The in-wall rating in Canada is FT4 which is essentially the same as CL2. The FT4 rating only concerns vertical fire spread times, IIRC. CL2 deals with toxicity as well. If I remember a CL2 rating is slightly less than an FT4, a CL3 is pretty much the same.

Found this handy page:

http://www.awcwire.com/techlibrary/16.17.pdf

Jason
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