What is the minimum working clearance required at a 277/480-volt panel?

The minimum working clearance required at a 277/480-volt panel is 3.5 feet. This distance is established to ensure safe access and to provide sufficient space for electrical workers to operate safely around energized equipment. Maintaining a proper working clearance is essential to reduce the risk of accidental contact with live components, which can lead to electrical shock or arc flash incidents.

The National Electrical Code (NEC) lays out specific requirements for working clearances based on the system voltage and equipment design. For voltages at 277/480 volts, the specified working clearance reduces the potential hazards associated with maintenance or inspection activities.

A clearance of 3.5 feet is designed to allow safe operation while performing tasks such as troubleshooting, replacing breakers, or maintaining the electrical panel. Adhering to this standard reflects a commitment to safety protocols in electrical work environments.