What is typically used to establish a new voltage level and isolate part of the power distribution system?

The correct choice is associated with establishing a new voltage level and isolating part of the power distribution system. A separately derived system is specifically designed for this purpose. It refers to a power system that originates from a transformer, generator, or inverter that is electrically isolated from other systems. This type of system allows for the creation of a new voltage level that does not directly connect to the rest of the electrical distribution system, providing both voltage transformation and electrical isolation.

By utilizing a separately derived system, safety and grounding considerations can be effectively managed, especially in scenarios where different voltage levels are necessary or where electrical isolation is required for safety and operational purposes. This system ensures that any faults or disturbances in one part of the power distribution network do not adversely affect other parts, promoting overall system reliability and safety.