Questions tagged [grounding-and-bonding]

For questions dealing with grounding and bonding of electrical installations, and the specific requirements of such.

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28
votes
5answers
45k views

Is it OK to borrow a ground wire from a different circuit?

I've got a circuit in the basement carrying a handful of outlets. This circuit has no ground wire. I want to add a couple of outlets and want them to be grounded. I may even want gfci outlets on ...
7
votes
2answers
54k views

Is an explicit ground wire required through steel conduit?

We just bought a Chicago-area house and found that there's no ground wire in some of the recently re-wired areas. I thought that the national electrical code requires a ground wire for new ...
3
votes
3answers
34k views

House wiring and grounding. How do you retrofit an old house and ground it?

A contractor looked at our house and told me that you can't fix a house (with old wiring) that has some outlets that are not grounded. He said that you can go on YouTube and search the internet and ...
0
votes
1answer
420 views

What does this answer about old residential home grounding mean?

If you do not have a ground wire installed with the other wires do not hook up the ground wire without knowing how the wires were carried to the box. If the house is wired with flexible metallic ...
15
votes
1answer
3k views

Is this box bonded properly to the ground?

The receptacle is from the mid-1950's and my multimeter shows that it is grounded. There are a solid 120 volts when testing between live and ground. I noticed a bare copper wire coming from the cloth ...
6
votes
1answer
4k views

Is there a reason to prefer bare wire for Grounding Electrode Conductor?

Is there a reason I should use bare copper instead of THWN for a grounding electrode conductor (e.g. bonding water pipes and ground rods; not an equipment grounding conductor)? I cannot find anywhere ...
2
votes
2answers
2k 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 ...
3
votes
2answers
1k views

Why didn't homeowners get electrocuted when appliances were grounded through the neutral?

I read that appliance at certain times in the U.S. (for example stoves) were grounded through the neutral wire. Since the neutral wire carries current does this means the case of the stove itself is ...
1
vote
1answer
86 views

QO Main Service Panel - Ground lug question - CT resident

I have a fairly new QO main svc panel (QO142M200PCAFVP) which is being used as a service panel (bonded, not a sub-panel). The green screw (top right) bonds the panel appropriately. The main 3 ...
5
votes
1answer
456 views

How are sacrificial anodes electrically bonded to the water heater?

I was thinking about the sacrificial anode in my hot water heater. It screws in via a hole on the top of the unit. Every time I've made a threaded plumbing connection, I wrap Teflon around the ...
4
votes
2answers
7k views

Why do we need bonding at the gas water heater?

We recently upgraded our electric service...had to put in a new panel, etc. The city inspector came by and said that everything looked good except that we still need to "Bond Hot-Cold-Gas with #6" @ ...
3
votes
3answers
3k views

Can I use Schedule 40 PVC to protect a grounding electrode conductor where exposed to physical damage?

Can I use Schedule 40 PVC to protect a 4 AWG grounding electrode conductor (wire from main panel to grounding electrode) where exposed to physical damage (a few feet between the panel and the ground ...
2
votes
3answers
3k views

2 load centers under 1 meter: do you need bonding and main breakers at both?

Here's my layout as it stands: meter | 200A disconnect, neutral and ground bonded | | | mobile home main panel (200A main breaker, neutral and ground not bonded) I would like to run another 100A ...
2
votes
1answer
191 views

Separating neutral and ground in panel

I have a 200 amp combination disconnect and 10 circuit panel on the pole feeding my 200 amp panel in my house. Is the panel on my pole considered my main panel and the one in my house a sub-panel ...
2
votes
2answers
96 views

Can I use the metal cladding of a cable as ground for this range installation?

I have a pre-existing #6-3 cable (without ground) with metal cladding on a 50-A two-pole circuit that was wired into a range. As shown in the photo, this cable has only black, red, and white ...
2
votes
3answers
4k views

Do I have to connect the grounding electrode at a detached garage to the grounding electrode at the main structure?

Article 250.32(A) of the National Electrical Code, tells us that we need a grounding electrode at a detached garage. It also says that it has to be "installed in accordance with Part III of ...
2
votes
1answer
67 views

What is the appropriate fitting to connect an armored cable to this stand-alone receptacle product?

I have a pre-existing #6-3 armored cable (without a separate ground conductor), as shown here: I am replacing the range this was connected to, and would like to provide a 4-wire connection via a 14-...
1
vote
2answers
361 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 ...
1
vote
1answer
165 views

Can multiple grounding electrode conductors be placed on the same ground lug?

Couldn't find anything in the NEC 2017 that forbids it, but wanted to double check: Can multiple grounding electrode conductors (thick multi strand is the outside-ground-rod wire, thin single 6GA is ...
1
vote
2answers
157 views

Requesting Evaluation of Power Plan at Rural Cabin

What I am looking for is guidance and honest evaluation. I'm not afraid of being wrong. I want to save some bucks and learn some things, without blowing myself up. So please tell me if I'm doing ...
1
vote
1answer
479 views

In a pex household, would it reduce corosion to bond metal plumbing fixtures to my water heater's anode?

A water heater's sacrificial anode needs to be electrically bonded to the tank to function. This is accomplished via continuity through the threads by which it is secured. Knowing this, am I '...
0
votes
2answers
8k views

Bonding Neutral and ground in a service panel

My home has a 200amp meter box with 6 double breakers beneath the meter under a flap - 4 breakers are 60amp (stove heater, AC, unknown) - there are also 2 100amp breakers going to load centers inside -...
0
votes
2answers
662 views

Why doesn't current return via the grounding conductor when it's connected in the panel? [duplicate]

Since the neutral wire and ground wire are connected in the main fuse box then why doesn't some of the returning electricity flow through the ground wire to earth?
0
votes
2answers
1k views

Should I bond neutral in sub panel- there is no electrical ground

I have a question about my sub panel that I'm installing in a shed in the back yard. I'm using a 3 wire feed from the main panel to the sub panel (H-H-N). ...because I'm using the 3 wire feed, I'm ...