According to federal regulations, how quickly must live parts contain fewer than 60 VDC or 30 VAC once the connector is separated from mating components?

• A. Within five seconds
• B. Within one minute
• C. Within one second
• D. Within ten seconds

Answer: (C)

When handling electrical connections, the immediate danger after separation is the potential for residual voltage or stored energy to keep parts energized. Federal regulations set a clear safety boundary: the voltage on exposed live parts must drop to below 60 V DC or 30 V AC within one second after the connector is separated from its mating components.

This rapid drop matters because energy can linger in capacitances, wiring, and other circuit elements even after disconnection, posing a shock or arc flash risk. The one-second limit minimizes the time a worker is exposed to dangerous voltage, helping prevent injury. The other time frames—five seconds, ten seconds, or a minute—would allow dangerous energy to persist too long, increasing the likelihood of harm.