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Overhead Service Drop Cable - Duplex Triplex & Quadruplex Reliable Supplier Overhead service drop cables are widely used to deliver electricity from utility poles to end-user premises. Depending on the customer service requirements (single-phase or three-phase), these cables are mainly classified into three types: two-core, three-core, and four-core. ZMS Manufacturing designs each cable type for specific applications, offering different conductor configurations and mechanical strengths to meet various installation needs.