What type of phase power is required for the rooftop units and make-up-air unit on the Wendy's restaurant?

For rooftop units and make-up air units in commercial settings like a Wendy's restaurant, three-phase power is commonly required. This type of power provides a more efficient and stable supply, which is essential for the operation of larger equipment such as heating, ventilation, and air conditioning (HVAC) systems.

Three-phase power has several advantages, including being able to deliver more power with less wire, allowing for smaller conductor sizes, and providing a power supply that promotes smoother operation of motors. This makes it particularly well-suited for HVAC systems that have high starting and operational demands.

Single-phase power, while it can be adequate for smaller systems and residential applications, does not provide the necessary energy efficiency and is not typically used for commercial rooftop HVAC systems. Two-phase systems are largely obsolete and not standard in modern electrical installations. Four-phase systems are not commonly referenced in standard electrical applications.

Thus, three-phase power is the optimal and most standard choice for the electrical needs of equipment such as rooftop units and make-up air units in commercial establishments.