Where interconnected electric power production sources are connected on the load side, equipment containing ___ devices in circuits supplying power to a busbar or conductor supplied from multiple sources shall be marked to indicate the presence of all sources.

Where interconnected electric power production sources are connected on the load side, equipment containing ___ devices in circuits supplying power to a busbar or conductor supplied from multiple sources shall be marked to indicate the presence of all sources.

• A. Electric
• B. Overcurrent
• C. Switching
• D. Wiring

Answer: (B)

When multiple power sources can energize the same load path, any equipment that contains overcurrent protection devices in the circuits feeding that common bus or conductor must be marked to show that all sources are present. The purpose of labeling these overcurrent devices is to warn workers that more than one source could be supplying the circuit, so a safe, full de-energization and isolation must be performed before maintenance. This helps prevent backfeed and accidental energization from another source that might be assumed to be off. The mark is specifically about overcurrent protection devices (like fuses or breakers) because they are the points of control for the different sources feeding the bus. Other terms like electric devices, switching devices, or wiring are not the precise focus of this requirement.

When multiple power sources can energize the same load path, any equipment that contains overcurrent protection devices in the circuits feeding that common bus or conductor must be marked to show that all sources are present. The purpose of labeling these overcurrent devices is to warn workers that more than one source could be supplying the circuit, so a safe, full de-energization and isolation must be performed before maintenance. This helps prevent backfeed and accidental energization from another source that might be assumed to be off.

The mark is specifically about overcurrent protection devices (like fuses or breakers) because they are the points of control for the different sources feeding the bus. Other terms like electric devices, switching devices, or wiring are not the precise focus of this requirement.