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NEC Sections 110-9 and 230-65
Section 110-9 - Interrupting Capacity
- Any device used to protect a low voltage system should be capable of opening all fault currents up to the maximum current available at the terminal of the device. It is a direct violation of paragraph 110-9 of the NEC to use circuits above their interrupting rating. By using properly sized Current Limiting Fuses ahead of these devices, the current can usually be limited to a value lower than the interrupting capacity of the over current devices.
Section 230-65 - Available Short Circuit Current -
Similar to 110-9, Emphasizes the importance to have proper interrupting capacity. Service equipment shall be suitable for the short circuit current available at its supply terminals.