This standard describes installation and maintenance procedures for panelboards, and special procedures used after adverse operating conditions such as a short-circuit, ground-fault, or immersion in water. This standard applies to panelboards rated 600 Volts (AC and DC) or less, with main disconnects or lugs, and with feeder or branch circuit overcurrent devices.

This publication applies to single panelboards and multi-section panelboards that are installed in the field and used for distributing power for commercial, institutional, and industrial loads in nonhazardous locations both indoors and outdoors.

This publication does not apply to panelboards that are factory-installed as part of a Listed enclosure or assembly, live-front panelboards, or panelboards employing cast enclosures for hazardous or special service conditions.