Power systems used in commercial or industrial buildings are critical to the needs of those who work in and benefit from these establishments. To ensure the proper function of a power system in both normal and unusual circumstances, building owners may request a power system study, also referred to as a power system analysis.

It depends on the equipment and the workplace environment. The harsher the environment, the higher potential for damage, so the more frequently items should be tested. Some businesses have a variety of environments, so testing frequency will vary, from three months to five years.