Fuses shall be plainly marked with which of the following?

Fuses are critical safety devices used in electrical systems to protect circuits from overcurrent conditions. Proper markings are essential to ensure that users can select and replace fuses safely and correctly.

The correct answer indicates that fuses must be marked with the ampere rating, voltage rating, and interrupting rating, especially when the interrupting rating exceeds 10,000 amperes. The ampere rating indicates the maximum current that the fuse can handle before it blows. The voltage rating specifies the maximum voltage under which the fuse can safely operate. The interrupting rating is crucial because it defines the maximum fault current that the fuse can interrupt without causing danger or failure.

Including all these ratings is particularly important for enhancing safety and ensuring compliance with standards and regulations. If a fuse is not marked correctly, it could lead to incorrect replacements, potentially resulting in electrical hazards, damage to equipment, or severe safety issues.

By requiring these comprehensive markings, the electrical industry establishes a standardized approach that contributes to safer electrical installations and practices, thereby minimizing risks associated with electrical overloading and faults.