Abstract: A frangible cover, generally made of a synthetic material, such as plastic, which fits over and grips the “hot” or energized bus bars in an electrical breaker box and fits under the insulating panel fingers in the breaker box. In this arrangement, the novel frangible cover is locked in place in the breaker box until the installer acts to remove all or part of the cover. The cover is scribed in a pattern so that it can be partially removed one or more breakers at time as intended by the breaker installer. The physical configuration of the present invention is mated to the physical configuration of the breaker box itself. The present frangible cover is designed to mate with the extending finger of the phase line bus bar and engage the tab of the insulating strip as if it were a breaker or plurality of breakers.