Connect the neutral feeder conductor to the neutral bus bar. This is the most crucial step in sub panel wiring. The neutral bus bar must be isolated from the panel enclosure so that the neutral is not bonded to the box. These smaller breaker panels, also known as sub-distribution boards, are commonly used to provide power to secondary circuits within a building. Bonding (connecting) the neutral and ground should only occur in the main panel or at the first service disconnect. The following electrical ratings are typical: As a result of locating power transformers and their close-coupled. Understanding Grounding for Sub Panels: When you add a second electrical panel with separate neutral and common bars, do you ground the common to the box along with a ground rod connection? How to Add a Sub Panel to Expand the Circuit Breaker Capacity. Outgoing feeders from a primary distribution substa-tion are typically feeding secondary distribution substations and bigger, most often industrial type, consumers.
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