What type of electrical power is typically found in commercial buildings?

In commercial buildings, the standard type of electrical power is often three-phase power. This is primarily due to its efficiency in delivering a large amount of energy to operate heavy machinery, HVAC systems, and other high-demand applications typically found in commercial settings. Three-phase power provides a more consistent and reliable power supply, as it allows for a more balanced load across the phases, reducing the risk of outages and fluctuations compared to single-phase systems.

While single-phase power is also present, particularly for smaller appliances and lighting, three-phase is more prevalent in commercial applications that require significant electrical loads. It is designed to handle the demands of various equipment and systems that operate simultaneously without causing overloads.

Alternating current (AC) is indeed used extensively and is a characteristic of both single-phase and three-phase power systems. However, stating that only alternating current is found doesn't specify the more robust three-phase systems that are commonplace in commercial environments. High-voltage power is also utilized in certain applications but is not exclusive to all commercial buildings and may require special considerations for safety and installation.

Thus, the emphasis on three-phase power illustrates its critical role in the efficient operation of commercial facilities, making it the correct answer to reflect the nature of electrical systems typically employed in these settings.