Tap rules for molded-case circuit breakers: adhering to UL® Standard 508A, NEC® Section 409
Learn how to apply multiple branches and multi-wire terminals with circuit breakers in industrial control panels in accordance with Underwriters Laboratories® (UL® ) standard 508A and the National Electrical Code® (NEC® ), National Fire Protection Association (NFPA® 70-2011).
Molded-case circuit breakers are used for the main overcurrent protective device (OCPD) and the main disconnecting means for an industrial control panel, or as a main or feeder application. If branch circuits need to emanate from the main OCPD, this can be accomplished with:
• Power distribution blocks
• Multi-wire terminals
• Standard breaker terminals
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