It is a study of the ohmic resistance of the grounding systems and lightning rods that exist in a facility, to verify that these systems are complying with the values ​​requested by the Official Mexican Standard issued by the Ministry of Labor and Social Welfare, NOM-022-STPS-2015, Static electricity in workplaces-Safety conditions. Esta norma solicita que al menos at least once a year and that grounding systems and lightning rods be reviewed, in order to prevent the risks of static electricity, as well as atmospheric electrical discharges.