Four Conductor Aluminum ACWU90-HL 600V XLPE Insulation Cable. ACWU90-HL is for exposed and concealed wiring in wet or dry locations and where exposed to the weather. It is used in ventilated, non-ventilated and ladder type cable trays. ACWU is suitable for direct earth burial (with protection as required by inspection authority), as well as for service entrance above or below ground. The cable is approved for use in and relating to Class I, II and III, Division 1 and 2 Hazardous Locations. Minimum recommended installation temperature is 40 Degrees C. Maximum normal operation conductor temperature is 90 Degrees C.