100 Days of Article 100: Bonded, bonding, main bonding jumper, system bonding jumper, etc.
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- Опубликовано: 25 июл 2021
- The 2020 NEC definitions of bonded/bonding, main bonding jumper, system bonding jumper, equipment bonding jumper, and supply-side bonding jumper are covered.
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![Grounding, System and Equipment [250.4, 2020 NEC]](/img/1.gif)
Thanks for putting this series together. Many times, I find that people, myself included, struggle with portions of the code because they simply don't know or understand the equipment or systems that the code addresses. These RUclips clips bring the definitions to life and gives a better understanding of the terms used by the NEC.
In my 50 years as a sparky only ran power twice for above ground pools for friends at no charge due to liability concerns. I always considered wiring an inground pool with all the bonding & grounding a speciality like some medical professions. I had no problems troubleshooting production equipment & drives and installing services up to 800 amps but always had a full work load so stayed away from all pools and alarms. A few years ago while attending an IAEI CEU the teacher/inspector warned us that normal insurance policies in our area do not cover installing or maintaing alarm systems. Have to pay thru the nose for a policy covering just that. Thanks for all the great easy to understand vids.
Dude, you are crazy good at presenting this material! Thanks.
Thanks Jim!
You are a great teacher of this. Have learned so much by this series...Nugget picked up today: Supply-side bonding jumper ALSO describes green wire between the source of a separately derived system and its 1st disconnect!
I'm in the trade over 50 years always love reviewing. Remember things change
Thanks again for another wonderful presentation. You explain content perfectly.
Loving this series Ryan. Article 100 is so important.
This truly has been the best video and explanation on the subject!
Thanks.
Very well put and a great way to think about it. Thanks again Ryan!
Excellent explanation Ryan. Enjoying reading Electrical and Systems Training Series. Thanks!
Thanks for the in-depth explanations
Very good summary and explanation of terms and parts of the installation that are usually not so easy to recognize. Thanks Ryan. Awesome.
Thank you so much.
Great video. Pictures and definitions. Helped out a lot in better understanding why we do it those ways
Thank you very much for the information, definitely new subscriber,
Fantastic video Ryan!!!! I have been looking for quite some time for a clear explanation as to why the grounding conductor between the separately derived system and the first disconnecting means is defined as a SSBJ and not an EGC. Great job and thank you!
Amazing explanation thank you
Nicely done!
Great video!
Excellent material, Ryan!
Just wanted to point out that you misspoke in 5:50. You pointed out to having some FMC in the picture you showed. I think you should have said liquid tight FMC. It seems to be liquid tight FMC. Furthermore, for an FMC jacket to be considered EGC, the OCPD should be less or equal than 20 A together with a few more conditions while for a liquid tight FMC, the OCPD can be up to 60 A plus a bunch of other conditions.
Thanks for sharing your experience!
Well done thank you 🙏
Very good
Thank you God bless you.
Question - I work at a water district and we are re-building a pump station. The meter pedestal, free-standing disconnect switch, and permanent generator are all on different concrete pads. There is a new rebar reinforced concrete driveway with handholes in it, too. Should the rebar in the concrete pads and in the driveway be bonded together and bonded to the ground grid? Some websites mention the concern of rebar corrosion due to the copper ground grid. Thank you. Your videos have taught me so much!
At 3:30 those 90's are also available in schedule 80 PVC so there would be no need for using rigid metal 90's.
Thatnks for the video. When do we have to use ground / bond bushing? Is it only at service and concentric knock outs. I usually use them in transformers. But I would like to have a better understanding, best practice. Thanks.
It used to be any metal located within 10' of a pool ie. Wrought iron fences, handrails etc. needed a bonding wire if that fence had a break via a gate both sides needed to be bonded...
680.26 still has similar requirements.
Hey Ryan, I was curious if a conductor could be a supply side bonding jumper and a system bonding jumper at the same time?
Thanks for the video. Would you focus more on how we bond instead of why we bond.
Ryan I'm just a 22 yr old trying my best to get my Journeyman sometime shortly. I have a ? Its more of a theory ?. If you have a Multiwire branch circuit with 2 pole 20A. If you have 10 amps on 1 leg and 5 on the other. Having a unbalanced load of 5 amps of return current on your Neutral. If your main bonding jumper connects your enclosure to the Neutral. Does your enclosure itself have a load of 5 amps or does it go back to source or your GEC? God Bless you and your Family! I appreciate all your videos!
The enclosure has current, yes. But, the conductive objects are all bonded together, so you don't get shocked by touching it.
So it already being intentionally bonded, even you becoming grounded it wouldn't shock you. I think I understand i do appreciate you always responding 👍
@@buckhunter4413 Correct, because if it is properly bonded there will be no potential between you and those metal parts.
Which table do I use to size system bounding jumper.. need some help with that... thanks
(A subscriber) Confusion:
When I use a (bonded portable generator) as backup power to a properly installed transfer switch via L14-30 Connection I believe I complied with bonding code and safety requirements. However what happens if I have an older generator where the neutral is not bonded?
Fair question. The answer is, nothing interesting. That's because a generator that doesn't have a bonded neutral will always be an ungrounded system, even if you drove a ground rod for it.
Thanks
The trend here in Canada is to stop putting ground electrodes into separate buildings that are fed from a main panel elsewhere. For example this week I was asked by an inspector to remove my ground electrode connection for a greenhouse fed by a new four wire service from a home. This would be a good topic one day for discussion, since there are a balance of competing interests and risks. Is it accurate to say that a new subpanel in a separate building fed by an EGC from the main panel should not have a ground electrode? What about lightning protection, and protection of animals in a barn? If I look to older advice, this recommendation has taken a 180 degree turn....
The NEC definitely requires it [250.32(A)], and the NEC never requires a grounding electrode to be removed. I don't see how the grounding electrode would help the animals in the barn, but you are right about the lighting issue. In my opinion, you want an electrode(s) at every building supplied with electricity to help deal with lightning-induced energy.
@@RyanJacksonElectrical I understood his point that the new ground electrode is not tied together in the ground with the main building ground electrode forty feet way, even though by the letter of our code this is a separate building so I thought it would be an exception (10-104). I guess it is to suppress eddy currents, and stray currents from other homes. To my surprise, when I proposed a compromise of cutting off the electrode connection to the EGC and leaving the lightning connection of building to electrode intact, he wouldn't bite. He insisted that the new electrode ground be cut off right at concrete level, leaving the building unconnected to ground electrode. He said that if I wanted I could bond the EGC to the building, but did not require it (building is anodized aluminum so connections would be tenuous anyway).
@@spelunkerd Sounds like your inspector left your building flapping in the proverbial electrical winds with no well structured way to bleed off induced currents or static potential differences from the structure to the earth. Hopefully there are paths that don't cause high potential rises before arcing and that don't arc through something easily ignited.
Ground seems like a simple concept but it serves quite a few purposes and if you focus on one without considering the others, you sometimes create risks.
👍🏻
Can never find out what the proper size bonding conductor should be used when say a 250 MCM copper ground is tetminated in a large switchgear room to a 1/4" thick 4" wide 2 to 4' copper plate. Some places they only use a #10 bondind wire from grounding bushing on the conduit to copper ground buss barr. Ither places they use #2 copper. A large contracter installed at least 50 transformers without installing a ground from metal conduit that ran say 12' from steel beam to carry ground wire. Made them come back and install a grounding bushing on one end of these conduits then a wire from bushing to steel beam. They tried cutting corners by using PVC conduit for transformer ground wire but in our large city use of PVC not allowed due to dangetous fumes genetated when they catch fire.
4:20 What kind of fitting for the bonding is there?
And we bond neutral/gnd bars in sub pnls @ existing separate buildings w/no egc's and no metallic paths ??
Correct.
Hi Ryan, would a ground screw be considered a bonding jumper?
Yeah the green screw by the neutral in panels are the bonding jumper if you use them
@@Paperchaserr-ry3oh I'm more asking about your typical ground screw in a metal box
I have a question. How do i properly bond a few 1/2" AC cable (not MC cable) connecting to a subpanel cabinet? There is no EGC in the cables.
It is bonded through the connector, just like EMT.
@@RyanJacksonElectrical thank you!
6:10 please share where it’s stated .
Emt conduit is only good up 60 amps for grounding. Purpose.
EMT can be used regardless of the circuit rating. FMC and LFMC have limitiations, including the rating of the circuit. See 250.118.
What's the point of taping the sbj with white tape?
can you explain csst flex gas tubing bonding
My head hurts 😭😭😭
you keep saying 'same voltage'.
do you mean same potential?
because there is no voltage.
Great job!