According to the NEC, what is the regulation regarding the use of fuses in modern electrical installations?

The regulation concerning the use of fuses in modern electrical installations emphasizes that while fuses have historically been a common means of overcurrent protection, the National Electrical Code (NEC) favors the use of circuit breakers in most situations. The primary reason for this preference is related to safety, convenience, and the growing complexity of modern electrical systems.

Circuit breakers can be reset after a trip, allowing for easier maintenance and reducing downtime, while fuses require replacement once blown, which can lead to added inconvenience and potential safety risks if fuses are not readily available or improperly rated. The NEC also encourages the use of circuit breakers due to advancements in technology and the availability of devices that provide better functionality, such as ground fault protection and surge protection. Therefore, the regulation clearly states that fuses must be replaced with breakers and cannot serve as a substitute for circuit breakers in modern installations, underscoring the shift toward greater safety and efficiency in electrical design.