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What's the difference between RHW and RHW-2 insulation?

What's the difference between RHW and RHW-2 insulation?

What's the difference between RHW and RHW-2 insulation?

(OP)
Just poking around on US supplier websites it seems to me that the H indicates 75C and the HH indicates 90C.  I also found where H indicates 75 C and the "2" indicates 90C.  Then I ran into XHHW-2 and now I'm really confused.  Anyone know?

RE: What's the difference between RHW and RHW-2 insulation?

-2 is 90 wet.  HH is 90 dry.

RE: What's the difference between RHW and RHW-2 insulation?

(OP)
That's interesting.  Does the same thing go for USE and USE-2?  I always thought that USE was made for wet locations anyway.

RE: What's the difference between RHW and RHW-2 insulation?

For instance XHHW or THHN is 75 wet, 90 dry while XHHW-2 and THHN-2 are 90 wet or dry.  So, (no code book at hand) USE is likely 75 wet and USE is likely 90 wet.

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