Energized work is permitted if conductors and devices are energized at less than what to ground?

Energized work is permitted if conductors and devices are energized at less than what to ground?

• A. 100V
• B. 150V
• C. 50V
• D. 120V

Answer: (C)

Energized work is allowed only when the voltage to ground is very low, because the risk of electric shock and other hazards drops with lower potential differences. The standard threshold used is 50 volts or less to ground. When conductors and devices are energized at under 50 V to ground, a qualified person can perform certain tasks with appropriate PPE and insulating tools, since the chance of a dangerous shock is much reduced. Voltages higher than that, such as 100 V, 120 V, or 150 V, carry a greater shock and arc risk, so de-energizing or additional protective measures are required.

Energized work is allowed only when the voltage to ground is very low, because the risk of electric shock and other hazards drops with lower potential differences. The standard threshold used is 50 volts or less to ground. When conductors and devices are energized at under 50 V to ground, a qualified person can perform certain tasks with appropriate PPE and insulating tools, since the chance of a dangerous shock is much reduced. Voltages higher than that, such as 100 V, 120 V, or 150 V, carry a greater shock and arc risk, so de-energizing or additional protective measures are required.