DOMTECH TEW For internal wiring of electrical equipment, for leads of transformers, motors, etc., and for luminous-tube signs and ignition systems. For use in raceways for Class 1 circuits. Conductors: 22 AWG to 4/0 AWG bare or tinned copper. Insulation: Polyvinyl chloride (PVC) Voltage Rating: 600V Temperature Rating: -30°C* to 105°C Dry, 60°C when exposed to water or oil. Flame Rating: FT1Standard: CSA22.2 No. 127- Equipment and lead wires.