Electrical conductor types in the NEC
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- Опубликовано: 31 май 2024
- What does THHN/THWN-2 even mean? This video covers the most commonly installed electrical conductors and explains what those pesky letters mean, including conductors, fixture wire, and flexible cords.
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This is so much more informative than class unfortuneately
As a inspector, I think you for what you’re doing. This is the only certification I don’t have an in California I’m doing inspections. About 10 years ago I missed the commercial test by two questions. I have four more years to my retirement so I’m not going to get my certification but I’m listening to you so I don’t make mistakes. Thank you again
Man you had exactly what I was looking for. Thank you.
Thank you Ryan. I just finished your video. Very complete and detailed as always. I learn something new every video. Solving the mysteries of the code book.
Ryan thanks for another great vid. My chief electrician dad was one of the first people in our area to use THHN/THWN in late 60's. When he went to order several thousand feet of THHN supply house never heard of it. A salesman from a wire manufacturer dropped off samples. Appeared to get abused first couple of years. Guys were using #14 THHN on 20 amp circuit breakers and even some put #12 THHN on 30 amp circuit breakers.Heard they are kicking around making 14 gauge copper clad aluminum NM cable for LED'S on a 10 amp breaker. Can see Johnny homeowner seeing 14 gauge and using aluminum clad wire on 15 amp circuit breakets. Twice this year while at the electrical isles at big box stores saw homeowners purchase non TR receptacles for their homes. Told them that they should only use TR receptacles in houses. Older gentlemen stated that there is no kids living in his house so he does not need them. Told him that my kids are grown and moved out but 3 young grandkids are there several times a week. Wish the big box stores would either have sign age up or stop selling non TR receptacles. Would be best if NEC would not let non TR receptacles be produced.
Unfortunately older folks with arthritis and other limitations have the most difficulty with those TR receptacles. Code is code but people are going to generally do what works for them.
Non-TR is still allowed in most commercial construction so why would manufacturers stop making them and why would a big box store stop selling them?
The type of DLO, Diesel Locomotive Cable, commonly sold is also rated RHH, RHW-2 and Type W cord. The old original DLO cable, with no other rating, cannot be used for building or temporary wiring. It was only for trains.
the best explanation I ever heard thanks for your time
Thank you , Ryan . Excellent .
Thanks for doing these vids
Thank you very much for your time.
At the large hospital that I retired from contracted pulled 3 large DLO cables thru 4" conduit that had 360 degrees in bends. After they killed them selves pulling first conduit with only lube in head they had a guy with a paint brush lining entire run. Told me the rubbery insulation was stocking to wall of conduit. Was wondering if anyone else had this problem. They were using a powered puller for pulling cable.
DLO cable is not an NEC recognized wire. Some has dual ratings as RHW I think it is which would make it a compliant conductor but without the dual rating it can't be used.
You are amazing man. Thanks a lot!!!
Hello.. would you do a video on how size wire, overcurrent and overload for transformer and motor...
Let's say we have TGGT wire attached to heating elements(industrial or not[e.g. cooking ovens]) Where can we transition to typical supply wires(THHN)? Terminal blocks at a distance? Copper conducts heat very well. 10'?, 50'? I may be naive but I've not found that transition point in NEC. We definitely need a method to go from hot to cold. Beat me up if you need to. I'd like to know.
At the 7 minute mark, you explain how the nylon coating of thwn is required for gasoline and oil resistance. However the next line says pvc is gas and oil resistant. Also it states that the nylon is to provide "enhanced" resistance, which implies that the nylon is optional.
Absolutely correct.
very informative
"Polyolefin is a lightweight, functional polymer that displays a unique combination of physical properties and characteristics due to its distinctive molecular structure."
Ryan, is SER cable limited to 60 degree C? Some experts have said it is not. What do you think?
See 338.10(B)(4)(a). But the short answer is "no."
@@RyanJacksonElectrical Awhile back, I installed # 2-2-2-4 AL, SER cable for a sub. panel and installed a 90 Amp. breaker in main panel. Local Inspector wanted me to use a 70 Amp. breaker instead and insisted on saying that 60 degree C shall be applied.
@@RyanJacksonElectrical didn't 334.80 used to apply to interior installs?
@@jeffbower5525 That section (338.10) was revised every three years from (about) 2011 through 2017.
@@RyanJacksonElectrical that makes sense. I thought I remembered a time where it didn't exclude 334.80.
New sub ☺️
👍👍
Haven't seen a video up in a while are you doing alright? Just odd not seeing you in the notifications hope all is well and to see a video sometime soon! God Bless!
Yeah, sorry. Just too many irons in the fire.
Thanks!
Hi thanks for that comment lol
BTW, DLO, from a design standpoint is very useful....it bends, it conducts, it works. If you get it wet, it disintegrates...fair warning...use it, don't abuse it.
Not true for the type of DLO commonly sold, which is also rated RHH, RHW-2 and Type W cord. The old original DLO, Diesel Locomotive Cable, with no other rating, cannot be used for building or temporary wiring. It was only for trains, and could handle water.
@@besafe9 The usefulness of it(for my purposes anyway) is in control/power panels that have very limited space. You can bend it easily, you can terminate it easily(crimped lugs are best) I've not encountered any DLO that is not dual rated. Yes, if you get the exposed copper wet, you can count on it disintegrating very quickly. Saying 'not true' is a pretty harsh thing to say.
“We” versus “they”: When WE acquire a former THEM (a competitor), management often gives the there’s-no-more-US-versus-THEM integration speech. Nonetheless, to most inside the acquirING company, THEY becomes a “TUFKAT” (The “Us” Formerly Known As “Them”). Hahaha
That was a journey!
Thanks again for the videos.
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Show us the dogs! If you have animals making noise in a video, you're required by law to show off the animals. :-)
Ryan, time for a lapel microphone, the echo chamber sound is hard to listen to.
Conductor, we have a problem