Code Standards and Practices Level 6 Practice Test

Coordinating SCCR, OCPDs, and circuit parameters to limit damage during a short-circuit is about making sure the protection in a motor circuit is strong enough to handle a fault without allowing damage to spread, while the protective device trips quickly enough to stop the fault. The NEC addresses this for motor circuits in the Short-Circuit and Ground-Fault Protection of Motors section. It requires selecting the motor’s SCCR so it matches or exceeds the available fault current and choosing and coordinating the protective device so that it interrupts the fault in a time frame that minimizes damage to the motor and wiring. This focus on motor protection and fault current coordination is why that section is the best reference for the described intent.

Other sections cover different installation and protection topics that don’t specifically mandate this level of coordination for motors, so they don’t address the same short-circuit protection concept as directly.