I'm going to have to retract what I said about Class 2 cables being used outdoors.

I dug out my UL White Book and under the heading "Power-Limited Circuit Cable (QPTZ)" , the basic listing only covers use "within" buildings. Since that means inside, cables outside would need to be marked "wet location" and to me, that would apply even if the cable is installed in a raceway (see def. of wet location).

That said, there are probably millions of installations of CL2 cable exposed to the weather (my air conditioner is one of them) and of the ones I've seen, I've never seen damaged jackets or bare conductors.

I agree that because of the low voltage and energy involved that there is little chance of shock or fire.

Few things are harder to put up with than the annoyance of a good example.