You can replace a fuse with a higher current capacity fuse.

You can replace a fuse with a higher current capacity fuse.

• A. True
• B. False
• C. Only with supervisor approval
• D. Depends on fuse type

Answer: (B)

Fuses are chosen to protect conductors and equipment by interrupting current when it exceeds what the wiring and devices can safely carry. Replacing a fuse with one that has a higher current rating removes that protection, so a fault current may continue to flow, causing overheating, insulation damage, or a fire. So, it’s not safe or code-compliant to substitute a higher-rated fuse. You should replace with the same amperage rating, same voltage rating, and the same time-current characteristics as the original. Supervisor approval doesn’t make it acceptable, and the fuse type doesn’t justify increasing the rating—the rating is what controls protection.

Fuses are chosen to protect conductors and equipment by interrupting current when it exceeds what the wiring and devices can safely carry. Replacing a fuse with one that has a higher current rating removes that protection, so a fault current may continue to flow, causing overheating, insulation damage, or a fire. So, it’s not safe or code-compliant to substitute a higher-rated fuse. You should replace with the same amperage rating, same voltage rating, and the same time-current characteristics as the original. Supervisor approval doesn’t make it acceptable, and the fuse type doesn’t justify increasing the rating—the rating is what controls protection.