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Vassar's 4-4-4 triplex URD cable is a 600V aluminum cable for single-phase underground service: two 4 AWG phase conductors and a 4 AWG neutral, twisted together. The conductors are aluminum with XLPE insulation, rated to 90°C and built for direct burial or duct runs, with ampacity of 125 A buried and 90 A in duct. It suits service drops from a transformer to a house, garage or outbuilding. Against copper URD it is lighter and easier to pull, but aluminum needs antioxidant and proper terminations at both ends. Buyers rate it highly, and the common notes are about handling the stiff coil and confirming the length before trenching.
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Buyers rate the cable highly and describe it as solid, well-made URD that pulls and buries cleanly. Complaints center on the stiff coil and on ordering the right length.
This is a triplex underground residential distribution (URD) cable rated for 600V. It is designed for single-phase secondary power distribution in underground electrical systems and can be direct buried or installed in ducts.
The cable has three 4 AWG aluminum conductors: two phase conductors and one neutral. Each is insulated with black cross-linked polyethylene (XLPE), which is water tight and resistant to corrosive substances, oil, heat and flame. The cable is moisture-resistant and heat-resistant, and it operates at up to 90°C in wet and dry environments.
The conductors are made in either concentric strand or compressed series. Compressed conductors are less bulky, stronger and tougher. Stranded conductors are more flexible and have lower electrical resistance. Typical uses include single-phase service drops from transformers to buildings, service meters in residential and rural areas, small commercial buildings, municipal facilities, street lighting, residential solar and battery storage connections, and temporary power for construction and events.
