Besides, such passports should include maps of placement of high-voltage substations' systems of protective grounding which play a key role to guarantee safety operation of personnel and equipment.
By using maps of EF and MF strength distributions at PTL and high-voltage substations operation obtained as a result of measurements and calculations of the EF and MF strength as well as by using reliable maps of the protective grounding systems, plans of the safety movement of the high-voltage substations' technical personnel and placement of equipment especially sensitive for possible electromagnetic exposures will be prepared.
External protective grounding
is required to provide a low ohm contact with the "ground" in most cases.
Some examples of events that cause single fault conditions are interruption of protective grounding
or one supply conductor, external voltages on data ports, and failure of an electrical component.
Within each enclosure, a series of ground studs are placed to provide adequate means for protective grounding
. In addition, split rear doors help maximize floor space.