, where previously we just had a double socket inside the shed itself. The original socket in the shed is on a spur from the ring main ...
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1answer
905 views

What is the difference between a coaxial grounding block, an antenna discharge unit, and lightning arrestor

I've been reading about grounding outdoor TV antennas but these terms seem to be used interchangeably by various articles on the internet. For example, this article seems to make a distinction ...
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2answers
153 views

Grounding Rod for Residential application

I currently live in Florida, where the soil is basically sand and clay. My question is: how should my grounding rod for my house be installed? I've managed to dig up the grounding rod that was ...
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1answer
96 views

Grounding to the box and 3 Prong Receptacles

Recently bought a flip house. The flippers replaced every two prong receptacle with a three prong and a bootleg ground. In the process of undoing that unsafe practice, I've discovered that almost all ...
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3answers
222 views

How to mark an outlet as ungrounded

I'll be replacing my ungrounded three-prong outlets with tamper-proof GFCI outlets in my home in the USA. Maybe I'm overthinking this, but is there a way to 'universally' mark the outlets as ...
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2answers
889 views

Adding a ground wire to old 2 wire wiring before extending to grounded wiring.

I am remodeling a house and the partially unfinished attic has old ungrounded, 2 wire wiring. There are 2 circuits. There is a finished bedroom with one circuit on 3 walls, and a second on the 4th ...
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2answers
1k views

200amps service - ground rods instead of pipe connection

I upgraded my main circuit breaker today from 150amps to 200amps. See my previous posts here on the same project: Is RC2040M150CH MSP upgradable to 200amps main circuit breaker Neutral on main ...
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2answers
457 views

How can I connect a new ground rod?

Illinois house, built 1963. Not sure if there is a ground rod or just the water pipes used for ground. Want to put in another/first rod. Can I connect it to the clamp on the electrical meter housing ...
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5answers
2k views

Why are ground wires required to be so large if a short results in an immediate breaker trip?

The purpose of ground wire is just to carry current in milliseconds enough to trip the circuit breaker, it won't even get hot. So what is wrong with using very small ground wire? For example. You are ...
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138 views

Would my grounding conductor be “choked” out by metallic conduit?

I’m in Hawaii. The G.C./engineers have told previous electricians that they want the bare ground coming up through slabs to building steel to be in a short piece of rigid conduit for protection of the ...
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2answers
623 views

In 2/3/4 gang box, should you combine all grounds using crimp connectors?

When I have multiple lines going in/out of a 1 gang box (with an outlet/receptacle or switch), I typically combine all the grounds into a single wire using crimp connectors: However, when working ...
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172 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
68 views

GFCI Grounding Issue

I'm trying to replace a two prong outlet in my garage with a GFCI. The receptacle line is fed from a light switch on the wall, and the load runs to an outdoor(one bulb) lamp post. The general ...
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1answer
1k views

Main Panel with separated neutral and ground

A customer of mine had a friend wire his basement. He did a neat job, but when I opened up the mailnpanel to add a circuit, I noticed he had installed ground bars and separated them from the neutral ...
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2answers
154 views

Off Grid PV System Grounding Question

Hi I am installing an off grid solar system form my orchard and shed. Basically there are some pumps, lightning and some household appliances like refrigerator etc. I have read many articles about ...
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1answer
43 views

how to replace surface conduit for a two-wire lighting circuit?

I have an old house with unswitched knob-and-tube running to a ceiling fixture. Previous owners ran surface conduit to a wall switch and to a second light fixture over the sink; none of this was ...
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1answer
674 views

Neutral wire is tied to my electric metal box, why is it so?

I have this old Depard switch box in my patio. Originally, I wanted to 'add' a receptacle in my old Despard switch 'array' stack. Now I am puzzled and afraid of doing that because I found out that ...
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2answers
910 views

What to do with dimmer ground wire?

I am replacing an old dimmer switch with no ground wire with a dimmer switch that has a ground wire. The metal box in my wall is grounded, but there is no ground screw or anywhere else to attach the ...
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2answers
338 views

Is this ground attached to the wrong water pipe? [duplicate]

I recently noticed that I have ground wires attached to metal water pipes in my home, as shown in the following image. The area marked A is where the water service enters the home with that blue ...
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1answer
686 views

Can I run a new ground wire from junction box in attic down the wall to replace 2 prong outlet

I have an older home where some of the house has updated electrical and some doesn't. In a few rooms I still have several of the 2 prong outlets with no ground wire in the box and I want to replace ...
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1answer
77 views

Is it OK to have a redundant path to earth?

I have a home with separate flat on the grounds. Our system, in South Africa, has 230V live and neutral, supplied by the national grid operator through a distribution board, via isolator. It then ...
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1answer
176 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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1answer
81 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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1answer
363 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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0answers
67 views

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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2answers
1k 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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1answer
2k views

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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1answer
197 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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2answers
936 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
2k 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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1answer
199 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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2answers
88 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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3answers
54 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'...