What should be done at all critical points in an electrical system?

In electrical systems, conducting fault-current calculations at critical points is essential for ensuring the safety and reliability of the system. Fault-current calculations help determine the maximum current that can flow during a fault condition, such as a short circuit. This information is crucial for selecting the appropriate protective devices, such as circuit breakers and fuses, ensuring that they can interrupt the fault current without failing.

By knowing the fault current levels, engineers and technicians can also design the system to minimize the risk of equipment damage, electrical fires, and hazards to personnel, ensuring compliance with safety standards. Therefore, performing fault-current calculations at critical points is a vital practice in maintaining system integrity and safety.

While surge protectors, insulation resistance testing, and overcurrent protection devices are important components of electrical system design and maintenance, they do not directly address the immediate need for understanding the fault current behavior at critical junctures in the system.