Voltage 600V Construction Sino-cables type URD are manufactured with compacted 1350 aluminum or 8000 series aluminum alloy conductor insulated with black XLPE. Two or three insulated conductors and an neutral wire are cabled together. Single core, duplex, triplex, quadruplex are available. Standard ASTM B231, B800, UL854,ICEA S-76-474, or other standards required by customers.