When replacing a fuse with one of a ampere higher rating than the original, which of the following is true?

Correct Answer: Option B — It endangers the apparatus it is supposed to protect.

Over-fusing violates 46 CFR Subchapter J requirements for circuit protection. A fuse must be sized to protect the conductor's ampacity. Installing a higher-rated fuse allows excessive current to flow during a fault, which can cause cable insulation failure, fire, or permanent damage to the connected electrical apparatus.