Heavy duty cable connectors are robust modular interfaces designed to transmit power, data, and signals through a single housing. When used at the main cable entry of a distribution box, they replace traditional cable glands or hard-wired connections. Adapt your signal, data, and power cabling to your specific requirements. We offer a wide range of designs and. Primary distribution systems consist of feeders that deliver power from distribution substations to distribution transformers. Many feeders leave substation in a concrete ducts and are routed to a nearby pole. Available in standard one, two, or three pole configurations, these blocks meet a broad range of system.