Questions tagged [grounding-and-bonding]
For questions dealing with grounding and bonding of electrical installations, and the specific requirements of such.
294 questions
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External TV antenna grounded inside attic?
I want to install an OTA external antenna to an existing satellite dish mast, I have removed the dish and plan on just attaching the antenna. The existing dish mast was never grounded, there are also ...
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Does the ground wire for my pool connect to the pumps?
I am in the midst of a new gunite in-ground pool install. I have the electrical background to tackle this job but I want to know I have it right, particularly around the bonding and grounding. I got ...
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Intersystem grounding bus ran out of terminals; now what?
My intersystem grounding terminal bus is out of available terminals, and I have two additional communication wires to ground to it. Does NEC allow supplementary bus bars? NEC 250.94 seems to imply no, ...
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Can I run just one wire to the sub-panel via schedule 40 separate from the others?
I have a 25 year old recalled sub panel, three wire, converting to new Eaton 100A. Want to add a wire to meet code
Is it allowed by code to run just one wire to the sub panel via schedule 40 to the ...
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Should I bond neutral to ground in a three-wire service when adding new branch circuits?
I'm adding 2x20 Amp circuits to a main panel outside, but the main has 3 wire system. Also the main has 6 spaces for circuits, which allows me to add this circuits. The problem is the 3 wire system.
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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?
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200amps service - ground rods instead of pipe connection
I upgraded my main circuit breaker today from 150amps to 200amps.
See my previous posts here on the same project:
Is RC2040M150CH MSP upgradable to 200amps main circuit breaker
Neutral on main ...
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How can I connect a new ground rod?
Illinois house, built 1963. Not sure if there is a ground rod or just the water pipes used for ground. Want to put in another/first rod. Can I connect it to the clamp on the electrical meter housing ...
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Adding sub panel, odd main panel configuration
I am in the process of adding a sub panel to a detached garage and I have the proper gauge wire connected up to the sub panel (neutral and ground NOT bonded) with 3 conductors + ground running in ...
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3 Phase Grounding
My warehouse is in an industrial complex. Our building has 6 units for 6 unique tenants. There is one meter room where all the meters are located as well as a 1600 amp main disconnect. Service comes ...
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How to connect grounding wire to gas pipe for 2017 NEC 250.104(B)
I'm trying to interpret and apply the 2017 NEC bonding requirements from 250.104(B) to my existing home gas line. I've read this related question to determine I should use #6 AWG wire, but I'm unsure ...
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How to run 10 AWG ground wire along basement wall?
What would be a sturdy and efficient way to mount a single 10 AWG solid core ground wire along an unfinished concrete basement wall (connectors, fasteners, etc)? I'm connecting a server rack ground ...
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Adding ground to replacement sub panel
We recently purchased a new home that has a 16 x 30 steel building in the back yard approximately 100ft from the main panel. The building has power run to it off a 60 amp breaker in the main panel. ...
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Can the Distance of a Subpanel affect Outlet Tester Results
I got help with wiring my cabin here:
Requesting Evaluation of Power Plan at Rural Cabin
and here: Cabin Wiring Plan Revisited
I also put a follow up comment there, but now I'm not sure that was the ...
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Power Panel Grounding and Neutral Bonding / Dryer hookup in an older home [1975]
In my home I have the old 3 wire Dryer and Range connections.
Looking at my CB service panel; my neutrals (white) and my ground wires (bare copper) connect to the same bus bar. Main service panel - ...
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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 ...
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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 ...
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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 '...
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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 ...
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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 ...
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Do I need to install another Bonding bus bar in the disconnect?
In Texas (CenterPoint Energy) from the meter can to the disconnect, I have three wires, HOT, HOT and Neutral. In the disconnect I need to connect the Neutral to the ground however the Neutral bus ...
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Voltage In Shower
I have been trying to get this issue fixed for the better part of a year now. I have had three electricians take a stab at this, and none of them were able to figure anything out.
The primary shower ...
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Should I connect one or both Ufer grounds to my panel?
Local code requires the use of a Ufer ground (concrete-encased electrode) as a ground rod system for new construction. There are two electrodes in my construction. My question is: do I connect both ...
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Pool bonding, retaining wall in the way
I currently have an 24ft intex Pool. I know it doesn't have to be bonded but while the yard is torn up I am thinking it may be a good idea to run the bond wire now for when I upgrade the pool to a ...
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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 ...
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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 ...
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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 ...
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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 ...
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Does the NEC permit brazing for connections to ground electrodes?
I need to connect several copper-clad ground rods together with AWG 6 solid copper wire for lightning protection, and as part of the electrical service grounding. I also need to connect some 2.5" ...
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N-G Bonding Jumper problem
I found out that my meter base has an N-G Bonding Jumper but also there is one in my service equipment main panel and also another one in the service panel for all the backyard lighting and equipment ...
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Does Intex pool need to be bonded?
I'm installing a 24 foot by 52 inch Intex pool. I read that pools over 42 inches deep need to be bonded. Also people are saying because of that Intex pools need to be bonded.
Two things,
the original ...
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Sub Pabel Install, NEC 250.24 question, Mixed ground/neutral at main
Did this install today on my home. How'd I do?
I asked an old electrician and he said that I ought not to mix the Neutral with the Ground at the main like that cause "it could cause problems", ...
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Can ground wire be downsized mid run?
I'm planning on running some schedule 80 PVC conduit in my garage to add extra outlets. At the same time I want to ground the 2 post rack I have in my garage. A few related questions that appear ...
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Do I need to separately bond sections of copper pipe connected by push-to-connect fittings?
If I have two sections of copper pipe (water or gas) connected by a push-to-connect fitting (e.g. Shark Bite brand's push-to-connect pipe fittings), is electrical continuity preserved, or do I need to ...
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Electrical service grounding
I have a 600 amp electric service. The POCO wiring comes to a 600 amp meter, and then there are three 200 amp main disconnects that feed 3 200 amp breaker panels. The meter box and main disconnects ...
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Should I avoid ground loops in branch circuits through conduit?
I've got some outdoor conduit within which are three separate branch circuits:
A general purpose, 20A outdoor receptacle circuit
A 15A HVAC circuit
A 40A EVSE circuit
I am using NM-B for each ...
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What did cable installer use to tap onto my service ground?
I have a somewhat mysterious service ground apparently underneath a concrete entryway. All that is visible now is a heavy gauge bare copper wire coming through the cement. When the cable company ...
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Adding second ground rod. Is this an acceptable way of bonding?
I recently found out that our sole ground rod is only 4 feet long. That said, I want to add a properly-sized ground rod to "improve" the grounding system and hopefully comply properly with the ...
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Grounding 200A Main Panel with Changes to Water & Gas
Going through an extensive DIY remodel of a "total electric" 60's town-home in Texas.
EXISTING is 200A main panel with neutral bonded to ground consisting of #6 bare solid Cu to cold feed Cu pipe on ...
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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 ...
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Chinese Breaker Box (240v split-phase?) Lacks Neutral Wires and Grounding Bus
I recently spent Chinese New Year at my girlfriend's apartment (in China) and woke up one morning to find we'd lost power. I opened the breaker box in the apartment to find the main breaker (2P 40A) ...
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What is necessary to make my old 3-wire 30-A dryer connection compliant with current code?
I have a 3-wire connection for the clothes dryer, and I would like to make it compliant with current code the simplest way consistent with reasonable safety. I haven't looked at the connection block ...
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What size equipment grounding conductor is needed for this gate lights circuit?
We live in a rural area and I am running a circuit to to our gate for a couple of post lights and maybe a receptacle. The run is 485 feet from the closest panel. I am installing THHN wire in a 1" ...
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How to handle unattached ground wires in boiler fusebox/control panel (sub-panel?)?
I don't have enough of an understanding of HVAC to know if the pictured boiler fuse box is considered a control panel or a sub-panel - but some wiring issues there lead me to needing to understand ...
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Receving 120 and 220 volt readings when testing a home outlet
I recently redid a room in my house (older home built in the 60's i believe). I decided to replace the outlets as well as they where loose and wouldn't hold plugs very well. When i pulled a few of the ...
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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 ...
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How Do I Bond My Antenna to Home Electrical Ground?
I'm about to install an Over The Air (OTA) antenna as the first phase of cutting the cord.
I understand the antenna and coax cable need to be grounded. I can purchase and drive a grounding rod where ...
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How does a water meter affect the continuity of a grounding electrode system when a jumper is present?
250.53(D)(1) Continuity. Continuity of the grounding path or the
bonding connection to interior piping shall not rely on water
meters or filtering devices and similar equipment.
250.68(C) ...
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Existing 3 wire service feed to sub panel: bonding grounded neutral and ground bars?
I know variations of this question have been asked (the closest I could find is here), but I'm still confused.
@Tester101 explained if the existing feed to the subpanel is 3 wire with a grounded ...
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How to add a surge protector on 240 circuit at pool sub panel - neutral or ground connection?
Trying to add a surge protector at a sub panel by pool. The 240 circuit runs from the main load panel on side of house to sub panel by pool - red, black and green only - to a disconnect and the pump. ...
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