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As long as it has a "W" on the jacket it is permitted for wet locations. As Iwire said THHN is usually dual rated as THWN. I ordered some THHN recently and it was rated THWN on the jacket. Looks to be the exact same wire. Check the wire jacket.
Re: THHN/THWN/MTW rated wire in sunlight See 310.8(D) Unless the THHN that you installed is rated sunlight resistant you will have no firepower. I have only seen the larger sizes actually marked as sunlight resistant and don't know if the smaller sizes are available as such..
Such as THHN feeder wires for a sub-panel or some such. However, after looking in the code book, article 300.3(A), states: single conductors specified in table 310.104(A) shall only be installed where part of a recognized wiring method of chapter 3.
Then I get a NEC code reference to 760.130 saying this allows you to use THHN on Power Limited Fire Alarm Circuits so I looked it up and found that on the load side of the Power Limited Fire Alarm power source you can use wiring methods and materials in reference to 760.46 which addresses installation of non-power limited fire alarm circuits ...
I'm not sure I understand art 392.10 of the NEC. I'm running data CAT6 and #10 THHN under a raise floor , and I intend to use a wire basket for the CAT6, but also was looking permission on the NEC to share the same tray with the power cables or at least run another basket side by side.
GoldDigger said: One (expensive) option is PV wire. That [can be] 1000V [rated] and is also available up to 2000V. It is more expensive than the equivalent wire size in THWN-2. But the tradeoff is that you can use a much smaller size, for a given amount of power. Double the operating voltage means half the current.
Sent from my SM-N960U using Tapatalk. Correct on the USE, it can't be used inside unless it also has another rating that is allowed inside. RHW is allowed inside. THHN can't be used outside the building unless it is dual rated - typical is THHN/THWN/THWN-2. If it doesn't have the W in it it can't be used in wet locations.
Master Electrician. Jan 16, 2020. #16. You can use the 90 deg C column for the starting point for conductor bundling and ambient temp correction. After you correct for that, if the conductor ampacity is greater or equal to the 75 deg C you are ok. If under the 75 deg C value then go up a size or look at the bundling.
Given the price of copper, what are thoughts about using THHN (in the appropriate size) for the GEC? I need to update a 100-amp service in a small building. I have various scrap chunks of #6, both THHN and THW, some that I scrapped out of previous jobs and I just kept hold of. Now I am looking at the idea of using them for the GEC to the ground ...
When running wires underground through PVC conduit to feed a garage, is THHN or THWN the proper type to use? Suppose a garage is to be wired with a subpanel fed from the house by a 40-amp 240V breaker. They would use each a red, white, black, and green #8 AWG copper conductor, but what type of...