The internal parts of modern current-limiting fuses do not require maintenance. There are no adjustments or settings necessary—or possible. However, like all electrical components, the integrity of fuses can be negatively affected by the surrounding environment and components. That’s why it is important to periodically
check fuse bodies, fuse mountings/ clips and adjacent conductor terminations for signs of overheating, poor connections or insufficient conductor ampacity.
Always have spare fuses of the correct type and ampere rating readily available. For critical circuits, it is best to keep ample spares in a cabinet marked “spare fuses” near the electrical equipment. Also, label the equipment with the proper fuse type and ampere rating. Fuses from different manufacturers should not be mixed in usage since the claims for selective coordination by individual manufacturers are applicable only to their respective products. A continuity tester can verify that a fuse has not opened.
The following safety precautions will prevent injury to personnel and damage to equipment. Theseare the MINIMUM safety precautions for replacing fuses.
Preventive maintenance of fuses consists of checking for the following conditions and correcting any discrepancies.