Secondary wiring: used to control, measure, protect, and indicate signals for the primary wiring. The main differences between the primary wiring and secondary wiring of the distribution cabinet are as follows: Function Primary wiring: used to realize the transmission, distribution and control of electric energy, directly connected to the power supply and power equipment, responsible for the. Primary distribution systems consist of feeders that deliver power from distribution substations to distribution transformers. A feeder usually begins with a feeder breaker at the distribution substation. Many feeders leave substation in a concrete ducts and are routed to a nearby pole. The following electrical ratings are typical: As a result of locating power transformers and their close-coupled. While primary switchgear operates at the initial stages of power distribution and handles higher voltages, secondary switchgear works further downstream to manage medium-voltage and localized networks. Understanding the distinctions between these two types is key to optimizing power distribution. This guide will walk you through the essential steps to design and wire an efficient PLC control cabinet. What is a PLC Control Cabinet? A PLC control. This document specifies pole−top metering installations for new service and Net Generation Output Metering (NGOM) installations using outdoor−type instrument transformers cluster mounted on a prefabricated aluminum bracket.