Multiwire branch circuits are designed to do what?

Multiwire branch circuits are designed to supply line-to-neutral loads effectively. These circuits consist of two or more hot wires (often from different phases) that share a neutral conductor, allowing for more efficient usage of the available power. By having two hot wires, the circuit can provide 240 volts for appliances that need higher voltage while also being able to supply 120 volts to standard line-to-neutral loads.

The context of why the other options do not hold true can help clarify the functionality of multiwire branch circuits. For instance, supplying only line-to-ground loads isn't correct because the circuit setup is primarily focused on the provision of voltage to devices that connect between line and neutral, not just those needing a connection to ground. The statement about supplying only line-to-neutral loads oversimplifies the fact that multiwire circuits can handle both higher voltage loads and standard single-voltage loads, emphasizing their versatility. Lastly, the idea of supplying only ground-to-neutral loads ignores the essential operational aspects of multiwire circuits, as these circuits are not designed for that specific load connection. Thus, recognizing that multiwire branch circuits can cater primarily to line-to-neutral loads is essential in understanding their design and purpose.