Let’s kick off this article with a definition of what “MAD” means in the utility sector – and it does not mean that we’re upset with you. The word is actually an acronym that stands for minimum approach distance, which is the calculated safe working distance that provides worker protection when working on or in the vicinity of energized lines and equipment.
As with other articles in this series, we must begin with the hazard. Remember, if you always begin by identifying the hazard, then the application of the OSHA standard becomes somewhat simplified. The hazard here is electricity that could result in electric shock or electrocution. Considering the consequences of the hazard, de-energization should remain the best safe work practice. When de-energization is not feasible, the hazard must be effectively controlled to provide a safe work environment. MAD has been developed to give workers a calculated safe working distance that will provide personal safety and operational security during energized line maintenance or while working in the vicinity of other energized lines. OSHA refers to MAD as “the closest distance a qualified employee may approach an energized conductor or object.”