Which of the following is necessary to ensure proper overcurrent protection?

Proper sizing of protective devices based on load is crucial for ensuring effective overcurrent protection. This practice involves selecting circuit breakers, fuses, or other protective devices that match the specific demand of the electrical circuits they are meant to protect. If the protective device is too large, it may not trip during an overcurrent situation, allowing potential damage to equipment or even creating fire hazards. Conversely, if it is undersized, it may trip frequently, leading to unnecessary interruptions in service.

Correctly sizing these devices takes into account the maximum load, fault current, and the continuous load the circuit will handle. This approach aligns with the principles outlined in codes and standards, ensuring the system operates safely and effectively. By tailoring the protection to the specific requirements of the electrical load, you may prevent damage and enhance safety in the electrical system.