NCCER Electrical Certification Practice Test

In a subpanel, the neutral bus is isolated from the ground bus to ensure proper electrical system safety and functionality. This isolation prevents neutral current from being present on the grounding system, which could pose a shock hazard. By keeping the neutral and ground separate in a subpanel, you ensure that only ground faults will return to the ground bus, while the neutral will carry the return current back to the main panel. This design helps maintain the integrity of the grounding system and reduces the risk of electrical shock or fire from stray currents. Properly isolating the neutral also adheres to electrical codes and standards, which are critical for safe installations.