Which of the following indicates a dedicated oil heating system circuit?

A dedicated oil heating system circuit is one that serves exclusively the oil heating equipment, ensuring that there is no interference or overload from other electrical devices. This kind of circuit is essential for optimal performance, safety, and reliability of the oil heating system.

Using a dedicated circuit minimizes the risk of system failures that can occur if multiple devices are sharing the same electrical path. It also ensures that enough power is available for the oil heating system to function without interruptions, which can be critical during peak demand times or extreme weather conditions. This dedicated approach aligns with best practices in electrical safety and system design, making it clear why this option is the correct choice.