Avoid covering the distribution board with any materials or obstructing the airflow around it. However, in actual applications, distribution boxes often encounter a series of problems, which not. However you must test to ensure that the board is dead before doing any work within it, and you must never leave the board with the cover removed for any reason. When the work is complete, test the. Switch box shall be distributed by the final sub-distribution box. Older boxes are grey; newer boxes are black. The outer casing is typically a thick, weatherproof steel enclosure that is securely locked and designed with anti-tamper features to. Electrical panels, also known as breaker boxes or distribution boards, are essential to any electrical system.