Supplementary overcurrent protection _____.

• A. May be used to protect internal circuits of equipment
• B. Must be used for all circuits
• C. Cannot be used with equipment
• D. Is limited to outdoor circuits

Answer: (A)

Supplementary overcurrent protection is an extra protective device placed in or near equipment to protect its internal conductors from overcurrent, separate from the main protection that covers the feeders. This allows selective protection of internal circuits within equipment such as control panels or motor assemblies, when the design calls for additional protection beyond the primary OCPD. Because of that role, it may be used to protect internal circuits of equipment. It’s not required for every circuit, it’s not prohibited to use with equipment, and it isn’t limited to outdoor circuits; its use is determined by the equipment design and listing requirements.