What must be provided when multiple ungrounded conductors originate from the same circuit?

When multiple ungrounded conductors originate from the same circuit, a common neutral conductor must be provided. This is essential to ensure that current evenly distributes among the conductors and provides a return path for the electrical current. The common neutral effectively balances the load, which is crucial for preventing overloads and ensuring the safety of the electrical system. It allows the circuit to operate effectively while providing a safe path for excess current back to the source, thus maintaining system stability.

Using a common neutral conductor is particularly important in multi-wire branch circuits, as it helps to reduce the risk of overheating, enhances the functionality of the circuit, and complies with electrical code requirements. In doing so, it also minimizes the chances of unbalanced loads that can lead to fluctuations in voltage.

The other options pertain to important aspects of electrical safety, but they do not specifically address the need for a return path in circuits with multiple ungrounded conductors. Therefore, while color coding, circuit breakers, or grounding systems have their roles in electrical installations, the provision of a common neutral conductor directly addresses the requirement outlined in the question scenario.