Full definition
Mexican standard for maintenance of electrical installations in workplaces. Specifies: work classification (energized vs. de-energized), safe work procedures, required dielectric PPE (insulated gloves, footwear, tools), LOTO application, and safety distances by voltage class (low <1 kV, medium 1-35 kV, high >35 kV). Mandatory for all industrial electrical contractors and maintenance crews performing electrical work.