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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Main panel grounding modification (two grounds in box to single ground wire)

My old house’s main panel has two ground wires, one leading to pipes, another to a grounding rod. Because the bottom is the only easily-accessible side for new circuits, and because most of the ...
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NEC connecting EGC directly to GEC? [closed]

In the 2017 Edition of the National Electric Code, (1) in (B) and (1) in (C) both in Section 250.32 specify, An equipment grounding conductor, as described in 250.118, shall be run with the supply ...
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How do British do earthing at dockside?

John Ward has an interesting video about the British TN-C-S grounding system. This is where the utility delivers Line and Neutral, and the dwelling does not have local ground rods and takes ground ...
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solution for missing ground wire from main Breaker

I have two sub panels. The first sub panel is fed by the main panel. The 2nd sub panel is fed by the first sub panel. The main and 1st sub were replacements from FPE panels. My situation is ...
1 vote
1 answer
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Troubleshooting a broken ground wire and an energized drywall panel during circuit trace testing

I have a wall in my garage which has (on the same circuit with a breaker) 4 outlets and an outdoor light with a switch. For the sake of this question and attempted schematic below, I will use the ...
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5 votes
1 answer
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How is a Ufer ground attached to the panel?

I am planning a addition to my house. I'm not sure of the current state of the house's grounding system (built in the 1890s, last updated in the early 1970's by my estimation, so "minimal" ...
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4 votes
2 answers
172 views

Utility requires EGC wire to be bonded in meter can, do grounds and neutrals have to be separated in main panel?

My utility requires a bare #6 wire to run from the the rods to the meter pan and be bonded with neutral. The wire then runs to the ground bar in the panel. I have an old panel with only one bar for ...
0 votes
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Is there a reason the electrician didn't ground this generator voltage selector switch?

I have a cabin where the only source of power is a generator. The plugs that I can plug into it look like this: One plug is 120 and one plug is 240. The larger box above allows me to switch between ...
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1 vote
4 answers
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What if I can't drive a ground rod far enough?

We live on a pile of cobble and boulders (glacial outwash) which makes driving ground rods close to impossible. Is it permissible to bury a ground rod or a plate, and if so, what are the requirements?...
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1 answer
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My AV rack (metal) is close to the grounding rod & my receiver/projector frequently get fried [closed]

Dumb me ! my receiver/projector has been fried 3 times & I had tried everything: Called in an electrician Installed circuit breakers Cried.. But it kept getting fried ! And today when I was ...
2 votes
1 answer
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What type of old cable is fed into this outlet, and what is the bare copper if the junction box doesn't seem to be grounded?

I have a groundless outlet that I'm attempting to add a ground to. The breaker that this circuit is tied to is a one pole AFCI, and it seems this is the only outlet on the circuit for the time being. (...
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3 votes
3 answers
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How to correctly ground BX cable in a plastic box

First off, I fully acknowledge that this may not be possible, CORRECTLY... but I have a 1939 house that has been through several generations of electrical wiring. The main panel and a lot of the ...
11 votes
7 answers
5k views

Why is 'Ground' important?

I'm failing to understand why ground wires are important in electrical outlets. They don't protect me if I shove a knife into the outlet. Without a GFCI, the circuit doesn't "know" there is ...
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1 vote
1 answer
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What size grounding rod(s) for 100A subpanel in Northern NJ

The house we bought has a detached garage built from cinder blocks perhaps 50+ years ago (with no copper plumbing), and had only one 20A line installed underground from the home. I'd like to install a ...
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1 answer
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1 Volt reading between hot phase of sub panel and enclosure and frame

My grounding bus in my subpanel, which is secured to the panel frame, reads 122 VAC to hot phase which is great. I also get 122 VAC from hot phase to neutral bus. Shouldn't I also get 122 VAC +/- ...
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1 vote
1 answer
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Vanity Light Install

I bought an led mirror for our bathroom and can’t figure out how to connect it. The mirror has only a black and white wire while the wiring from the wall has 2 white wires, 2 black wires and 2 green ...
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1 answer
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Help identifying ground screw?

I’m installing a ceiling fan and my electrical box doesn’t have a ground wire. Are either of the screws in the picture a ground screw?
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1 answer
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Does anyone know what the black cables that are taped together, and how do I get this grounded?

I went to replace a light in my hallway and there is no ground wire. There’s a red wire connected to the black wires from the light and a white wire. I noticed a bunch of black wires taped with ...
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0 answers
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Lampholder with Socket but no Ground Wire

I was replacing a ceiling lamp holder with chain with a new unit that has a socket however the metal electrical box has 2 wires (black and white) but no ground wire. I replaced it and it is working ...
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Is red wire used for earth in very old German machine mains plug?

Which is neutral and which is earth? It seems that Black = Live, Grey = Neutral, Red = Earth Was this assignment common in 1960? How can I be sure?
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1 vote
1 answer
62 views

Does sprinkler control wire entering the house need to be grounded?

I'm installing a sprinkler controller in my basement. I will be running control wires and sensor wire from the outdoor valves into the house. Does these cables need to be grounded? If so, how? ...
0 votes
0 answers
25 views

DIY new vanity light fixture [duplicate]

I'm installing a new lighting vanity fixture. I have black, white and copper grounding wire coming out from the new fixture. I have black, white and stranded copper wire coming from the terminal ...
2 votes
1 answer
68 views

Retrofit grounds

I have a 1950's bungalow which originally had ungrounded outlets. Before we bought the house, someone decided to install 3-pronged outlets by fishing 14 AWG THHX green wire up through the exposed ...
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0 votes
0 answers
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Hot to ground voltage reads ~1 volt but breaker is not tripped

Summary: I'm seeing a very low voltage read in between the hot wire and the ground in a switch. Yet the circuit breaker isn't tripped and everything works fine. Should I do something about it? If so, ...
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Does this Wiring Diagram Create ground loop Issues?

I have a two x LV6548 Pure Sine Wave 6,500W Inverter/Chargers - 13,000W Continuous Output 120/240V Inverters that I wish to integrate with my Subpanels in the house for Off-grid with Main Utility ...
0 votes
1 answer
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240v panel-no neutral

This is the culmination of a few posts (Disconnecting 240 hots without disconnecting neutral?, 240v only subpanel, no ground?) to see if this seems right. I had a subpanel A with 20A double pole ...
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3 votes
1 answer
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Grounding Help! (System equipotential bonding vs Array bonding vs AC conductor PEN earth stake)

I've been doing a lot of reading trying to get my head around what the right grounding system is to implement for a theoretical small PV minigrid (<10kW with distribution distances <300m), ...
2 votes
2 answers
241 views

What to do when there's is no ground wire available in old box?

I recently decided to change my hallway light. My house was built in 71 so the wiring is obviously not that new. I used a voltage meter to determine my hot and neutral wire but I have no idea how to ...
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Any reason NOT to go whole hog in surface prep for installing earth-ground bonding clamps above ground outdoors?

Background I'm tidying up the various outdoor bonding to earth ground in my 1960s era suburban Calif. house. Bare copper wire, either 6 or 4 gauge, will connect them to the appropriate termination on ...
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2 votes
1 answer
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What is this box of wires?

Does anyone know what this small box of wires are? Seems to have a bunch of potential ground wires gathering here. The box itself is just screwed to the house. Some wires go to the telco box, one to ...
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2 votes
1 answer
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Grounding Main Sub-panel Sub sub-panel

I have a 200A main panel installed in our garage on an exterior block wall (single family, residential, construction in 1980). A sub-panel was added next to the main panel supply via a 100A breaker (...
26 votes
2 answers
5k views

The main ground on my house sparks when an appliance is turned on

When turning on high amp appliances like an air compressor or dust fan, the attachment of the ground from the meter box to the water main (pic) sparks occasionally for a second or so. A separate ...
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5 votes
2 answers
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Where to land ground in main panel

If one were to add a new branch circuit to this panel and didn’t want to use metal conduit, where would you land your ground wire to? Would you need to add a grounding location to the panel?
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3 votes
1 answer
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So is my 1950s/60s era 2-prong outlet junction box grounded or not?

Background: The kitchen area outlets, all 2-prong, seem to be original to our 1950s California house, or perhaps modified in the late 1960s. In preparation for installing a grounding wire "bus&...
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3 votes
2 answers
270 views

Hang ceiling fan grounded box but no ground wire

I'm trying to hang a ceiling fan and connect the ground wire from the mounting plate but I don't have any ground wire coming from my box. I have verified that the box itself is grounded though by ...
6 votes
2 answers
2k views

Why would bridging Neutral and Ground trip a GFCI breaker?

I have a main breaker + GFCI combo breaker in my panel. I decided to do some work on an outlet and accidentally bridged ground and neutral, with the room breaker off and the live wire dead. The GFCI ...
4 votes
2 answers
244 views

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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1 answer
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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 ...
6 votes
3 answers
965 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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2 answers
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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 ...
0 votes
0 answers
34 views

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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1 vote
0 answers
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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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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 ...
0 votes
1 answer
157 views

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 ...
4 votes
1 answer
247 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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