Rockwell Automation Technologies Incorporated

Artur Wiertek

Troy Micheal Bellows

Pawel Kokula

Daniel Jastrzebski

Maciej Lewandowski

Piotr Badura

Slawomir Styczen

Tomasz Lorek

Krzysztof J Blok

Radoslaw Zacharzewski

Grzegorz A Naczynski

An electrical enclosure, such as a Motor Control Centers (MCC), can include a ventilation system providing airflow while protecting from both ingress of solid objects as small as 1.0 millimeter and egress of gasses from an arc flash by providing a protective mesh with holes having a dimension of less than 1 millimeter, a bracket coupled to the mesh for providing a rigid support, and a flap configured to seal against the bracket and block the mesh in response to a pressure wave produced by an arc flash. The flap, normally open for airflow, can close in response to the pressure wave, by bending at a perforation line to move the flap toward the mesh. The electrical enclosure can also include a normally closed exhaust system. The exhaust system can be configured to open in response to the pressure wave to allow the gasses to escape.

Isolation and exhaust system for an electrical enclosure

The detrimental effects of environmental hazards on units having withdrawable stabs or contacts may be overcome by using fixed feed units in compartments in a manner akin to withdrawable units. In particular, multiple fixed feed units may be provided in a single section or column by implementing vertical bus bars providing multiple connection points particular to fixed feed units. As a result, fixed feed units may be mounted to the vertical bus bars, as opposed to horizontal main bus bars or requiring complex wiring, thereby allowing multiple fixed feed units to be efficiently provided to maximize space. An electrically insulating bus support, which may be supplemented with bracing, may provide improved short-circuit protection. Electrically insulating covers over fixed feed unit connections may also provide electrical isolation in the system in accordance with industry standards. Moreover, in one aspect, fixed feed units and withdrawable units may be intermixed.

Fixed vertical distribution bus bar

A power terminal enclosure may be used to provide power conductors (power terminals) across electrical isolation boundaries while providing electrical short-circuit protections. The power terminal enclosure may be a single article molded from an electrically insulating material. The power terminal enclosure may also be dimensioned to provide sufficient separation distance between other power terminal enclosures for a given maximum voltage of a power conductor (power terminal) so that power conductors enclosed by the power terminal enclosures are properly spaced apart with a minimum separate distance. The power terminal enclosure may also include a mechanical retention mechanism, such as a snap-fit retention area, for mating with a power conductor enclosed by the power terminal enclosure. The power terminal enclosure may partially pass through an opening in an isolation barrier (such as a wall and/or plate), with the power conductor passing through the power terminal enclosure.

Power terminal enclosure for power conductors

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Artur Wiertek