Although alternate constructions are available, the most commonly used types for trade purposes are solid or 7-strand bare copper conductor, with the smallest UL-recognized wire size of #14 AWG (other gauges are available).
RW90 is suitable for most current industrial lighting or power wiring solutions in conduits, ducts, or other approved raceways, especially those where better insulation toughness and resistance to moisture and heat is needed.
Please consult Article 310 of the most recent edition of the NEC for approved ratings in various applications.
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