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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96 views

How do I ground an AC inverter in a RV?

I am working on installing a Victron Energy Phoenix Inverter 800VA into my little teardrop RV. I am doing something men just don't do, I read the Victron Energy Phoenix Inverter manual! Appendix A ...
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3answers
76 views

Adding Transfer Switch to Main Breaker with no available ground/neutral spots on bus

I am installing a 10 circuit reliance manual transfer switch. I need to install the ground to the ground bar and the neutral to the neutral bar. However, both grounds and neutrals are mixed in my ...
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1answer
61 views

Grounding recommendation at a remote receptacle/ground rod?

My home was built in the 1930s with knob and tube wiring. The previous owner(s) replaced or augmented it, a bit at a time, and when I purchased the home from the last one he said that there was no ...
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2answers
71 views

To use any generator with the house inlet, may one leave the generator ground wire unconnected in the inlet?

tl;dr: To facilitate using any generator with the house inlet, regardless of transfer switch type or generator neutral-ground-bond status, may one leave the generator ground wire unconnected in the ...
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1answer
53 views

Grounding Rod Requirements (Canada, Ontario)?

Been reading up on grounding requirements in my region, but am rather confused about the 2015 code. Rule 10-700 of the Canadian Electrical Code states that Rod electrodes must consist of at least two ...
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1answer
60 views

Do pipes need to be bonded to GEC within 5 feet of entry?

I received a competitive quote from an electrician to upgrade my home's service. He wanted to know where the water and gas lines entered the house because he said they needed to be bonded to the GEC ...
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5answers
262 views

How to upgrade apartment's power grid to protect my electrical devices

I'm not at all an expert in electrical engineering so I'll try to do my best of explaining my issue. I live in Finland and I own an apartment that was built in the 80's. There has been some ...
2
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1answer
163 views

Should the grounds and neutrals be isolated in this "subpanel"?

I have a main disconnect panel outside by my meter. I've got the two hot legs, a neutral and a ground wire from a ground rod below the meter coming into the panel. The neutral and ground wires are ...
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3answers
92 views

Need help resolving open ground in 3-way switch circuit

I have wired a new circuit in my house that is an outlet controlled by 2 3-way switches. I intend to plug a chain of 4 LED shop lights into the outlet. I have run 14/2 from the panel to the first 3-...
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2answers
54 views

Ground-neutral impedance

In the US electrical system, as I understand it, the ground and neutral wires are connected (bonded?) together at someplace. In the past, the location of the neutral bonding was a matter of local ...
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1answer
91 views

120v from 240v with a transformer

I have 240v over Hot-Hot-Ground which is feeding to a sub-panel for a pool. Sub-panel will have a 30amp 2-pole breaker for the pool pump and a 15amp breaker for the lights. I need 120v for the pool ...
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1answer
131 views

Should my new service panel be bonded?

I am upgrading an obsolete Sylvania panel located inside the house. There's a main panel outside the garage with the main 150 amp breaker. I have a supplied bonding screw with the new panel. ...
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1answer
39 views

Can a 20' section of #4 rebar server as concrete-encased electrode ( UFER ) if it is not attached to the rest of the rebar matrix in an on-grade slab

Let's say we have 9'x25' monolithic concrete slab of 5" thickness with a 12" deep by 12" wide "haunch" footer around the perimeter. At 2-1/2" inches below the surface of ...
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1answer
51 views

Does the ground wire need to be continuous through the termination block?

I need to re-route where the ground wire goes through the exterior wall. From the panel, it is run continuous through a termination block (picture below), through the exterior wall, then out to the ...
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0answers
50 views

Grounding Metal Garage with Subpanel

For the subpanel I am installing in my metal garage (concrete floor), I have sunk an eight foot copper-coated rod next to the outside wall and adjacent to the panel which is on the inside of the ...
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2answers
93 views

Conduit / Best practices for a shared ground between branch circuits in residential?

According to NEC 2014 250.130 : Article 250 - Grounding and Bonding VII. Methods of Equipment Grounding 250.130 Equipment Grounding Conductor Connections. Equipment grounding conductor connections at ...
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1answer
78 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-...
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2answers
134 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 ...
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1answer
88 views

why does my main service electrical panel not have a ground? or is it bonded already?

So im in the middle of installing a mini split in my home and i was about to start the wiring but when i opened up my main panel i realized that i dont have any grounds anywhere.So i started doing my ...
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1answer
105 views

Direct Burial Wire for 200 Amp Sub Panel from 200 Amp Main

I'm trying to get the right info to price out my project. I plan to install a 200 amp sub-panel in a shed with a 125 to 150 amp feeder breaker. The shed is about 180 feet away from the main panel. The ...
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1answer
55 views

Neutral-Ground bonding with generator (no utility power)

I've been doing plenty of searching around the internet, but cannot find anything for my specific scenario. Any help or advice would be greatly appreciated. I would like to install a breaker panel at ...
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3answers
768 views

Is my main panel improperly bonded?

My house was built in 1975 and I pretty obviously have a "Rule of 6" GE main panel (the meter is above this) My father-in-law (who has taught me a great many DIY things) swears that the ...
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2answers
83 views

What is the correct safe way to wire ground in a domestic 110/220 step transformer?

I am not an electrical engineer and do not have a deep understanding of all the different factors in transformer design. My question is about a plug-in 2:1 step up/down transformer used for 120/240 ...
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1answer
411 views

Are generator "bonding plugs" safe and legal?

I've been researching portable generators, and I have learned that models with a floating neutral need to be grounded. Some people say you can bypass this requirement by plugging a "bonding plug&...
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2answers
66 views

Unused red for ground in existing armored cable?

My house has a lot of older armored cable using the armor for ground. If I'm working in a box and find a three-conductor wire with only black/white in use, and I know where the other end is, should I ...
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1answer
87 views

Is this grounding configuration correct?

While doing work in my breaker panels I noticed the following: 300A service enters into a large box on the right where it is split to a 200A and a 100A panel. Neutral and ground are bonded in the ...
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1answer
82 views

Can I bond my ground to my gas pipes?

Do I have to install the grounding electrode all the way to the service section, or can I bond the gas pipe to building steel which is continuous through out bldg and then bond the steel to the ...
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2answers
607 views

Sub panel install issue

I had a sub panel installed recently. The plan was that i will be installing my own breakers. The sub is running off of the main about 25 feet away in my garage. I understand that the ground and ...
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2answers
107 views

Bonding new communications system to home grounding system

This will be handled by an electrician, but I wanted to get info on what's permissible as my first stab at talking to an electrician led to a conclusion that seems disallowed and unsafe (entirely ...
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1answer
76 views

Wires from meter to disconnect to junction to home [duplicate]

Maybe I am not explaining what I have here There are 3/4 AWG WIRES leaving the meter and Running to a 100A disconnect with a neutral bar no grounding wires in the box just 2 hot and 1 for the neutral ...
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3answers
100 views

Grounded Neutral Voltage Fluctuatons

BACKGROUND: Hi this is in Chicago so we use EMT Conduit as our grounding system and only use an EGC for stoves/dryers/sump pump/ etc... so I was working with my cousin to demo stuff in a basement in a ...
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1answer
71 views

Sharing a Ground Conductor Between Multiple Circuits

I'm thinking about running circuits for lights and an infrared heater to a patio. The heater is a 6000 W unit with two individually controlled tubes – I'm thinking this will start off in 12/2/2 NM-B ...
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2answers
97 views

Subpanel breaker sizing in detached shed with electrical feed from breaker in main house panel

I want to feed 240V 30A from a new 30A breaker in my home main electric panel to a new subpanel in a adetached shed. The electric feed I want to use for the new subpanel is (4) 10awg THWN wires (R/B/...
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1answer
96 views

How to ground solar transfer switch

I am installing an off-grid solar system to power some external buildings, but I want an automatic transfer switch so that outlets will be grid powered when the solar batteries are low. Can I run a ...
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2answers
222 views

Can I use an existing Ground Rod for Sub-Panel in Detached Garage (Meter box is using the rod currently)

Two buildings: Home and Detached Garage (circa '04 US). Service comes in through a Meter on the Garage to a PVC conduit into the Main box in the home (Single phase 240V with Neutral). In the main box ...
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74 views

How should I handle grounding & neutral bonding when replacing my sub-panel?

Current subpanel was installed in the early 70s. We think we need to replace it as lights are not working (very dim, flickering/fading in/out) - we suspect an open neutral. How do we wire in a new ...
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3answers
223 views

How to compliantly bond galvanized water pipes if the water heater isn't an option

In a previous electrical inspection, I was told to add a 4 AWG CU bonding wire from the main panel to the hot and cold pipes on my water heater. I'm in the process of replacing my water heater with a ...
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1answer
816 views

Why would I have i lost one leg on 240 after maintenance guy changed 100 amp disconnect at the meter

I was having trouble with my lights flickering, then the power went out totally. I checked the main breaker inside, and it was not tripped so I went out to the disconnect at the meter and found that ...
2
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1answer
370 views

How to find a neutral to ground short on my main panel

I've just installed a subpanel in my attached garage. The rough in has passed inspection, however my main panel has standard breakers and has never had fault finding interrupter breakers in it, and ...
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1answer
113 views

Bare neutral to subpanel in detached garage

I have an old house with a detached garage. There is power to the detached garage through a 3-conductor cable that is routed above ground. Power from my house comes from the power pole, to my house. ...
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0answers
45 views

Momentary 'brown-out' when a motor kicks on

As a home owner, I have an ongoing issue which is that everytime any motor kicks on (refrigerator, AC condenser, sabre saw, etc.) the lights dim for a second or two. The main service is at the ...
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2answers
118 views

Can I bond gas plumbing via gas water heater's electrical connection ground?

Locale: WA State, U.S. Inspector approved gas plumbing and followed up later, saying: "Please note that we will be verifying the bonding of the new gas piping at the next inspection, please ...
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1answer
2k views

Grounding tv antenna in attic?

I know this question has been raised all over the internet, with a variety of responses, but here is my specific situation: I purchased this antenna and plan to mount it in my attic. I have an indoor ...
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2answers
247 views

Can I run a new circuit in the same conduit as ground cable?

I had a 100 A sub-panel installed in my garage. The electrician used an LB and conduit stub to bring the ground cable outside into the ground -- the cable is 4 AWG, stranded, in 1/2" schedule 80 ...
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2answers
637 views

Replacing subpanel that was fed with 3 wires

A contractor replaced my subpanel with a new one, and will come back for other work and inspection. (Old subpanel is Federal Pacific.) My home is in California, built in early 1980s. The subpanel is ...
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2answers
180 views

Mixed conduit grounding code

I'm running a few outlets to my basement from the main panel on the first floor. Since it is a garage, sealed 3/4" pvc conduit runs through the concrete into the basement. This connects to a ...
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1answer
313 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 ...
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1answer
160 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 ...
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2answers
86 views

Voltage between breaker box and earth

I recently bought an older (1920) house. The wiring was upgraded ~20 years ago. The breaker box is on the back porch. Circuits run though conduit to the floor of the porch, however the conduit ...
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3answers
149 views

Ground neutral bond screw on a PON main panel

I'm installing a Plug-On-Neutral (PON) main panel. There is a screw with a label indicating that if I need to bond the ground to neutral, tighten to 40lbs. Now I know main panels generally have the ...