This underground wire may be used for underground secondary distribution and service entrance applications at 600 volts or less. They may be either directly buried or installed in ducts, in either wet or dry locations. Underground Secondary Distribution Cables are especially suited for applications requiring superior resistance to abrasion, scoring and crushing. The underground residential distribution (URD) wire has a conductor made up of strands of compressed aluminum alloy 1350 series. It is insulated using cross-lined polyethylene (XLPE) that is black in color. Its phase conductors and assembled together with neutral conductors forming a twisted cord. This cord is mostly used in underground electrical wiring systems. Direct burial cable is a special type of electrical wiring, or cable, that is designed to be run in a trench underground. The electrical wires in the cable are encased in a thermoplastic sheath that seals out moisture and protects the wires within.
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