A common (shared) neutral may be used for what type of circuits, according to Wendy's specifications?

Using a common (shared) neutral is permissible for lighting branch circuits that are scheduled on different phases. When lighting circuits are wired to different phases of a multi-phase system, the shared neutral can effectively carry the imbalance of the current between the circuits. Since the loads on the two circuits can alternate, for example, if one circuit is drawing power while the other is not, the neutral will ensure that the return path of the current is balanced, reducing potential voltage drops and ensuring system efficiency.

In this scenario, the shared neutral helps to manage the varying electrical loads that can occur in different lighting circuits without compromising safety or functionality. This practice allows for efficient use of wiring infrastructure and can simplify installations in multi-phase systems.

It is also important to recognize that other circuit types, such as dedicated circuits and emergency lighting circuits, typically require their own neutrals to ensure reliability and safety, particularly where consistent load characteristics or critical power supply is necessary.