We installed a 400 amp service and used Thhn wire in a 3" Rigid Pipe riser.. The inspector said you can't use Thhn wire exposed because it is not sunlight resistant..You have to use XHHW. is that correct..
Had a strong hail storm in the area three days ago. I put a 240/120 V 200 A residential service riser back on the side of a house (tree limb came down on the drop).The inspector said you can't use Thhn wire exposed because it is not sunlight resistant..You have to use XHHW. is that correct..
The nylon case is there to resist abrasion while pulling, once installed it really serves no further purpose. It's not the nylon that needs to be sunlight resistant, it's the PVC (or XLP).Had a strong hail storm in the area three days ago. I put a 240/120 V 200 A residential service riser back on the side of a house (tree limb came down on the drop).
From the manufacturer's date stamped in the meter socket, the mast had only been up for six years.
The THHN / THWN-2 conductors were clearly stamped "Sunlight Resistant" along with all the other information.
Here's the thing that I noted: The nylon slip cover, where exposed to open air on the North face (no direct sunlight) of the building, had seperated from the insulation like a molting snake skin. The stamped label remained, as it was stamped below the nylon.
Cannot be THHN inside or outside of the conduit.
Must be clearly labeled Sunlight Resistant
Bad choice for a service anyway
My point, exactly.Most THHN I have used here out west was labled THHN/THWN I have never seen THHN only.
So what is the problem using THHN/THWN in a riser to a service head to a drip loop as long as it says " sunlight resistive"
It's new in the '08.I don't have a 300.9.
300.9 Raceways in Wet Locations Above Grade.
Where raceways are installed in wet locations abovegrade, the interior of these raceways shall be considered to be a wet location. Insulated conductors and cables installed in raceways in wet locations abovegrade shall comply with 310.8(C).
(And this is the Handbook commentary) Section 300.9, new for the 2008 Code and similar to 300.5(B), draws attention to the inside of all raceways and enclosures installed in an abovegrade wet location. The inside of these raceways and enclosures now definitively requires conductors and cables suitable for use in wet locations in accordance with to 310.8.
I don't have a 310.8(C) either.It's new in the '08.