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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200A Meter Socket Ground / Bonding Strap

I'm replacing a meter socket (upgrading to 200A) operating under NEC2017, and saw something I didn't see on the old socket. Current setup - a 200A capable main panel, with 4ga stranded wire coming out ...
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Grounding a Legrand Metal Wall Box from existing box that's too short

What would be the proper way to ground this new Legrand Starter Box (BW5) if the ground cable inside the previous box and it's too short to reach the new box or receptacle? The original cabinet ...
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6 votes
3 answers
900 views

Is my plan for incremental addition of grounding to home outlets safe and code-compliant (US in 2022)?

Background: 1950s single story ranch style house in California, late 1960s split bus electrical panel (100A service?), outlets in house are seemingly all 2-prong ungrounded. Electrical panel is on ...
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2 votes
1 answer
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Can I reuse an existing grounding rod and water pipe ground location?

Apologies for the dual question, but it's within the same topic, so hopefully it won't be too out of bounds. Situation: Upgrading to a 200amp panel requires ground upgrades at the residence in ...
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1 vote
1 answer
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Grounding electrode conductor

I am installing a 125 AMP OUTDOOR MAIN LUG LOAD CENTER which will be protected by a 100Amp CB. The panel will support all the equipment for an inground pool. I have installed the pvc conduit ...
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Replacing Power Cord for Electric Chainsaw

I have an old electric chainsaw, and want to replace the power cable as it has an old two pin fitting that doesn't match newer ones. I'm going to replace it with a three pin (I'm in the UK) plug that ...
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1 vote
1 answer
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Replacing sub panel, grounding electrode conductor

I am replacing the 200 amp sub panel in the basement, and trying to understand if it is required to run the grounding electrode wire to that sub panel or not. Currently, there is no grounding ...
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0 votes
0 answers
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What type of clamp to run bare copper from a j-box?

Need to run a #8 or #6 bare copper from a j-box of another branch. What type of proper strain relief clamp do I need for that? Is it a "Kenny Clamp" or are there any other solutions that are ...
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Grounding An Electrical Receptacle Inside Enclosure

My company ordered several power cabinets to use mains power from a generator to power some DC equipment on a truck. We also requested a NEMA 5-15 duplex receptacle on the front for ancillary loads. ...
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3 votes
1 answer
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Is it possible to add a retorfit ground wire to a (3-wire) Type SE, Style U cable from another branch?

Would it be possible to add #10AWG GROUND from another branch (hot-water heater 30A circuit) in order to retrofit ground and replace a 3-wire receptacle with a 4-wire one to be able to use it for an ...
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1 vote
1 answer
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How to wire this 4-wire range terminal block with pin style connectors?

Could you please help me determine how to properly replace this 4-wire cord that has pin style terminal with a 3-wire cord that has ring style terminals? terminal block on the range: old 3-wire cord ...
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0 votes
3 answers
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Is it ok to have a ground Rod and a forth grounding wire in subpanel

I have an outbuilding (200 ft from house main panel) I have run a 4 wire to the subpanel but wanted to put a Ground Rod in after reading some things. Is it ok to have both or do I need to disconnect ...
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0 votes
1 answer
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How do I attach the ground wire to my new chandelier?

I have a new chandelier, all metal, hanging in the office. It only has positive and neutral wires coming from lights up metal chain to connect in the junction box. A small ground wire is attached to ...
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4 votes
1 answer
234 views

Multiwire Branch circuit and ground

I have a multiwire beach circuit which feeds the furnace and the laundry area. At the junction box where the neutrals are tied together, what do I do with the ground wires from each circuit (furnace &...
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1 answer
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Why Do Detached Structures Feeder Panels Require Grounding Rods?

I'm trying to figure out exactly why the NEC requires separate grounding rods for detached structures (250.32). Normally a ground is attached to a neutral bus, but in a feeder panel it has to be ...
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0 votes
3 answers
100 views

Does the NEC require ungrounded receptacles to be GFCI-protected when the panel is updated?

My son recently moved into a house built in 1957 that has an updated panel with ground connected to the bus bar. However, the receptacles I've checked are old two-pronged receptacles in metal boxes ...
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3 votes
2 answers
637 views

Should a subpanel in the same building have its own grounding rod?

I'm installing a subpanel on the opposite side of my home. To be clear the subpanel will be attached to the same structure as the main panel (the main panel does have a grounding rod), just on the ...
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8 votes
3 answers
720 views

Alternative GFCI Wiring in Strict 240V Scenario?

I have a strict 240V wiring situation (i.e., two hots + ground, no neutral) with a hot tub as the only load on the circuit. Now, I think it’s very prudent (and generally mandated) to have a local ...
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3 votes
2 answers
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Why do we still need protective earth with an RCCB/RCBO?

If most of your devices at home are already double-insulated, does the protective earth still serve a purpose when you have an RCCB/RCBO installed in your panel board? I'm asking this since I live in ...
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0 votes
4 answers
157 views

Ethernet ground loop detection

Two buildings are separated by approximately 8 feet. A PEX pipe shielding a CAT5e ethernet was buried 8 inches underground. If each end of the ethernet cable is connected to a switch, I am concerned ...
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2 votes
1 answer
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Interaction between a circuit breaker and a switch

This is a very basic question which I'm sure has already been asked and has a simple answer, but I was unable to get a satisfying straightforward explanation via an internet search. Suppose I have a ...
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1 vote
1 answer
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Do I need to add a ground rod, if this pipe is changed?

Panel is currently grounded, using 6ga stranded, that goes about 10 feet or so and attaches to the galvanized water supply in the crawl space. I'm in the process of switching to PEX, BUT where the ...
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7 votes
4 answers
2k views

How dangerous is it to use ungrounded outlets with a home-office setup?

I just moved into a new apartment (in Canada) and discovered that although the electrical outlets have three holes in each socket, there is no functioning ground in any of them. I confirmed this with ...
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3 votes
1 answer
57 views

Suitable run type for 4 gauge copper ground wire connecting buried grounding rods?

The earth ground for our circa 1968 outdoor electrical panel in California is apparently a single maybe 8 gauge(?) solid copper wire running from a capped galvanized pipe driven into the ground (50+ ...
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-1 votes
2 answers
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is it reasonable to use a separate grounding rod for TV antenna?

I want to run grounding wires from the antenna and mast to a grounding rod for lightning protection. But the most direct route from roof to ground is on the opposite side of the house far from the ...
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2 votes
1 answer
156 views

"Lending" the ground wire of a 120V/15A circuit to a 240V/30A circuit

I have read in a previous forum post Is it OK to borrow a ground wire from a different circuit? that NEC in article 250.130(C)(4) allows the grounding of an ungrounded circuit by connecting to an ...
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1 vote
1 answer
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How do I check ground on incoming power

I have a unique problem, three dual function breakers trip at the same time with a ground fault indication. This mainly happens while asleep or if it happens during the day, I'm of course at work. ...
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2 votes
3 answers
189 views

How to determine which wire in a light switch is live?

I am in Belgium and houses here have 230 V. I replaced a light switch recently and it had one spot for the live wire and one for the neutral. I used my multimeter to try to determine which wire was ...
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1 vote
1 answer
192 views

Is copper antioxidant paste use for copper wire connections now recommended in USA?

We will be improving/replacing our electrical service's earth ground, currently a galvanized pipe in the ground with a maybe 10 gauge copper conductor leading to 1970ish split bus Square D electrical ...
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3 votes
1 answer
164 views

Can I install a ground bar in an 8x8 junction box for splicing cables?

I had a sub panel put in a few years ago but recently upgraded our panel. My county inspector said I could splice the short wires to get them inside the panel. I bought a box and I have 8 circuits ...
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5 votes
1 answer
92 views

Microwave on A leg causes B leg voltage to increase, neutral issue, but how to diagnose?

I'm having an issue with flickering LEDs, the PoCo came out and upgraded my service with a brand new transformer and wiring, they did a power survey before and after and said their side is good now. ...
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1 vote
1 answer
104 views

Can I run a ground wire (6 awg bare copper) outside the 6-6-6 (2 hots & 1Neutral) that are in conduit for a 50 amp RV Service?

The main panel of the house already has a 50 amp breaker. There is 6-6-6 Awg wires and a bare copper ground coming from the breaker to the corner of the house that was used for a spa that is no ...
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6 votes
2 answers
723 views

What is "functional earth"? (In the context of an electrical socket)

I have this wiring diagram included with a UK 3 pin double socket with a USB port. What does "functional earth" mean? On the physical socket it appears to be bonded directly to the regular ...
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6 votes
1 answer
444 views

Is it OK to use the two separate earth cables in a mains socket, one for the socket and one for the mounting box?

I'm fitting a replacement electrical socket. (UK 3 pin double socket with a USB port). Just the front plate, the mounting box that is already there is staying. I have the wiring diagram below. In the ...
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1 vote
0 answers
77 views

Using a UPS on 3-prong, ungrounded outlets and worrying voltage leak

it seems this question is rather common. I live in a rented appartment built 70+ years ago. Back then, the building was built on a budget, and it was code-compliant to have ungrounded 1-phase 120VAC ...
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1 vote
0 answers
121 views

House built in 2010 - where's the grounding rod?

This is the main panel outside the house (a subpanel is inside the house right behind it). I was wondering where the grounding rods are (I think they've been required by code for a while?), but I can'...
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4 votes
3 answers
1k views

Properly grounding junction box for conduit transition

I just want to confirm I have my wiring down correctly. I live in the US (upstate NY) which is under NEC regulation; no local code regulations added on top of NEC. I am installing a new outlet (120V/...
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0 votes
1 answer
82 views

Subpanel Grounding

I have an existing wire run from my main panel on the house to a detached garage with three wires: Red, Black and White. No ground. I want to install a new subpanel in the garage. I'll be installing ...
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0 votes
0 answers
38 views

Installing a light with no ground & no accessible outlet box

I'm replacing a light in our bathroom. I unscrewed the old light from the wall and found this: The ground wire for the original light fixture was attached to the metal mount that held the light to ...
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6 votes
2 answers
1k views

What does it mean if the electric is out in a room, but the breaker is not tripped?

Earlier today I noticed a light go out, and of course everything else that was in the room went off as well. I went to the breaker box to check and see if the one for that room had tripped, but it had ...
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1 vote
1 answer
119 views

Help replacing a bathroom vanity light fixture with no ground wire in metal clad cable

Attempting to replace a bathroom vanity light fixture, removed the previous fixture and found a rough hole in the drywall with metal clad cable containing only 2 wires (yellow and white) - no ground ...
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0 votes
2 answers
122 views

Sub panel grounding for detached garage

I am installing a 40 amp sub panel in my detached garage. I understand I need two ground rods for the sub panel in the detached garage. Since I am feeding the sub panel with a ground wire from the ...
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0 votes
1 answer
69 views

FMC as ground through the house

Is it acceptable to use FMC as a ground from the outlets to the box? I see in the electrical code it says it can be 50ft for a branch circuit and 6ft for a feeder. I'm just really looking to ...
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1 vote
2 answers
203 views

What does the ground wire on a light's mounting bracket connect to?

I am replacing a chandelier in our dining room. I turned off the breaker and took the chandelier off and see two wires (hot and neutral): The replacement light only has two wires (hot and neutral): ...
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5 votes
2 answers
303 views

Receptacle Grounding for a Sump Pump

I have installed a sump pump in the basement. This house was made in the sixties so it has a two prong receptacle and does not have a ground wire available. I put a GFCI receptacle to plug the pump ...
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2 votes
3 answers
161 views

Ground wire needed for long runs

I want to add some 20 amp patio outlets to the back of my house. The farthest outlet would be about 100 feet from the main panel. Normally you could use 12 gauge wire when dealing with 20 amps, ...
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1 vote
1 answer
83 views

Surge Arrester/Surge Protection Device (SPD) Type 2 Installation and its external Short Circuit Protection Device

BACKGROUND I live in a small town where it is difficult to find certified electricians. In fact, electrician certification is not common for residential installations. I did find some experienced ...
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2 votes
0 answers
114 views

Ground Rod in Raised Garden Bed

My detached garage has a subpanel fed by 3-wire plus ground from the main panel on the house. It's 8AWG copper conductors plus 10AWG ground breakered at 50 amps. In the distant future I may run new ...
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0 votes
2 answers
112 views

Ground wire in subpanel

I'm adding a circuit to a subpanel in my garage (built in the late 70s), and I've been reading a lot about subpanel ground / neutral bonding (how it's not supposed to be bonded at the subpanel, and ...
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0 votes
1 answer
79 views

How do I ground two switches from the same box with one grounding wire?

I have a kitchen light with two light switches. One has been a dummy one (we thought) for 15 years until my husband went to replace the old faulty switch which operates the kitchen light. He replaced ...
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