In which situation can capped safety fuse and Nonels be safer than electric blasting?

• A. When working underground
• B. When electrical hazards are present
• C. When using regular blasting caps
• D. When high temperatures are involved

Answer: (B)

The correct choice highlights the advantage of using capped safety fuses and Nonel (Non-Electric Blasting) systems in the presence of electrical hazards. Electric blasting can pose significant risks when there are stray currents, faulty wiring, or sources of ignition that could inadvertently trigger an explosion. Capped safety fuses and Nonels, which rely on mechanical or chemical means to initiate blasting, eliminate the risk of accidental detonation due to electrical interference.

In environments with potential electrical hazards, the use of non-electric systems enhances safety because it removes the reliance on electric current, which could interact with the surrounding electrical installations or external energizing sources. This makes Nonel systems particularly useful in environments such as mines or construction sites where electrical equipment and systems are prevalent.

Other situations mentioned in the options, like working underground or high temperatures, do not specifically relate to the same level of risk associated with electrical hazards. While those conditions may warrant considerations of specific safety measures, they do not directly relate to issues that would make non-electric systems categorically safer than electric blasting systems.