THHN
- Thread starter GSXR600
- Start date
- Status
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
From the Southwire site, Google THHN:
UL listed sunlight resistant in black sizes 2 AWG and larger.
-Hal
UL listed sunlight resistant in black sizes 2 AWG and larger.
-Hal
I don't think there is any guarantee of it being sunlight resistant by code -- will be manufacturer specific. That said, just about all THHN I've seen in sizes 6 and larger have been sunlight and oil resistant. I used it in a service mast.
DARUSA
Senior Member
- Location
- New York City
Plain THHN is not rated for wet location. THWN-2 yes and it is Sun light resistance!!
K_Buz
Member
- Location
- Southeastern Wisconsin
All I have ever used for services is THHN.
Years ago, we did a service upgrade. The service's location changed. We had to temp the new service to where the drop hit the building. If I remember right it was about 10' away. We had always used 8-3 NM to make that temp connection. We failed that inspection because of the temp. He wanted us to replace the NM with 3 individual #8 THHN conductors. We did, and it passed.
Years ago, we did a service upgrade. The service's location changed. We had to temp the new service to where the drop hit the building. If I remember right it was about 10' away. We had always used 8-3 NM to make that temp connection. We failed that inspection because of the temp. He wanted us to replace the NM with 3 individual #8 THHN conductors. We did, and it passed.
- Location
- Massachusetts
As was noted, it is manufacturer specific not all THWN-2 is sunlight resistant
DARUSA
Senior Member
- Location
- New York City
Ok ,but can you use THHN in a wet location ? How it can be permited for service drop?
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I think we all use thhn to mean thhn/thwn since almost all of it is dual rated.
- Location
- Massachusetts
No, what I am saying is a lot of THWN-2 in smaller sizes is not sunlight resistant.
You pretty much have to check every time, either read it from the wire or from a cut sheet.
UL Wire and Cable Marking Guide table regarding THHN/THHW sunlight resistance references note 35, which states, "A product evaluated for sunlight resistance is marked “SUNLIGHT RESISTANT”, “SUN. RES.” or "SR."
- Location
- Massachusetts
What would you use?:?
I'd use XHHW, but here we have to run the service in pipe and AL is a lot less than CU. $$$$$
What's Al got to do with it? Insulation types being discussed here are available in both Cu and Al conductors.
- Occupation
- Licensed Electrician
I have never seen Al THHN and rarely see Cu XHH.
I've seen a lot of Cu XHHW (XHHW-2), and rarely see any Al anything
Again, what's that got to do with it???
- Occupation
- Licensed Electrician
It's just natural to associate one insulation type with the conductor.
I've seen a lot of Cu XHHW (XHHW-2), and rarely see any Al anything
Again, what's that got to do with it???
Bob asked a question,"What would you use?" So I answered it. You may not see AL anything but all that means is your doing a different type of work. When it comes to making money and there is nothing requiring CU in the spex Why not use AL? It is less expensive, it preforms just as good as CU (if not better) and it is easier to work with. I would even argue, to a tree hugger, that it is "GREENER" then copper because it is less dammaging to the environment.
- Status