What type of circuit consists of at least two ungrounded conductors?

A branch circuit that is identified as multiwire consists of at least two ungrounded conductors, which are typically used to supply power to more than one device or outlet. This setup allows the conductors to share a neutral conductor, maximizing efficiency and helping to balance loads across the circuit.

In contrast, a general-purpose branch circuit usually has a single ungrounded conductor which powers multiple outlets or devices, but does not involve the complexity of multiwire configurations. An individual branch circuit is dedicated to a single load or appliance. This type of circuit also typically includes only one ungrounded conductor. Lastly, a branch circuit that is intended for a specific appliance is designed to provide power to one appliance and, similar to the individual type, consists of one ungrounded conductor along with an appropriate rating based on the appliance's requirements.

Therefore, the multiwire branch circuit is specifically designed with the concept of at least two ungrounded conductors, making it unique in its purpose and design compared to the other options presented.