Page of 2. Filtered by:. Previous 1 2 template Next. My googling skills seems to be failing me as I cant find an answer to this question. I know that -2 means its dual rated for wet and hot locations. But based on the jacket and the name "W" means wet, and temperature rating is the same between the two at 90C. So whats the difference then? Tags: None. Originally posted by Duxa View Post. Register to Post. Comment Post Cancel. Originally posted by SunEagle View Post. The "-2" rating withstands degridation from UV light and can be exposed to the sun.
The "W" allows for installations in wet areas or outside. Dont have to get THWN-2? When designing and building a new facility or machine, engineers need to fully understand the specifications — the strengths and weaknesses of each wire available for the job. The biggest challenge for an engineer is to balance the best wire for the project and the budget. As you can see, XHHW-2 has a much higher tolerance for heat — an important factor to consider.
THHN wire is also commonly used in machine tools, control circuits and some appliances. In addition, the jacket protects the wire from hydrocarbons such as oil, gasoline and grease. THWN wire is the same, but the "W" stands for water-resistant.
The main difference between these two standards is their maximum temperature in wet locations. The major difference between these two wires is their insulation. This material is cheaper than XLPE but can emit toxic smoke if burned. XHHW-2 wire also features better low-temperature durability and electrical properties. Even though these wires have the same voltage rating and application uses, it's clear they have their differences.
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