Questions tagged [grounding-and-bonding]
For questions dealing with grounding and bonding of electrical installations, and the specific requirements of such.
166
questions
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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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votes
1answer
70 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
...
0
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3answers
78 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 ...
0
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1answer
39 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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vote
2answers
52 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/...
2
votes
1answer
56 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 ...
2
votes
2answers
68 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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0answers
64 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
98 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 ...
1
vote
1answer
140 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
votes
1answer
145 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 ...
0
votes
1answer
58 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. ...
0
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0answers
43 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 ...
1
vote
2answers
59 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 ...
5
votes
1answer
733 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 ...
1
vote
2answers
67 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 ...
5
votes
2answers
510 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 ...
3
votes
2answers
153 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 ...
1
vote
1answer
74 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
1answer
73 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 ...
0
votes
2answers
83 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 ...
0
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3answers
67 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 ...
0
votes
1answer
44 views
How do you accomplish equipotential bonding for an above ground polyester/PVC pool if the filter pump provided is not compatible?
I recently bought a Bestway 15' x 48" above ground "flexible assembly" pool with polyester-type material and PVC-type vertical frame. In Florida,a permit is required for all pools with ...
0
votes
1answer
109 views
Can I reuse the aluminum feeder wire when I replace a sub-panel?
I'm rewiring my 1957 house because there was no ground. I have a main panel and a subpanel in the crawlspace that currently only give power to the gas furnace. I want to add the air conditioner on the ...
0
votes
2answers
50 views
Sub Panel Grounding method
I encountered a condition where a sub panel' s Neutral wirings are on both Neutral bar and Grounding bar, at a 1960' s home, with wirings are Romex and flex conduits. Subject sub panel served as the ...
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1answer
104 views
Grounding for sub panel breaker
We have an old cabin with 4 fuses in the main 60 amp panel, and a sub panel with a handful of breakers. The sub panel is fed by 3 wires instead of the modern 4. The 4 fuses are all wired with 2 wire ...
0
votes
2answers
164 views
Grounding 3 wires to electrical box with 2 ground screws
I've installed a metal electrical box. There are 3 cables coming into the box. The standard box only has 2 ground screws. My inspector said I am supposed to have 1 single ground per screw...
So, how ...
0
votes
2answers
117 views
Is it safe to split a NEMA 10-50 receptacle?
Is it safe to split a NEMA 10-50 receptacle to a range to add a pair of 5-15 GFCI receptacles?
Unfortunately, I am currently renting, and the homeowner refuses to allow any work to be done. I have ...
0
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0answers
64 views
Repair for water damage from shower tile in plaster wall
This is my first post and first DIY Repair project. This shower is about 12 years old. At first I noticed a column of increasingly bulging 4-5 tiles near the door of my shower. The other side of the ...
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1answer
277 views
Electrical Bonding of Service Panel After PEX Replacement of Galvanized Pipes
My house was built in 1929 and has gone through many rounds of plumbing/electrical upgrades over the years. I am replacing the galvanized pipes with PEX and I'm confident that I have planned ...
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2answers
73 views
Is the ground resistance meter indispensable when grounding your home?
I'm Brazilian and I need to ground my house, especially because of some expensive equipment I don't want to use without proper protection.
By "grounding my house" I mean: provide an alternative path ...
10
votes
3answers
1k views
Are the grounds and neutrals in this electrical subpanel reversed?
I would appreciate your feed back to help me understand the logic behind Bonding the Neutral and Isolating Ground as shown in the attached pics. Subject sub panel is dedicated to one of four ...
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vote
2answers
33 views
Have four-conductor feed at detached garage subpanel, how to verify the ground?
I'm currently rewiring my new-to-me detached garage. Garage is from the 70's but has a newer Siemens panel (previous owners added a hot tub). The feed from my service panel is a sheathed 4 conductor ...
0
votes
1answer
82 views
Setting up transformer for 240 down to 120
I'm using 240 for voltage drop. The load is a receptacle fed from a subpanel. I know the size of the transformer,the fusing I want to use but, need help figuring out how to ground the system. In ...
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vote
2answers
234 views
Intersystem bonding terminal - how direct?
Back before I knew what an intersystem bonding terminal (IBT) was properly called, I had my service entrance put in by an electrician, licensed in 3 states, who never-the-less pulled things I now know ...
0
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1answer
56 views
Ecuador grounding an ungrounded house
Hi so I’m an electrical engineer visiting some family in Ecuador and after some wiring has stopped working In the kitchen I have decided to rip out the 40 plus year old installation and reinstall. ...
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2answers
752 views
How should a sub panel be grounded if next to the main breaker?
How should a sub-panel be grounded if next to the main breaker? Do the ground and neutral need to be isolated (separated) from each other in the sub? Sub-panel will be about 6 - 8 feet away from the ...
3
votes
1answer
165 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 ...
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vote
3answers
158 views
Grounding TV Antenna and Metal Porch, And Resolving Ground Rod Issues
I'm mounting a light-weight metal TV antenna to a metal mast attached to old-school metal roof columns (with the curly-cues) on a small second floor porch which has a metal porch roof, and metal floor ...
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 ...
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vote
4answers
151 views
Can you have neutrals on ground bar only bonded through main panel body
I have just added a circuit to my main panel and saw something I wanted clarification on. For reference, my main panel is a Homeline 30 space panel with 2 extra grounding bars on the sides. Picture ...
2
votes
1answer
180 views
Are my circuits properly grounded?
I have a Cutler Hammer CH30e panel. On the right side on the panel there is a neutral bus with the a #6 cu ground and a 1/0 Al THW neutral. The bus is also connected to the panel
What I find very ...
2
votes
2answers
175 views
Bonding CSST to electrical ground system
I had a licensed natural gas tech/plumber install a new branch line using CSST to a new fireplace. When I am asked him about bonding it, he said he had never heard of that before. From everything ...
0
votes
1answer
38 views
Drawbacks of Bonding Earth & neutral in Industrial sub panels
Bonding of Earth and neutral in machine subpanels will causes problem, but I want to know how it would affect PLC & VFD, etc.
The machine has 2 panels one for heaters (uneven load in each phase) ...
0
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1answer
61 views
Floating Ground in Renovated Bathroom
I am a homeowner and retired RF Engineer, not an electrician. We bought a house built in 1955 that we have been remodeling in stages over the past five years. The first thing I had done was to ...
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1answer
87 views
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3answers
2k views
2 load centers under 1 meter: do you need bonding and main breakers at both?
Here's my layout as it stands:
meter
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200A disconnect, neutral and ground bonded
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mobile home main panel (200A main breaker, neutral and ground not bonded)
I would like to run another 100A ...
0
votes
2answers
180 views
Can a grounding conductor from equipment terminate in a metal box grounded via EMT?
I have EMT leading to a metal junction box, and from that box goes plastic liquid tight to some equipment. Currently I have a ground conductor running all the way back to the panel, but I'm wondering ...
12
votes
3answers
4k views
Can ground attached to neutral fool a receptacle tester?
I'm using a basic outlet tester like the one from picture below. Let's say someone wired the ground to the neutral in some outlet, to provide a fake ground. What would the tester report? Would it be "...
0
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0answers
42 views
Detached garage with a 3-wire feeder
This house is being sold, a home inspection has noted that the neutral and branch circuit ground wires are landed on the same bar in the sub panel at the detached garage,it is feed with 3 wires from ...
