Check out the print legend at the bottom of the datasheet; it should always say "PHOTOVOLTAIC WIRE", and may also have other markings like USE-2 and RHW-2. PV Wire should be listed to UL 4703, which is the outline of investigation for PV Wire: http://ulstandardsinfonet.ul.com/outscope/outscope.asp?fn=4703.html.
Isaac Opalinsky
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