If trolley wires have a ground return, is it permitted to connect circuits for lighting and power from railway conductors?

The correct answer is that it is permitted to connect circuits for lighting and power from railway conductors if trolley wires have a ground return. This allowance is based on specific provisions outlined in the National Electrical Code (NEC) that govern the use of railway conductors and their connections to other circuits.

In systems where trolley wires are utilized, the electrical characteristics of the system, including the proper grounding and return paths, enable these conductors to be safely used for additional circuits like lighting and power. The assurance of a ground return means there is a reliable and safe path for the return current, which mitigates potential hazards associated with electrical connections.

The NEC recognizes the functionality and integration of these systems, ensuring that connecting circuits is done safely and within regulatory standards. This fosters efficient use of infrastructure while maintaining the electrical integrity and safety necessary for both railway operations and additional electrical services.

Considering other options, prohibiting connections would unnecessarily limit the effective use of existing infrastructure. Specifying connections only for emergency lighting or only for temporary installations would restrict scenarios where the connections can be beneficial and safe, thereby undermining the efficient operational potential of the trolley system.