When an ungrounded system supplies separate buildings by a feeder, which requirements apply?

In an ungrounded system that supplies separate buildings via a feeder, both grounding and bonding requirements are essential. Grounding refers to the connection of electrical systems to the earth, which helps to stabilize voltage levels and provides a path for fault currents, enhancing safety by preventing electrical shock hazards. Bonding, on the other hand, is about connecting various conductive parts to ensure that they maintain the same electrical potential, reducing the risk of shock and ensuring that if a fault occurs, it is effectively cleared.

When supplying power to separate buildings, it is critical that both grounding and bonding practices are observed. This ensures that each building system is properly grounded to prevent the buildup of voltages that could be dangerous and that all conductive elements within each facility are bonded to avoid potential differences that might lead to shocks. Additionally, the National Electrical Code (NEC) specifies that both grounding and bonding methods must be implemented to enhance the safety and functionality of electrical systems in multiple building environments.

Thus, recognizing the importance of both aspects in this context highlights that it is not sufficient to focus solely on either grounding or bonding; both are necessary to ensure a comprehensive safety framework for electrical systems in separate buildings.