Type USE cable was removed from the list of acceptable cables because it does not have the
necessary 90°C, wet-rated insulation required in PV module wiring. Type UF cable was
removed from the list because it is not readily available as a single conductor, and even when
available, is restricted in the Code (340.
and in the UL White Book (General Equipment
Directory-2005) to a 60°C temperature rating. Type SE was removed from the list because it is
commonly available only as a multi-conductor cable and may have only a 75°C insulation. A
listed and labeled Photovoltaic (PV) Wire, complying with a new UL Subject 4703 for such
cable, was added and is available for these installations. This cable has a 90°C, wet-rated
insulation that is more durable than SE and USE cable insulation and it has passed the longduration
720-hour accelerated sunlight/UV exposure tests. Passing such a test will allow the new
PV wire to be marked “Sunlight Resistant.” This PV Wire will also meet the requirements for
PV cables on the ungrounded PV systems allowed by 690.35.