Fuses shall not be stored underground longer than how many hours unless the storage place is safe and dry?

• A. 24 hours
• B. 48 hours
• C. 72 hours
• D. 96 hours

Answer: (C)

Fuses are moisture-sensitive, and underground environments can be damp and variable in humidity. To minimize the risk of moisture damage and degradation that could affect performance, there is a safety limit on how long fuses can be stored underground unless you can ensure the storage area is safe and dry. The established limit is 72 hours. This means, without a dry, safe storage area, you should not store fuses underground for more than three days. If the storage space is truly safe and dry, longer storage could be permissible, but the question’s condition emphasizes the 72-hour cap when conditions aren’t guaranteed dry. The other options either impose stricter limits or exceed the typical unsafe-condition limit and don’t align with the standard guideline.