Figure 7-2. Equipotential grounding is the most effective way of protecting employees

DOE-HDBK-1092-2004

Figure 7-2. Equipotential grounding is the most effective way of protecting employees

who are working on high-voltage systems and equipment.

7.5.1.1 REDUCE THE POTENTIAL VOLTAGE DIFFERENCES ACROSS THE WORKER

The primary function of personal protective grounds is to provide maximum safety for personnel

while they are working on deenergized lines or equipment. This will be accomplished by making

provisions that will reduce the potential voltage differences at the work site (voltage differences

across the worker) to a safe value in the event that line or equipment being worked on is

accidentally reenergized, voltages induced from other energized lines, an energized line falls on

the line being worked, or there is a lightning strike near the line being worked.

The personal protective grounds should provide a low-impedance path to ground to ensure

prompt operation of the circuit protective devices.

7.5.2

APPLICATION

Certain methods and steps should be exercised when placing grounds and loads to protect

workers from high-voltage hazards.

7.5.2.1 DEENERGIZED LINES

When an energized line or equipment in excess of 600 V is removed from service to be worked

on, it shall be treated as energized until it is deenergized, tagged, locked if necessary, tested,

and grounded.

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