US Patent 7724507 Arc flash enclosure

An enclosure assembly includes a first enclosure unit including a first door, a second enclosure unit, and a handle coupled to the second enclosure unit, the handle being operative so as to turn on or turn off power to the first enclosure unit, and wherein the first enclosure unit and the second enclosure unit are configured such that the first door cannot be opened if the handle has not been turned to a power-off position.