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Questions tagged [grounding]

Grounding (also called earthing) refers to the practice of providing an un-energized path back to the main neutral. This is done to allow any electrical faults to flow into that circuit, instead of anyone touching the fault. Use with the [electrical] tag.

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NEC Code requirements for location of neutral and ground connections

I have one 20amp circuit that runs from the panel box to an accessible junction box in my attic via 12/2 romex. This junction box also contains the 12/2 romex switch leg runs of all six lighting ...
0 votes
1 answer
102 views

Stud finder continuously beeping in garage but not inside house

I am trying to find the studs in my garage. When I use the stud finder it continuously beeps. But when I test the walls inside the house it works properly. What is the reason and solution? Searching ...
0 votes
2 answers
105 views

How do I safely ground and bond my circuit?

I'm trying to design and install a very simple little off grid power setup for a one room cabin. It would have a main solar power source and a backup generator. I'm trying to design a simple AC ...
1 vote
0 answers
40 views

How to install 4 wire plug on old Maytag dryer with two ground wires near connectors? [duplicate]

Attempting to ground older Maytag Legacy Series dryer properly with 14-30 receptacle and 4 prong plug. Can’t find a sticker with model info anywhere on the dryer. (Looked inside and out.) Two ground ...
1 vote
2 answers
71 views

Can old EMT conduit be used as a grounding path when it is from an era that did not use grounds?

NEC 358.60 Grounding: EMT shall be permitted as an equipment grounding conductor. I have some old EMT from an era before grounding was common. I need a grounding connection at one end of it and ...
3 votes
3 answers
934 views

Converting NEMA 10-30 to 14-30 using ground from adjacent 15 amp receptacle

In the picture is the NEMA 10-30 I want to change for the safer grounded 14-30. I learned of the danger of this old receptacle here As you can see in the picture there's a ground that I can use to put ...
0 votes
2 answers
2k 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 ...
0 votes
1 answer
127 views

No obvious neutral in breaker box

Just bought a house built in 1960. No grounds to outlets, not a big issue, just GFI the circuits. Bought GFI breakers, for the box. I identified the circuits that need the GFI breakers. There are ...
1 vote
1 answer
92 views

Grounding a dryer to a subpanel

Related to Grounding a 3-prong dryer plug, but with a small twist. I have a NEMA 10-30 that runs back to my main panel. Since we had a leak in the laundry room, I'm having to open the wall. I'd like ...
5 votes
2 answers
3k views

Grounding a 3-prong dryer receptacle

I just bought a house, and my new washer/dryer is being delivered tomorrow. I have the older style 3-prong 240V outlet, which I know I'm allowed to still use. I also have a 2-prong 120V outlet next to ...
0 votes
1 answer
45 views

Does short CSST line off of copper need to be grounded to main panel?

The LP gas in my house runs through soft copper tubing. I am adding a gas range and have a chunk of CSST left from adding heat to an outbuilding. If I tap into the copper and run CSST to the range (...
0 votes
1 answer
70 views

Can a subpanel ground originate from a separate circuit/conduit?

I have a 30amp pool subpanel wired with 10awg THHN through 3/4" schedule 40 PVC conduit. I'm considering installing a heat pump pool heater which will require a beefier subpanel. Can I run 2x ...
1 vote
3 answers
129 views

Do I need to ground the junction box for a security light/camera?

I used an existing Romex cable that was not connected to anything (it has power bc I tested with a non contact tester). I drilled through my plaster wall and fed the cable to the outside. I added an ...
12 votes
3 answers
3k views

Can I use a hose clamp to ground a wire to EMT?

Question: What are the rules for how to attach a wire to an already grounded EMT conduit? Can I use stainless steel host clamp and tighten down? Background: I was installing a metal box for a light ...
10 votes
3 answers
406k views

How should I connect the ground wire for my light fixture?

I am replacing a light fixture in my bathroom and have the following setup: The electrical box is plastic The wire coming from supply has black (hot), white (neutral) and copper (ground). The light ...
0 votes
0 answers
33 views

New Construction Electrical from meter box to: 1-200 amp house service and 1 -separate RV Pedestal with 120 receptacle, and 30 and 50 amp receptacles

We live in Nevada and have 200 amp service. We are running from the meter box to the house (150 ft) with 4/0 4/0 2/0 AL URD to the service panel. We also want to run from the meter to a campground RV ...
2 votes
1 answer
20k views

Can I extend the ground/bus bar in a main service to accomodate subpanel equipment ground?

I am about to replace the main service breaker panel in my house. The old panel (a 200amp Siemens 40-circuit) had bus bars that extended the entire vertical length of the box. The new panel I would ...
2 votes
2 answers
195 views

Can I bond a ground wire to a junction box that is using metal conduit for ground

I'm trying to clean up a situation where there's originally rigid metal conduit and no ground wires from the panel. Someone has added flexible metal conduit at several junction boxes down line that ...
0 votes
3 answers
208 views

not sure why this ground wire keeps tripping the breaker

I'm putting in a new switched ceiling outlet in a garage for ceiling shop lights. I want to have a 2-way switch to allow control from either side of the garage. For some reason the breaker trips if I ...
0 votes
2 answers
2k views

What is a ground loop in an electrical service?

I can't figure out what a ground loop is in an electrical service (residential, commercial, industrial). All I can figure out is that it has something to do with different potentials in the system, ...
0 votes
1 answer
54 views

Using a section of copper pipe as a stop gap for ground

Can I use a 20' section of an exposed 3/4" cold water copper pipe in my garage by attaching a proper ground wire from the breaker panel on one end and using the other end as a substitute ...
22 votes
4 answers
11k 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 ...
0 votes
1 answer
60 views

Is my light switch box grounded and how to use the ground wires properly

I'm attempting to install a smart light switch and I noticed the old one was not connected to the two bound up ground wires in the box. The box itself seems to be painted metal. I assume the smart ...
3 votes
3 answers
123 views

Why do electrical fixtures with multiple live/neutral terminals have only one earth terminal? [duplicate]

As can be seen in this illustration: I became curious about this while rewiring my house recently, in which I've installed a lot of these. Live and neutral almost always tend to have paired line and ...
4 votes
2 answers
458 views

Understanding ground to earth and neutral, trying to make my home safe

I've been reading for hours and still confused in regards to my situation. I'm trying to improve electrical safety in my house, especially with a growing family. Any help would be great. I'm in ...
0 votes
1 answer
116 views

Why did a wire short to the metal junction box without tripping the breaker?

I opened up a junction box to reconfigure two switches. I turned the breaker off and unscrewed one switch and all of its wires. The hot, neutral and ground were separated so they wouldn't touch. I ...
0 votes
2 answers
1k views

Why American homes are wired TNC-S and not TNC

I wonder why American buildings are mostly grounded TNCS and not just TNC. They have virtually no RCD protection, and also an RCD could work fin on TNC system as long as PE on outlet is connected on ...
1 vote
1 answer
79 views

Will running a wire from a PSU screw to my metal window sill do anything?

I recently moved into an old apartment with no ground in the wiring. An electrician checked, and it needs to be retrofitted for ground. This requires approval. In the meantime, I need my work station ...
1 vote
1 answer
2k views

TV antenna installation: How to ground

I'm going to be installing a TV antenna with a mast. I want to make sure I ground everything properly. As far as I can tell, I need to ground the antenna via the coax and a grounding block, and then ...
3 votes
1 answer
294 views

Stove plug wiring

This guy was installing a stove plug and the only wires inside were size 6 and 2 hots and a ground and he split the ground wires in half and put half on the neutral screw and half on the ground screw ...
0 votes
1 answer
83 views

Proper Connections for a Light Switch

I had an electrician out this weekend and he replaced 3 light switches. I just opened two of them to check and I noticed that none of the wires are wrapped around the two gold screws or the green ...
5 votes
2 answers
273 views

Why is my electrical panel buzzing?

I hope you can help me identify where this is coming from. First my electrical is all metallic with 2 wires only, and ground via metal conduit. After some troubleshooting I've found the following: On ...
7 votes
3 answers
2k views

Should I cut or detach a ground wire for a light fixture to remove it?

I have a chain hung luminaire light fixture in bathroom. I am replacing light fixture and the ground wire is preventing me from removing it. Cut it? I have heard different things to remedy the ...
0 votes
1 answer
65 views

Can I connect a ground rod to a wire on my backyard

Long story short, my mom's kitchen got a renovation, the house had no ground (old house), the electrician punt the colored wires correctly including a ground that I asked him to, but now that they are ...
0 votes
0 answers
61 views

Is there an earth bridge missing in my PV installation?

In the DC installation depicted in the following image, is there a bridge missing in the earth distribution in the center? The top right earth wire is coming from the potential distribution rail ...
0 votes
0 answers
28 views

Static shock on a device on a different circuit causes PC keyboard backlight to blink

When I touch an electric space heater, sometimes there'll be a static discharge. No big deal but what's odd is that every time this happens, the backlights on a USB keyboard plugged into a PC blink ...
0 votes
2 answers
5k views

Should I use /2 or /3 cable for a NEMA 6-20R oulet?

I need to wire up a NEMA 6-20R and have both 12/2 and 12/3 cable available to me. Most diagrams I’ve seen show the hot’s to the horizontal spades (X and Y) and the bare ground to the Ground lug on the ...
5 votes
3 answers
3k views

Does every single ground wire in a box have to connect to every other ground wire within the confines of that same box on one branch circuit?

I have a 3-gang plastic box with six conductors that enter the box; three line-side, three load-side, and they pass through the three switches in pairs of two. The load-side wires are all on the same ...
3 votes
2 answers
91 views

Grounding for junction box above panel

I'm planning to mount a 12x12x6 junction box above my new panel to extend some wires that do not reach into my new panel and add CT's for energy monitoring. I saw an electrician on Youtube that ...
1 vote
1 answer
3k views

Installing an additional ground bar in a vintage main service panel

I'm in the process of attempting to perform some cleanup in this panel and also reconfiguring and adding several new circuits. This panel is a vintage Westinghouse/Bryant Electric 100 amp main service ...
0 votes
1 answer
201 views

replacing my old galvanized pipes with pex, what do i do with the ground wires

so ive got galvanized water lines servicing my house, along with that 6 or 7 wires that are clamped to the pipes,im going to relace everything with pex, im pretty sure i cant just clamp the wires back ...
0 votes
1 answer
54 views

Grounding for exterior cable/phone interface boxes

I have a cable and phone (currently unused) media boxes on the outside of the house to which the service is connected from the alley aerially. The picture does not show the conduit that goes between ...
7 votes
2 answers
3k views

Are two prong metal space heaters safe?

I've had this electric space heater for probably about twenty years. Its one of those long and thin ones that does not have a fan. It is a Convectron by slant fin model CVE1500. The plug is two ...
12 votes
2 answers
2k views

Does NEC allow a metal box to carry the ground connection between separate conductors?

I found this box: You can see that most of the conductors have their grounds crimped together in the deep part of the box. A box extension was added to this at some point, so it is rather deep, but ...
2 votes
2 answers
161 views

Emergency Disconnect Ground Questions

I want to start by saying I’m not an electrician. I’m building my own home and I’m doing the electrical myself. This is completely legal in my state of Maine. I have a question on how to properly ...
1 vote
0 answers
71 views

How to properly ground panel box if I'm replacing all copper with PEX?

So I've got a 1950s house and I'm in the planning stages of a project to replace all the copper plumbing with PEX. The copper is in really bad shape, there are ancient gate valves all over the place ...
0 votes
1 answer
95 views

Neutral Ground Bonding with 2 Main Breakers

My electrical service has a meter outside, followed immediately by a 200A breaker, then feeder wires head into my basement and supply a “main” panel with another 200a main breaker. This main panel has ...
5 votes
2 answers
590 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. ...
11 votes
6 answers
37k views

Acceptable ground to neutral voltage?

First of all I'm pretty sure I know the theory behind the effect. I know about the inductive and capacitive coupling, about 3-phase balance problems and about ground bounce, so this question isn't ...
1 vote
1 answer
57 views

Ground rod to exterior disconnect panel routing & panel attachment

I'm getting my shop power reconnected after prior storm damage and the inspector said he'd need to see a ground rod connection to the panel. I've included pictures of the existing ground rod though it ...

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