Which NEC article covers interrupting rating requirements for equipment?

Which NEC article covers interrupting rating requirements for equipment?

• A. 110.9
• B. 240.86
• C. 450.3
• D. 695.1

Answer: (A)

Interrupting rating is the maximum fault current a device can safely interrupt without damage or danger. The NEC calls for equipment to be suitable for the conditions of use and for its ratings to match the system’s fault current. This general requirement is set in Article 110, which covers the overall installation rules for electrical equipment, including how devices must be listed and rated for the conditions they’ll face. Because it establishes that equipment must be properly rated for the available fault current and be appropriately listed, it’s the best-place reference for interrupting rating requirements. Other articles deal with specific devices or protections, but the overarching guidance on ensuring equipment has a proper interrupting rating comes from Article 110.

Interrupting rating is the maximum fault current a device can safely interrupt without damage or danger. The NEC calls for equipment to be suitable for the conditions of use and for its ratings to match the system’s fault current. This general requirement is set in Article 110, which covers the overall installation rules for electrical equipment, including how devices must be listed and rated for the conditions they’ll face. Because it establishes that equipment must be properly rated for the available fault current and be appropriately listed, it’s the best-place reference for interrupting rating requirements. Other articles deal with specific devices or protections, but the overarching guidance on ensuring equipment has a proper interrupting rating comes from Article 110.