Conductors other than service conductors should not be installed in what type of service structure?

The correct choice is the service raceway because service raceways are specifically designed to house and protect the service conductors that deliver electricity from the utility to the service equipment. These raceways are intended to accommodate only the conductors that are part of the electrical service, as this ensures safety and compliance with electrical codes.

Including conductors other than service conductors in a service raceway could lead to issues such as overheating, interference, or unintended electrical pathways that may pose a safety hazard. By keeping the raceway dedicated solely to service conductors, it helps maintain proper electrical integrity and reduces the risk of electrical faults or failures. Understanding the specific function of a service raceway emphasizes the importance of adhering strictly to these guidelines to ensure a safe and compliant electrical installation.