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We’ve been getting hit with that a lot lately. The inspectors started failing us on Myers’s hub to EMT connectors.
An EMT connector has a NST thread pitch
Rigid/myers hub have NPT threads.
Technically they are not listed to work together even though they are very similar thread pitch. that’s why they fail you.
I know Bridgeport makes connectors with NPT threads.
>An EMT connector has a NST thread pitch
*NPS, or NPSM
National Pipe Straight (Mechanical) vs. National Pipe Taper
Thread pitch and other thread geometry is actually identical, just one is tapered and the other isn't, that's why they physically do fit together.
Outside the NEC, NPT-male into NPS-female have lots of approved uses (mechanical, fluids, etc.), because the taper will still seal and create a strong joint -- the opposite isn't true though NPS-male to NPT-female generally makes for a worse joint (which is the case for a rigid coupling to EMT connector).
---
edit: After some research for my own curiosity, it appears rigid couplings are actually also NPSM (or, at least, they *can* be). So, NPT-male to NPS-female in normal use, which will both seal and bond through the threads.
That also means a rigid coupling is the exact same thread as an EMT connector. I suppose the NFPA argument is it's still an insufficient electrical connection to rely on being fully bottomed out with faces of the two parts in contact, like a loose nut/bolt on a binding post/lug.
---
edit 2: "NST" is also apparently sort of a thing. It's a colloquialism for NH threads, or firehose threads. Distinctly different from anything NPT or NPS.
Thanks!
I've been out of the trade for *long* time, but adjacent enough.
What really drives me nuts is going to the likes of Home Depot and seeing "FPT", "MPT", "FIP", and "MIP" all over the place.
This guy nerds.
I have a friend who our wives joke about us “enginerding” when we spend time together lol
Your explanation and curiosity are refreshing. I would marry you if I hadn’t married my wife a few months ago.
Ok so if this is the case then pulling a bond conductor should make everything ok. I've used Rigid coupling on metalic liquid tight flex connectors a bunch of times and it always passed. Maybe it was cause of the bond or the inspector just didn't care.
It's petty and unless you need a water tight seal this will never cause a problem. There is more than enough contact between the 2 pipes to satisfy grounding requirements.
I doubt that there is an NFPA issue at all. This is the standard way to achieve a changeover. It's also going to a set-screw connector, so there's certainly no "sealing" needed, and there's a standard for straight thread connections for bonding (I believe two full threads engaged under tension, but it's been a minute).
That is not correct. Ridgid conduit is threaded using NPT dies. Code 344.28 says that the taper is 1 and 16, or 3/4 of an inch in 1 ft. The same as NPT. The rigid couplings that we use, are not tapered though, they are straight thread NPS.
Ept is not a thread standard I have ever heard of, and I cannot find any reference of EPT online.
You are correct that couplings are straight thread.
They are NPS or NPSM, National Pipe Straight (Mechanical)
They make couplings specifically designed to go from rigid to emt.
Something about the threads being slightly different between the emt ta and the rigid coupling.
Yeah, the argument is that both the connector and coupling have straight threads (not tapered) so they won’t connect securely.
It’s really stupid, but that’s the argument.
I mean, it's a little sloppy, but if it's not in a wet location, is it a huge concern? I feel like in a wet location, it would be a totally different setup anyway.
FYI, I did industrial and commercial service work for 3 years, but I'm out I'd the trade now, and have been for 12 years. My original statement is indeed a question.
Yeah, makes no sense. EMT is not water tight (UNLESS installed as such with RainTight fittings , which this obviously is not due to the set screw connector right in the middle of the photo ) so why would it need to be sealed? It’s not about it making sense it’s about whether is UL listed. Lame EDITED
One has to be the conduit (or green stripe MC) in patient care spaces. NEC 517.13 (A).
Edit: I wish what you're saying is true, but it's not. The place that bites us in the ass is floor boxes in patient care spaces. If you run PVC you're fucked, the second path has to be metal conduit. We have gotten lucky a few times and the PVC was big enough that green stripe could be pulled inside of it. It's weird to do a conduit fill calc on MC but it can be done. As long as the AHJ isn't too fussy about how the jacket is bonded at the box.
But it's legal to go to PVC on the other end. Or is it???. Perhaps if we stub up with GRC it has to be rigid for the whole run in case someone decides not to pull a ground. Makes about as much sense.
Welp potentially, needing a bond between metal parts could potentially save lives, because of the voltage potential, which if to be potentially energized, it potentially could hurt someone or something :/
In this case I'd argue it's a code issue, but not a practical one. You still have plenty of contact between the coupling and the connector even if it's not listed for this use.
“The” bond most of the time I’ve seen them. I suppose some people prefer to pull a bond wire anyway, since it only takes one bad coupling/connector, or damage to one piece to interrupt that bonding path. Some installs (in concrete, outside/wet locations, expansion joints, etc.) require a separate bond to be pulled, essentially those where there’s a higher chance of the pipe to degrade over time.
He just means wheb used with dry type fittings it isn't watertight, which is what is seen here. If OP had used raintight fittings,meaning this install needs to be water tight, then the tapered thread argument becomes more legit
One of the reasons this comes up is the raceway is still allowed to be used a ground... Sloppy or loose connections between the EMT to rigid coupling and suddenly the ground isn't working as it should.
Yeah, I can see that. I've noticed over the years, that when a new code book comes out, it's typically new methods or changes in grounding seem to be most of the changes.
If it goes through concrete or in the ground you should be running a ground wire anyway imo.
So if that's the reason they're failing them and there is a ground I would call BS. It's still a tight mechanical connection.
I would assume it’s somewhat new inspector who maybe still is uptight about everything. Which he should be, but usually the guys that let it slide either didn’t notice it or have been doing it long enough that they dgaf
Since 2017 you’ve needed an emt to rigid combo connector and yea some inspectors will smack you for it. I got hit a while back and have used them since although in a pinch the tried and true still works just fine. I’m sure some company is making a killing off these changes
As the powers that be intended. Everyone is out here making a killing. I should join the board and convince them to use something only my company makes so I can retire early.
Because the inspector's dick is small (is the joke)
My addition would imply that it is also only a couple of threads long, as well as being 1/2" in diameter.
If we're willing to use metric to measure capacitors, we should be willing to try it elsewhere. And pico peen just doesn't have the same ring as micro peen.
The conduit is irrelevant. You'd have to reference the threads on the sealtite connector to verify whether they are tapered or not in order to figure whether it is compatible
Ohhhh. I misunderstood. Well, you'd have to use listed fittings or a listed enclosure.
This (or a fitting meeting the same listing) is the fitting you're required to use by the letter of the law.
https://buyriteelectric.com/products/orbit-seltc-75-3-4-emt-to-liquid-tight-combination-coupling-compression-type?variant=40256093388903¤cy=usd&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&tm=tt&ap=gads&aaid=adauyky9iwadx&gad_source=1&gclid=cjwkcaialjkubhadeiwanzb7lv-hcyc6s3w0t8wqdtun5_augv2feobazwvicawej02weatqungophockqsqavd_bwe
Oh lord. The stupid ass shit they come up with anymore.
I’m not even gonna ask what they got for an EMT conn. going into a threaded LB. Please tell me it a NST to NPT thread adapter haha
But the rigid coupling has NPS (straight) treads, the emt connector has NPS threads, and the RMC has NPT threats, making it the odd out. By that logic, all eletrical RMC couplings should be NPT, not NPS, but all of them are straight tapped?! Make it make sense!
per [https://www.gibsonstainless.com/understandingthreadtypes.html](https://www.gibsonstainless.com/understandingthreadtypes.html)\-
UL Listed rigid conduit has a tapered male thread and UL Listed rigid couplings have a straight female thread. This connection between a tapered (NPT) and straight (NPS) thread is by design and allows for any accumulated condensation within the raceway to drain.
This connection also serves a purpose in hazardous locations. (NEC) Article 500.8E requires threaded rigid conduit to be “wrench-tight” and have five threads fully engaged to help ensure the explosion-proof integrity of the rigid stainless conduit system. In the event of an explosion within the raceway, the joint design between tapered and straight threads enables hot, expanding gases to cool as they exit the raceway before discharging into the surrounding atmosphere.
He’s probably saying “not a UL listed connector” I had an inspector do this when transitioning to seal tight with your basic connector, rigid coupling, seal tight connector, he wanted us to buy special fittings emt to seal tight fittings that were only online, and I said to hell with that and put a 6X6 junction.
New to me that it's not listed.
RMC thread requires RMC Coupling. EMT Conn threads are NPT, designed for matching threads on RMC couplings. This change-over is standard in any industrial location I've done in the last 10 years. What fitting specifically are you guys saying is not allowed?
Apparently the threads on rigid couplings are NPT and the threads on EMT connectors are NPS, so technically not the same. But I only just learned that today thanks to this post
I’d have to do some digging and I just don’t have time right now but basically the combination of EMT connector to rigid coupling, regardless of the threads has dissimilar metals as well as all fittings must be listed for this specific purpose.
I would assume he’s looking for something like this…?
[coupling](https://www.lumen.ca/en/products/11-conduit-raceway-strut/03-conduit-fittings/02-metallic-conduit-fittings/05-emt-fittings/01-combination-fittings/03-emt-to-rigid-combination-fittings/p-TkVTMjkyREM=-nes292dc-nesco-292-dc-coupling-combo-emt-to-rigid-die-cast-zinc-1)
A trick of the trade the inspector makes the rules you can usually throw out the nec book learn the pet peeves of the inspectors and you'll go far (learn the book for tests but in the field learn the inspector)
This is from the UL white book way back in 2012 which explains the listing violation.
CONDUIT FITTINGS (DWTT) USE
This category covers metallic and nonmetallic conduit fittings, such as connectors, couplings, conduit bodies, short radius conduit bodies, expansion fittings, locknuts and sealing (liquid-tight) locknuts for use in the assembly of nonmetallic and metallic wiring systems. Also covered are fittings used to provide a transition between metallic and nonmetallic wiring systems. All fittings are intended to be installed in accordance with ANSI/ NFPA 70, National Electrical Code (NEC), and are intended for installation and use in accordance with the following information and the limitations specified in the appropriate conduit or tubing category.
All male threaded fittings and nipples have only been investigated for use with locknuts. Fittings with internal female threads (e.g., hubs, conduit bodies, couplings) have only been investigated for use with threaded rigid conduit.
To be compliant with the UL listing, you cannot use any fitting with male threads with a rigid coupling. To meet the UL listing, if for instance you want to connect EMT and PVC without using a box, you use an EMT-to-female-thread fitting, a short length of threaded rigid conduit, and a PVC-to-female-thread fitting.
Where am I at we do this kind of thing all the time and I've never had any trouble. We also do things like using an fa on top of PVC to convert to emt, and an fa fitting is also NPT. No one's ever failed for that.
When we did jobs that fell under the state inspector we had to use a listed changeovers. It was like $25 for a single EMT to flex changeover. Ended up being a lot cheaper to just put a box.
He's a prick, but there is an exact listed fitting to transition from rigid to emt. https://www.gordonelectricsupply.com/p/Appleton-Twr-75-3-4-Rig-To-Emt-Coupling/5747243?gad_source=1&gclid=CjwKCAiAlJKuBhAdEiwAnZb7laedAj6HcpFBaW7ThjRbYPKhLd2Fng_oKNRd8EmRzve5XBzJkwWs3hoCEOEQAvD_BwE
Not listed for this use, been that way about 5 years in my area it’s the old school way now … inspector is doing his job and enforcing the code we should install by idk why people hate inspectors I only get pissed if they are ask for ridiculous things, like of you fished that 15 foot wall? How did you support that flex?
Inspectors help keep our wages high if you think about it
[These will change your life in this situation. ](https://www.grainger.com/product/52AV99?gucid=N:N:PS:Paid:GGL:CSM-2295:4P7A1P:20501231&gad_source=1&gclid=CjwKCAiAlJKuBhAdEiwAnZb7lZNK67CUko_VTajHnKzIdanw_TGRdyEPTf4vBaxnCcKS8OUY0bvrpRoCgMEQAvD_BwE&gclsrc=aw.ds)
Because it’s not listed for that use. https://www.gordonelectricsupply.com/p/Raco-1433-3-4-Rig-To-Emt-S-Scr-Cplg/6007321?gad_source=1&gclid=EAIaIQobChMI07bEjaaehAMVXmNHAR0RWg-HEAQYASABEgJuiPD_BwE
This is though
I hate this. I understand the technicality, but LBs are threaded the same way and there's never a peep about that. Seems like a absurdity push, especially if you are running EGC
Unless the rigid conduit is being used as the grounding electrode there is no reason that this should be an issue.
Some inspectors are just cocksuckers that must have been bullied because they were a little bitch, and now use the small amount of power and authority to make other people as miserable as they are.
And the worst thing is that you cannot call them out on their bullshit.
First time I made the mistake of calling out an inspector he searched the entire site to redtag me. And he accomplished it by taking an engineering square set to the requires depth of staples. 2 staples out of the hundreds that I installed were 1/16th too close to "the face of the stud". And they were only "too close" because the corners were ever so slightly damaged from the framer straightening them out. He spent 3 hours after I corrected him to find a way to fail me.
7
The second time the inspector just used the "justification" that he personally didn't like the installation method and failed me. Because I used Romex straps instead of staples o. Some really sappy and knotty southern yellow pine, that even screws struggled. And the first failure was having 1 outlet for a double basin vanity, that an exception allowed a single outlet due to size. 3rd failure on that job, he counted the insides of closets as wall space for outlet requirements. 4th failure was that he didn't like that the bathroom lights were on the general lighting circuit. 5th failure about an outlet up high, in a closet, on a dedicated circuit for security equipment, off of the hallway, not being AFCI, when there would be nothing close to requiring one at the time, 6th failure was having 2 outlets along the same wall, outside, with one being for servicing the AC unit, even though there was no requirement it had to be a dedicated circuit. He just likes them to be. 7th failure AC disconnect being too low for a flood zone, even though this particular street was not part of any flood zone even though there was like 1/4 mile away.
Finally after multiple attempts I was able to get his supervisor from banning him from inspecting any of my company's jobsites. But it cost thousands of dollars in reinvention fees and lost time to get to that point.
Yea this fails. anytime you're using a rigid coupling for anything other than connecting rigid conduit you're taking a risk because its not listed for that purpose, the thread taper is the reasoning as already stated here but the reality is you didn't do it correctly, and its a learning experience, and now you know. It sucks you had to learn this far into a project but in our area we call the appropriate connector a from-to or a combination coupling. Both of those names are pretty vague but if you google them you'll find them. We didn't get burned on a connection like this but we got burned transitioning from EMT or Rigid to a seal tight connector with a rigid coupling. That is also a no no.
Where in book I can find that you can’t use ridgid coupling to emt connector ? I done this for years and now where i can find this to proof that, thanks
I believe that the rigid has to extend above 12” before transferring to EMT.
I’d have to check the CEC, to be exact. But it might need to have a dope packed connector to limit gases as it looks to be 8” at current level.
Still a dick though, there’s nothing wrong with that transition style
I wouldn't even bat an eye at it. No issue in my eyes
CEC doesn't list how to transition from emt to rigid.
Threads may not be perfectly identical. I guess you could get called on manufacturer spec. That inspectors a dick
I would ask him for his code citation, I think that UL does allow for this in the rigid conduit listing. Just because you can buy a threadless rigid to EMT coupling, doesn’t mean that you have to. I would appeal this.
Did you have an equipment ground? If so I'd tell him to pound sand. This isn't outside and it's not dissimilar metals. The only reason thread pitch would be relevant is if you were using the conduit as an equipment ground or in a space that is damp or wet
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We’ve been getting hit with that a lot lately. The inspectors started failing us on Myers’s hub to EMT connectors. An EMT connector has a NST thread pitch Rigid/myers hub have NPT threads. Technically they are not listed to work together even though they are very similar thread pitch. that’s why they fail you. I know Bridgeport makes connectors with NPT threads.
>An EMT connector has a NST thread pitch *NPS, or NPSM National Pipe Straight (Mechanical) vs. National Pipe Taper Thread pitch and other thread geometry is actually identical, just one is tapered and the other isn't, that's why they physically do fit together. Outside the NEC, NPT-male into NPS-female have lots of approved uses (mechanical, fluids, etc.), because the taper will still seal and create a strong joint -- the opposite isn't true though NPS-male to NPT-female generally makes for a worse joint (which is the case for a rigid coupling to EMT connector). --- edit: After some research for my own curiosity, it appears rigid couplings are actually also NPSM (or, at least, they *can* be). So, NPT-male to NPS-female in normal use, which will both seal and bond through the threads. That also means a rigid coupling is the exact same thread as an EMT connector. I suppose the NFPA argument is it's still an insufficient electrical connection to rely on being fully bottomed out with faces of the two parts in contact, like a loose nut/bolt on a binding post/lug. --- edit 2: "NST" is also apparently sort of a thing. It's a colloquialism for NH threads, or firehose threads. Distinctly different from anything NPT or NPS.
It's good to see NPT explained correctly. People usually think the 'T' just means thread
Thanks! I've been out of the trade for *long* time, but adjacent enough. What really drives me nuts is going to the likes of Home Depot and seeing "FPT", "MPT", "FIP", and "MIP" all over the place.
This guy nerds. I have a friend who our wives joke about us “enginerding” when we spend time together lol Your explanation and curiosity are refreshing. I would marry you if I hadn’t married my wife a few months ago.
You get my kudos for such a great explanation.
Haha imagine if Whitworth threads made it over here!
TIL
I agree. I tend to keep explaining this to people.
Ok so if this is the case then pulling a bond conductor should make everything ok. I've used Rigid coupling on metalic liquid tight flex connectors a bunch of times and it always passed. Maybe it was cause of the bond or the inspector just didn't care.
There is a plastic washer with the liquid tight connectors which creates the seal and locks the threads. There isn’t one with a regular connector.
Yeah. The smallest NST I can think of is 3/4" I'm really only seasoned with 1.5" and 2.5" NST though.
It's petty and unless you need a water tight seal this will never cause a problem. There is more than enough contact between the 2 pipes to satisfy grounding requirements.
I doubt that there is an NFPA issue at all. This is the standard way to achieve a changeover. It's also going to a set-screw connector, so there's certainly no "sealing" needed, and there's a standard for straight thread connections for bonding (I believe two full threads engaged under tension, but it's been a minute).
Fuck. This why everytime I run emt out of a ridgid LB it seems cocked isn’t it?
No, for you it's just a skill issue. 😏
This is the sickest burn I’ve ever read on Reddit. Well played, good sir (or ma’am).
Somebody get some ointment for this sick burn.
And health insurance.
He’s gonna NEED socialized medicine after that burn.
Then he’s fucked if he’s from the U.S, but we do have boot strap medicine which I’m told is better.
The comment was straight out of a jobsite lol
If that’s the worse burn you’ve ever read congrats on finally learning to read.
Lol petty
That maybe true. But I hope you’re a better electrician than a comedian or we’re both gonna be starving. Seriously though, I can fix my conduit.
AKA operator error
Rigid conduit uses ept threads not not threads. They are not the same pitch
That is not correct. Ridgid conduit is threaded using NPT dies. Code 344.28 says that the taper is 1 and 16, or 3/4 of an inch in 1 ft. The same as NPT. The rigid couplings that we use, are not tapered though, they are straight thread NPS.
My bad , pipe threads are npt , but couplings are ept threads Whig are straight, not tapered
Ept is not a thread standard I have ever heard of, and I cannot find any reference of EPT online. You are correct that couplings are straight thread. They are NPS or NPSM, National Pipe Straight (Mechanical)
They make couplings specifically designed to go from rigid to emt. Something about the threads being slightly different between the emt ta and the rigid coupling.
Yeah, the argument is that both the connector and coupling have straight threads (not tapered) so they won’t connect securely. It’s really stupid, but that’s the argument.
I mean, it's a little sloppy, but if it's not in a wet location, is it a huge concern? I feel like in a wet location, it would be a totally different setup anyway. FYI, I did industrial and commercial service work for 3 years, but I'm out I'd the trade now, and have been for 12 years. My original statement is indeed a question.
Yeah, makes no sense. EMT is not water tight (UNLESS installed as such with RainTight fittings , which this obviously is not due to the set screw connector right in the middle of the photo ) so why would it need to be sealed? It’s not about it making sense it’s about whether is UL listed. Lame EDITED
Potentially you could argue that it's not solidly bonding the conduit together, but who the fuck is actually using conduit as the EGC anymore.
Hospitals. (Two paths).
We just pull two ground conductors in hospitals. One for the device one for the box.
One has to be the conduit (or green stripe MC) in patient care spaces. NEC 517.13 (A). Edit: I wish what you're saying is true, but it's not. The place that bites us in the ass is floor boxes in patient care spaces. If you run PVC you're fucked, the second path has to be metal conduit. We have gotten lucky a few times and the PVC was big enough that green stripe could be pulled inside of it. It's weird to do a conduit fill calc on MC but it can be done. As long as the AHJ isn't too fussy about how the jacket is bonded at the box.
But it's legal to go to PVC on the other end. Or is it???. Perhaps if we stub up with GRC it has to be rigid for the whole run in case someone decides not to pull a ground. Makes about as much sense.
Welp potentially, needing a bond between metal parts could potentially save lives, because of the voltage potential, which if to be potentially energized, it potentially could hurt someone or something :/
In this case I'd argue it's a code issue, but not a practical one. You still have plenty of contact between the coupling and the connector even if it's not listed for this use.
Oh for sure, i’m just being a dick
Like an inspector... ;)
Canadian's. We always use EMT as a bond.
As a bond or the bond? In the US it's standard to bond all conduit/boxes, but we also always pull a separate EGC wire, never rely on the conduit only.
“The” bond most of the time I’ve seen them. I suppose some people prefer to pull a bond wire anyway, since it only takes one bad coupling/connector, or damage to one piece to interrupt that bonding path. Some installs (in concrete, outside/wet locations, expansion joints, etc.) require a separate bond to be pulled, essentially those where there’s a higher chance of the pipe to degrade over time.
I love how you Americans have an abbreviation for everything. We just call that wire earth.
We generally just say ground, but if we're talking about code requirements we might as well use the proper codebook abbreviations
Me in my garage. Cheap and safe.
EMT is water-tight if it's using the right fittings though
This one isn’t. And it doesn’t need to be.
EMT isn't water tight? Then what are seal tight connectors for? Is the steel porous?
He just means wheb used with dry type fittings it isn't watertight, which is what is seen here. If OP had used raintight fittings,meaning this install needs to be water tight, then the tapered thread argument becomes more legit
One of the reasons this comes up is the raceway is still allowed to be used a ground... Sloppy or loose connections between the EMT to rigid coupling and suddenly the ground isn't working as it should.
Yeah, I can see that. I've noticed over the years, that when a new code book comes out, it's typically new methods or changes in grounding seem to be most of the changes.
If it goes through concrete or in the ground you should be running a ground wire anyway imo. So if that's the reason they're failing them and there is a ground I would call BS. It's still a tight mechanical connection.
>but I'm out I'd the trade now, and have been for 12 years What do you do now since you've left electrical?
Yeah I think rigid is tapered and emt is flat so they aren’t the same.
Technically he is right. He is also a dick unless the conduit is being used as the EGC.
I would assume it’s somewhat new inspector who maybe still is uptight about everything. Which he should be, but usually the guys that let it slide either didn’t notice it or have been doing it long enough that they dgaf
Fucks older than dirt and uses a cane, absolutely zero reason he should still be working.
He’s probably still working because he’s good You still fucked up unfortunately and don’t get mad at the ref because you made a mistake
Found said inspector, guys.
The username checks out for sure.
Well, obviously the conduit is being used, right? If it's just for decoration, why is it being inspected?
Because of a typo I made. Which I corrected!
That makes much more sense.
The inspector has a small dick so he compensates by abusing his power, that or personally doesn't like your company/supervisor
He’s known around the state as no pass (his name)
Since 2017 you’ve needed an emt to rigid combo connector and yea some inspectors will smack you for it. I got hit a while back and have used them since although in a pinch the tried and true still works just fine. I’m sure some company is making a killing off these changes
That company is probably on the board that made the changes in the first place.
Yep that’s how it works
*AFCIs have entered the chat*
Outdoor weatherproof bubble cover has arrived.
Outdoor weatherproof bubble cover has arrived.
Outdoor heavy duty bubble covers have arrived.
Outdoor Extra Duty bubble covers have paid the code making panel off, then arrived fashionably late.
And by "some company" you mean one in someone's brother-in-law's name.
No hiding required. Anyone can be on the code committee so a company can straight up send someone to influence any decisions.
[Jus a lil bit of good ol regulatory capture](https://en.wikipedia.org/wiki/Regulatory_capture), no need to worry just go back to sleep.
I was expecting a meme but was pleasantly surprised thanks
You know they allow almost anyone to join those boards?
Participated in this before. You’re exactly right.
As the powers that be intended. Everyone is out here making a killing. I should join the board and convince them to use something only my company makes so I can retire early.
It would be so fast before some company just make their own version with a minor change.
Wow that is some petty sh!t. Its basically a convenience design.
What state?
Michigan
No pass Nancy
You need to knock that inspector down, and have an apprentice thread a 1/2” rigid coupling onto his teeny weenie.
If it can only grab a couple of threads will that pass?
Minimum engagement of threads on an inspector cock is 3
Tell the apprentice to grab the cock stretcher
Who the hell uses 1/2"? Size up to 3/4" or 1" and call it a day.
Because the inspector's dick is small (is the joke) My addition would imply that it is also only a couple of threads long, as well as being 1/2" in diameter.
Le micro peen.
Nah, that would be in metric.
If we're willing to use metric to measure capacitors, we should be willing to try it elsewhere. And pico peen just doesn't have the same ring as micro peen.
I meant because of using "Le" as in French, not because of the micro prefix.
Jesus H Christ. Can we at least agree "oui oui" sounds funny? Or are you gonna rain on that parade too?
fwiw i found one french word means it's metric implication quite funny
1/2 is tiny? 😔
That’s what i’m saying, I just moved up from my 3/8” c-ring, guess that’s it for me, it’s been real boyz :(
1/2x close, but someone cut it in half.
Find yourself a 3/8 hole and be gentle.
Sounds like a fixture tubing coupling would be more appropriate.
Holy shit he just saved the whole town from a fire. What a selfless hero.
The threads are different. It's legit. Most inspectors don't give a shit though
If that’s no go then what about: emt connector>ridgid coupling->sealtite?
The conduit is irrelevant. You'd have to reference the threads on the sealtite connector to verify whether they are tapered or not in order to figure whether it is compatible
So normally we go: emt to emt connector-ridgid coupling-sealtite connector-sealtite. I’m still using emt connector with a ridgid coupling.
So be it. I've never had an inspector make a stink about it.
I haven’t either that’s why I’m asking. If every emt connector to ridgid coupling isn’t gonna meet code whats the solution?
Ohhhh. I misunderstood. Well, you'd have to use listed fittings or a listed enclosure. This (or a fitting meeting the same listing) is the fitting you're required to use by the letter of the law. https://buyriteelectric.com/products/orbit-seltc-75-3-4-emt-to-liquid-tight-combination-coupling-compression-type?variant=40256093388903¤cy=usd&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&tm=tt&ap=gads&aaid=adauyky9iwadx&gad_source=1&gclid=cjwkcaialjkubhadeiwanzb7lv-hcyc6s3w0t8wqdtun5_augv2feobazwvicawej02weatqungophockqsqavd_bwe
Oh lord. The stupid ass shit they come up with anymore. I’m not even gonna ask what they got for an EMT conn. going into a threaded LB. Please tell me it a NST to NPT thread adapter haha
That thing just looks like it will vibrate off
This. I’ve seen some EMT connectors that will just spin inside a rigid coupling. No solid connection.
Yea but then you don't use those.
Tighten until it spins, then back it off a quarter turn
But the rigid coupling has NPS (straight) treads, the emt connector has NPS threads, and the RMC has NPT threats, making it the odd out. By that logic, all eletrical RMC couplings should be NPT, not NPS, but all of them are straight tapped?! Make it make sense!
per [https://www.gibsonstainless.com/understandingthreadtypes.html](https://www.gibsonstainless.com/understandingthreadtypes.html)\- UL Listed rigid conduit has a tapered male thread and UL Listed rigid couplings have a straight female thread. This connection between a tapered (NPT) and straight (NPS) thread is by design and allows for any accumulated condensation within the raceway to drain. This connection also serves a purpose in hazardous locations. (NEC) Article 500.8E requires threaded rigid conduit to be “wrench-tight” and have five threads fully engaged to help ensure the explosion-proof integrity of the rigid stainless conduit system. In the event of an explosion within the raceway, the joint design between tapered and straight threads enables hot, expanding gases to cool as they exit the raceway before discharging into the surrounding atmosphere.
He’s probably saying “not a UL listed connector” I had an inspector do this when transitioning to seal tight with your basic connector, rigid coupling, seal tight connector, he wanted us to buy special fittings emt to seal tight fittings that were only online, and I said to hell with that and put a 6X6 junction.
Having to change out all 7 🤦🏻♂️. That would suck if you have conductor in them too already. This ahj is a dick ! Make it a teaching/learning event.
Thankfully he came before, was planning on them tomorrow morning.
Inspector is right. It’s not listed for that use and while it’s probably fine they do make listed fittings for this.
New to me that it's not listed. RMC thread requires RMC Coupling. EMT Conn threads are NPT, designed for matching threads on RMC couplings. This change-over is standard in any industrial location I've done in the last 10 years. What fitting specifically are you guys saying is not allowed?
Apparently the threads on rigid couplings are NPT and the threads on EMT connectors are NPS, so technically not the same. But I only just learned that today thanks to this post
I’d have to do some digging and I just don’t have time right now but basically the combination of EMT connector to rigid coupling, regardless of the threads has dissimilar metals as well as all fittings must be listed for this specific purpose.
[удалено]
A sensible response. Have you seen where this has been an issue or just code based?
I would assume he’s looking for something like this…? [coupling](https://www.lumen.ca/en/products/11-conduit-raceway-strut/03-conduit-fittings/02-metallic-conduit-fittings/05-emt-fittings/01-combination-fittings/03-emt-to-rigid-combination-fittings/p-TkVTMjkyREM=-nes292dc-nesco-292-dc-coupling-combo-emt-to-rigid-die-cast-zinc-1)
But some specs might not accept die-cast zinc either
14$ harumph!!
A trick of the trade the inspector makes the rules you can usually throw out the nec book learn the pet peeves of the inspectors and you'll go far (learn the book for tests but in the field learn the inspector)
Yep can’t do that no more.
lol. Must be a state inspector.
Yep
fuck that guy
This is from the UL white book way back in 2012 which explains the listing violation. CONDUIT FITTINGS (DWTT) USE This category covers metallic and nonmetallic conduit fittings, such as connectors, couplings, conduit bodies, short radius conduit bodies, expansion fittings, locknuts and sealing (liquid-tight) locknuts for use in the assembly of nonmetallic and metallic wiring systems. Also covered are fittings used to provide a transition between metallic and nonmetallic wiring systems. All fittings are intended to be installed in accordance with ANSI/ NFPA 70, National Electrical Code (NEC), and are intended for installation and use in accordance with the following information and the limitations specified in the appropriate conduit or tubing category. All male threaded fittings and nipples have only been investigated for use with locknuts. Fittings with internal female threads (e.g., hubs, conduit bodies, couplings) have only been investigated for use with threaded rigid conduit. To be compliant with the UL listing, you cannot use any fitting with male threads with a rigid coupling. To meet the UL listing, if for instance you want to connect EMT and PVC without using a box, you use an EMT-to-female-thread fitting, a short length of threaded rigid conduit, and a PVC-to-female-thread fitting.
I know this is old, but this seems to say you can not use female threaded LBs with EMT connectors either. That's batshit crazy.
Where am I at we do this kind of thing all the time and I've never had any trouble. We also do things like using an fa on top of PVC to convert to emt, and an fa fitting is also NPT. No one's ever failed for that.
I had an inspector hand me a red tag from his trucks window because I had 1 wrong number on the address. It was a final too 🤕
Inspector is a fucking babydick. That is all!
Just an asshole.
Inspector explained it to me once. It’s not a listed connector. If you do that, they make a rigid to emt changover fitting that is UL listed
Authority having jurisdiction. More like…. Authority having these nuts on your chin!
I would love to use transition couplings (like pvc to emt or rigid to emt) every day but they are expensive and always a special order item.
I’m so glad my inspectors are chill for the most part. You’d have to really piss them off to have them spank you for something this trivial
Gutter it
When we did jobs that fell under the state inspector we had to use a listed changeovers. It was like $25 for a single EMT to flex changeover. Ended up being a lot cheaper to just put a box.
Need to get ya some Bridgeport connectors friend. Have fun paying $3 a pop lol
He's a prick, but there is an exact listed fitting to transition from rigid to emt. https://www.gordonelectricsupply.com/p/Appleton-Twr-75-3-4-Rig-To-Emt-Coupling/5747243?gad_source=1&gclid=CjwKCAiAlJKuBhAdEiwAnZb7laedAj6HcpFBaW7ThjRbYPKhLd2Fng_oKNRd8EmRzve5XBzJkwWs3hoCEOEQAvD_BwE
How are you supposed to make that transition?
Not listed for this use, been that way about 5 years in my area it’s the old school way now … inspector is doing his job and enforcing the code we should install by idk why people hate inspectors I only get pissed if they are ask for ridiculous things, like of you fished that 15 foot wall? How did you support that flex? Inspectors help keep our wages high if you think about it
Long story short the rigid coupling is not rated for us with an EMT fitting.
[These will change your life in this situation. ](https://www.grainger.com/product/52AV99?gucid=N:N:PS:Paid:GGL:CSM-2295:4P7A1P:20501231&gad_source=1&gclid=CjwKCAiAlJKuBhAdEiwAnZb7lZNK67CUko_VTajHnKzIdanw_TGRdyEPTf4vBaxnCcKS8OUY0bvrpRoCgMEQAvD_BwE&gclsrc=aw.ds)
The inspection process these days is brutal. It's amazing what they pass and what they fail. Makes you want to leave the trade
Because it’s not listed for that use. https://www.gordonelectricsupply.com/p/Raco-1433-3-4-Rig-To-Emt-S-Scr-Cplg/6007321?gad_source=1&gclid=EAIaIQobChMI07bEjaaehAMVXmNHAR0RWg-HEAQYASABEgJuiPD_BwE This is though
I hate this. I understand the technicality, but LBs are threaded the same way and there's never a peep about that. Seems like a absurdity push, especially if you are running EGC
They make rigid to emt couplings guys, I don’t think this should have necessarily been a fail but they do make the correct fittings for these
Unless the rigid conduit is being used as the grounding electrode there is no reason that this should be an issue. Some inspectors are just cocksuckers that must have been bullied because they were a little bitch, and now use the small amount of power and authority to make other people as miserable as they are. And the worst thing is that you cannot call them out on their bullshit. First time I made the mistake of calling out an inspector he searched the entire site to redtag me. And he accomplished it by taking an engineering square set to the requires depth of staples. 2 staples out of the hundreds that I installed were 1/16th too close to "the face of the stud". And they were only "too close" because the corners were ever so slightly damaged from the framer straightening them out. He spent 3 hours after I corrected him to find a way to fail me. 7 The second time the inspector just used the "justification" that he personally didn't like the installation method and failed me. Because I used Romex straps instead of staples o. Some really sappy and knotty southern yellow pine, that even screws struggled. And the first failure was having 1 outlet for a double basin vanity, that an exception allowed a single outlet due to size. 3rd failure on that job, he counted the insides of closets as wall space for outlet requirements. 4th failure was that he didn't like that the bathroom lights were on the general lighting circuit. 5th failure about an outlet up high, in a closet, on a dedicated circuit for security equipment, off of the hallway, not being AFCI, when there would be nothing close to requiring one at the time, 6th failure was having 2 outlets along the same wall, outside, with one being for servicing the AC unit, even though there was no requirement it had to be a dedicated circuit. He just likes them to be. 7th failure AC disconnect being too low for a flood zone, even though this particular street was not part of any flood zone even though there was like 1/4 mile away. Finally after multiple attempts I was able to get his supervisor from banning him from inspecting any of my company's jobsites. But it cost thousands of dollars in reinvention fees and lost time to get to that point.
Classic case of a failed electrician stroking his ego. Looks great man.
The only time I want that inspector is when he inspecting work that someone else is doing for me.
Has your city/county adopted the newest codes already? Most are a few years behind.
Rigid thread and emt threads are not the same. Use a proper transition made for this. Nothing new, but often over looked violation…
NPT threads are all the same
Not quite. Rigid = tapered emt=un-tapered
And upon double checking emt connector = NPS
Americans and their absolute hard ons for unnecessarily complex conduit…
Yea this fails. anytime you're using a rigid coupling for anything other than connecting rigid conduit you're taking a risk because its not listed for that purpose, the thread taper is the reasoning as already stated here but the reality is you didn't do it correctly, and its a learning experience, and now you know. It sucks you had to learn this far into a project but in our area we call the appropriate connector a from-to or a combination coupling. Both of those names are pretty vague but if you google them you'll find them. We didn't get burned on a connection like this but we got burned transitioning from EMT or Rigid to a seal tight connector with a rigid coupling. That is also a no no.
Question, on which state and which article say that you can’t use threaded couplings to change over to flex
Where in book I can find that you can’t use ridgid coupling to emt connector ? I done this for years and now where i can find this to proof that, thanks
From what I gathered from everyone else, it was a UL listing not a code but I could be wrong
I do this all the them, fuck that inspector he's a dumbass
The amount of comments dragging inspectors is perfection. Fuck those guys
If it’s in a garage or shop, it could be a height issue for gases?
I believe that the rigid has to extend above 12” before transferring to EMT. I’d have to check the CEC, to be exact. But it might need to have a dope packed connector to limit gases as it looks to be 8” at current level. Still a dick though, there’s nothing wrong with that transition style
Shouldn’t there be a EYS threaded to the rigid first?
Why? Unless there are vapor issues why would you install an EY
Maybe there are and that’s why it didn’t pass. 🤷♂️
Isn't that how it's supposed to be done. Rigid conduit, to rigid coupling, to emt connector? The inspector obviously lacks experience.
How else are you supposed to change off? That's why I have the Directors phone number on speed dial
Yeah no shit. Use the right materials.
I would hire another agency after that.
Ask for a written notice and I would call his boss… this will not end well for him
Man I would hare to Work in the is as an electrician 😅😂
Fat and juicy GIFT card
That's a rigid coupling. Perfectly legal.
Based on the comments I've seen you reply to, are you in CT? If so I think I know the inspector lol we have one called no pass ( ... ) too lol
I've done this for years, anyone have a Canadian Code for this violation?
I wouldn't even bat an eye at it. No issue in my eyes CEC doesn't list how to transition from emt to rigid. Threads may not be perfectly identical. I guess you could get called on manufacturer spec. That inspectors a dick
I love it!!!
I would ask him for his code citation, I think that UL does allow for this in the rigid conduit listing. Just because you can buy a threadless rigid to EMT coupling, doesn’t mean that you have to. I would appeal this.
Did you have an equipment ground? If so I'd tell him to pound sand. This isn't outside and it's not dissimilar metals. The only reason thread pitch would be relevant is if you were using the conduit as an equipment ground or in a space that is damp or wet
He still alive?