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They are rated for voltages up to 600 volts, and are approved for use in wet or dry locations up to 90°C (75°C when exposed to oil). I am running 4 conductors plus ground in EMT on asphalt shingle roof in Southern California. EMT is 3/4 and about 1 inch off the roof on conduit supports. It’s carrying AC current from Enphase microinverters, from 2 branches, around 10 to 12 amps each. But without knowing the temperature you're dealing with - or the number of current carrying wires in the conduit (nor even what size wire you're using) I can't say for sure that the ampacity after derating is unimportant.
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Unique High End Canal House
THHN stands for thermoplastic high heat-resistant nylon. Known for versatility and durability, it is the most common type of building cable. The double marking THHN /THWN-2 indicates that the electrical wire is suitable for wet and dry conditions equally (The letter "W" means that it is water-safe). Additionally, the cable is resistant to corrosion, excessive dryness, and the impact of chemicals.
We supply wire & cable in convenient lengths, and always pay the freight. We ship from a national network of distribution centers. A common problem is that people will use cable ties to secure wire outdoors, and forget that the cable ties must be UV rated as well as everything else. Most often, black cable ties are UV safe and white ones are not. Bottom line - the THHN wire at HD and Lowes is not listed as type PV (or another type that's rated for UV exposure).
where to buy THWN-2 cable?
The John Wiles document explains this calculation, too. This canal house on the Prinsengracht is completely renovated. Until recently we lived there ourselves and it is beautifully decorated .
THHN wire is normally installed in conduit, and is used in residential and commercial applications. THWN-THHN-2 wire comes in standard AWG sizes from 14 AWG to 4/0AWG and larger sizes 250 MCM to 1000 MCM. Sizes 14, 12 and 10 AWG can be either solid or stranded conductors. THWN-THHN-2 wire comes in a variety of 10 standard colors. It's good wire, but not for use directly in the sun. In your use, the wire isn't exposed to UV, so you're fine.
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Cycling plays a vital role in the lives of the Dutch. There are plenty of places to hire them such as MacBike and Rent-A-Bike. Our apartment is in the centre of Amsterdam on the South part of the canals near the 'Spiegelgracht' where all the art galleries are.
Home Depot sells THHN that says THWN-2 on the jacket, Lowes sells the same brand same looking THHN that says THWN on the jacket. Both are rated to withstand oils/gasoline and are rated up to 90 degrees C. In summary, my recommendation is to go with #8 THWN-2 in conduit. And have the John Wiles document on hand, the local inspectors revere him, and most of them had a course from him last month when he visited. I was able to reverse one of the inspector's objections by showing an article by Mr. Wiles where he recommended exactly the practice I had employed.
The building wire is rated 90 degrees Celsius in both wet and dry locations. You can purchase PV wire that can be run exposed on a roof that already includes the MC4 connector. You would then run that wire into a junction box where you can continue with standard wire insulation leaving the junction box in a conduit as long as it is rated for the environment . Not all TC cable is rated for 90 C, so you will want to check the specification carefully if you ever plan to put more current through it.
So I should be fine running THWN in EMT on the roof? Because I kind of already ran it before realizing that the Lowes version was different from Home Depot version. Or is the inspector not gonna like seeing THWN in EMT on the roof? It used to be acceptable to use metal conduit itself as a ground, saving one wire, but recent code no longer allows this in the general case.
Without being too bulky, it ensures that the cable can be used in harsh conditions. The jacket is color-coded in accordance with ICEA Method 4. 2 copper wire, 2 building cable, 2 hook up wire, 2 conduit wire, 2 nylon wire, 2 construction cable, 2 thermoplastic-insulated copper wire, 2 THHN-PVC tray cable, 2 "spaghetti" wire. Electric Wire & Cable Specialists is a full-line supplier of Electric and Electronic Wire & Cable and Accessories.
It's not listed for use outside of a conduit/raceway. While I can't say exactly what the inspector will agree with, I can say that THWN in conduit should be acceptable. If you want to run the wire exposed it will need to be "-2" rated. I believe most panels have "-2" rated wire which terminate to an MC4 connector. A spacious 1930s detached house built on one of the most beautiful plots right next to the water in the Amsterdam Old-South area.
Or if the wire was out of conduit, I could have passed. The inspector was fine with non-UV resistant wire entirely enclosed in conduit, which is what I used as a replacement. I think you only need UV-resistant insulation if you plan to run naked wire outside.
That's perhaps $90 of wire, compared to maybe $60 for #10 THWN.
Difference between THWN and THWN-2?
In some parts of the country, I'm sure its a given that roof temperatures will exceed 70 C, and in such places, there is no hope for 75 C wire, but not everywhere. If the current is low enough, and the deratings are applied properly, you might be ok. Especially with only 5A running through the wire, I'm pretty sure you could meet code with #10 THWN in San Jose, Joe . If uncertain, you could always go to City Hall and request a review of your plans by an inspector. Plain THWN should serve for your application, unless you expect ambient temperatures in your location to exceed 70C.
The apartment also features a large open plan kitchen/lounge area with lovely fireplace. THHN THWN-2 conductors are constructed of annealed soft copper that follows ASTM B3 and ASTM B8 standards. I do not believe that most THHN/THWN-2 is also listed as type PV. I'm not aware of any THHN/THWN-2 that's also type PV. I think there's a good chance that the temperature rating doesn't really matter for the OP's use.
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