Electrical Code 3 Practice Test

Panelboard labeling and circuit directories are addressed by Article 408. This article covers panelboards and distribution equipment, including requirements for clearly identifying each circuit and maintaining a circuit directory that lists the circuit numbers and what they feed. Having a properly labeled panel and an up-to-date directory helps electricians quickly locate circuits during maintenance or emergencies and keeps the installation compliant with NEC rules. The other articles focus on different topics: grounding and bonding (Article 250), electrical installations for healthcare facilities (Article 517), and Class 2/3 low-voltage circuits (Article 725). Therefore, the labeling and circuit directory requirements for panelboards fall under Article 408.