What type of fuse shall be used in mines?

• A. Standard fuse
• B. Electric fuse
• C. Nitrate fuse
• D. Nonstandard fuse

Answer: (A)

The situation hinges on using a fuse that is reliable, standardized, and designed for safe blasting operations in mines. A standard fuse, often called a safety fuse, is manufactured to strict specifications with a known burn rate and robust construction to withstand the mining environment. This standardization ensures predictable timing for ignition when used with blasting caps, minimizes the risk of premature or failed initiation, and complies with safety regulations.

Electric fuses are meant to protect electrical circuits, not to reliably ignite blasting charges in the field, and can introduce timing or electrical hazards in blasting scenarios. Nitrate fuses are outdated and can be highly sensitive to moisture and degradation, leading to unpredictable performance. Nonstandard fuses lack tested reliability and safety compliance, making them unsuitable for mine use. Therefore, the correct choice is the standard fuse.