Disconnects that do not normally carry current are typically kept in which state to prevent unintended energization?

Disconnects that do not normally carry current are typically kept in which state to prevent unintended energization?

• A. Open
• B. Closed
• C. Locked
• D. Interlocked

Answer: (A)

Keeping a disconnect in the open state creates a true electrical break, so no current can flow even if there’s a control signal or a fault elsewhere tries to energize the circuit. This is the safest default for equipment that isn’t carrying current, because it prevents unintended energization. Closing would connect the circuit and allow current to flow. Locking or interlocking are safety mechanisms to control operation, but they don’t by themselves guarantee the device stays de-energized—the open position is what physically prevents energization.

Keeping a disconnect in the open state creates a true electrical break, so no current can flow even if there’s a control signal or a fault elsewhere tries to energize the circuit. This is the safest default for equipment that isn’t carrying current, because it prevents unintended energization. Closing would connect the circuit and allow current to flow. Locking or interlocking are safety mechanisms to control operation, but they don’t by themselves guarantee the device stays de-energized—the open position is what physically prevents energization.