NMWU to oznaczenie kabla wg CSA (Canada): NM = Non-metallic sheathed cable; W = Wet locations (UNVERIFIED letter reading); U = Underground (UNVERIFIED letter reading); NMWU = Non-metallic sheathed cable for wet and underground use, 300 V. 300 V, 60 C conductor limit. CSA C22.2 No. 48.