A 2 way distribution board has space for just two protective devices, controlling two circuits. Primary distribution systems consist of feeders that deliver power from distribution substations to distribution transformers. It improves safety by enabling protection against overload and short circuits, and it improves reliability by keeping circuits separated and clearly. secondary unit substation is a close-coupled assembly consisting of enclosed primary high voltage equipment, three-phase power transformers, and enclosed secondary low-voltage equipment. The following electrical ratings are typical: As a result of locating power transformers and their close-coupled. The NEC ® has permitted up to six service disconnects in a single enclosure for decades. Several public inputs (code change proposals) were submitted during the 2020 NEC ® code cycle voicing concerns over electrical safety hazards that exist based on the old configuration, one of which is the fact. A distribution box, also known as a power distribution box or electrical distribution box, is used to distribute electrical power safely to multiple circuits. It helps organize, protect, and control electrical connections in residential, commercial, and industrial electrical systems.