Generator is considered as the most critical equipment for Data Center because it generates power and supply to the load when utility fails.
Transformer is a starting point of supply utility power into the building. Its main job is to transform voltage coming in from utility and supply to the building or load. When selecting type of transformer, designer must choose appropriate type and quality of transformer because it is one of the key to reliability.
All switchgears and cabinets the main control of power distribution of building after taking power from generator or utility. These equipment would supply power to all equipment in the facility and must be maintained regularly.