electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Yes I use those frequently
Chase nipple ul listed for Bonding
- Thread starter AC\DC
- Start date
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Fred B
Senior Member
- Location
- Upstate, NY
- Occupation
- Electrician
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
I know. I was suggesting an alternative that should satisfy bonding and spacing concerns.
TwoBlocked
Senior Member
- Location
- Bradford County, PA
- Occupation
- Industrial Electrician
Now that, I would use as a bonding connector. That is if I used a bonding connector when I could use a bonding wire instead... It's an industrial thing.
Dsg319
Senior Member
- Location
- West Virginia
- Occupation
- Wv Master “lectrician”
I’ll often see people use these indoors on transformers or panels entering in with an LB and using these instead of a close nipple with lock rings.
Not sure if they are allowed to be used like that
letgomywago
Senior Member
- Location
- Washington state and Oregon coast
- Occupation
- residential electrician
I use box adapters that way often but it's pvc then so no issues with bonding everI’ll often see people on use these indoors on transformers or panels with an LB instead of nipple and lock ring.
Not sure if they are allowed to be used like that
I try to avoid using garbage die cast fitting into & lock nuts especially outdoors. Had way too many die cast lock nuts split after not even going crazy tightening them. NEC should just mandate that a wire must always be used for grounding verses long term unreliable use of conduit or armored cable. Have came across too many rusted thru conduits, broken pieces of sealtite and EMT that were pulled out of fittings all creating a dangerous non grounded condition due to no ground wire was installed. While I'm on a rant wish the NEC would outlaw AC cable. In my area for last 35 years you must use far superior type MC cable in commercial sites rather then AC cable.
letgomywago
Senior Member
- Location
- Washington state and Oregon coast
- Occupation
- residential electrician
Try saying this to a industrial planner who does rmc everything and they'll look at you as a little silly. Often those use conduit bodies for splices that don't even have a spot for ground screws.
Also NEC isn't a design manual
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Many, including me, will vehemently disagree with you here. In a recent thread in fact I was complaining that AC cable should be more common over MC. I do think minimum fitting quality needs to be a bit higher and/or enforced.
I believe that threads on chase nipples are never tapered like threads on rigid heavy wall conduit. That's why a locknuts usually will easily spin to neck of chase nipples but not on rigid conduit. Maybe 7 or 8 years ago at a continuing education class was told you should never screw a chase nipple into a heavy wall coupling. And yes I have screwed 1/2 to 2" chase nipples thru a box or pecker head into a heavy wall coupling made up wrench tight and they never came loose but always pulled a ground wire.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
I saw this on a box the other day. Manufacturer instructions seem to contradict UL listing regarding threads.
- Occupation
- Licensed Electrician
Good find. So we can use a chase nipple with a rigid coupling.
Thanks for this great picture. I checked threads on several 1/2 & 3/4" T & B insulated & regular chase nipples and steel locknuts spin easily up to hex shoulder making me to believe they do not have tapered threads. Will have to dust off my micrometer and see if I can find a difference .
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
EMT connector is bonding a single enclosure (possibly with the locknut penetrating through painted finish) to the fitting then to the raceway. Same thing occurs at other end of raceway when you hit another enclosure.
The chase nipple is bonding one enclosure to the fitting (possibly with the locknut penetrating through painted finish) then to the other enclosure with no method of penetrating through any painted finish on that smooth end.
If anything I can see a need to remove paint to allow for better continuity. Bare metal enclosures this should be no problem though as long as you don't have dissimilar metal galvanic type issues involved.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
If you look closely at the photo it tells you the thread type, NPSM.
Did a Google search and it stated NPSM ( or American Standard Straight Mechanical Pipe Thread ) and they do not have a taper pipe thread. Type NPS stands for National Pipe Thread and have a tapered thread. When I started as an apprentice our electric shop had an old set of 1/2 to 2" Rigid stock & dies that only the sparkies were supposed to use. A know it all plumber asked to borrow them and I tried to explain that I was told they were not for use on plumbing pipe. Of course he told me that I was another dumb rookie. He threaded at least halve a dozen pieces of schedule 40 pipe for a 125# steam line. He spent hours taking first leaking joint and applying more pipe dope, put it together then tried fixing next leak. End of day somebody in our shop that heard our conversation told him he used the wrong dies. These dies did not produce a tapered thread and hopefully no longer produced. Came across European 2 to 5 KW immersion heaters that had straight threads. Some how it was the electricians job to remove bad heaters & wrench in new ones. Luckily we had a very talented chief electrician and he finally told us how to stop threads from leaking water. After we applied several layers of Teflon pipe tape wrapped two pieces of sewing threads onto taped threads. These heaters were on melting kettles and little pump only produced 10# of water pressure.
I was taught that NPS threads are straight and NPT are tapered.
Eddie702
Licensed Electrician
- Location
- Western Massachusetts
- Occupation
- Electrician
I had an inspector once that didn't like me. I told him once that we could go to Boston before the state board to settle our dispute. I had done a 25' tap in a commercial building, and he did not want to allow it without a fused disconnect at the source of power. He told me the tap could only be "about 18"" He backed down on that one. But every job after that he would find something even if it was perfect. I was doing new houses back then. So, after that I would leave a receptacle & box missing somewhere on purpose and leave a capped whip of Romex in the wall.
He would usually find it and was then happy because he "got me" and he would never notice anything else wrong on my jobs.
And yes. Plumbing dies and electrical dies are different. NPS is straight and NPT is tapered.
He would usually find it and was then happy because he "got me" and he would never notice anything else wrong on my jobs.
And yes. Plumbing dies and electrical dies are different. NPS is straight and NPT is tapered.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
I don't think plumbing and electrical dies are different. But yes NPS and NPT are different.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Electrical dies are required to be NPT (same as plumbing) because the field threads on RMC and IMC are required to be tapered.
- Status