During the fuse timing procedure, how far apart should the notches be?

• A. 6 inches
• B. 3 feet between notches
• C. 1 foot
• D. 9 inches

Answer: (B)

The timing is based on creating a predictable sequence by evenly spacing the marks along the fuse. When notches are placed at regular intervals, each segment of fuse contributes the same amount of delay, so the total time from initiation to each blast point stays consistent. This uniform spacing is crucial for safety and for coordinating the timing of multiple charges. If the spacing were uneven, some portions would burn longer or shorter than others, throwing off the overall delay and increasing the risk of an unsafe or mis-timed blast. The exact distance between notches is dictated by the specific fuse being used and the procedure you’re following, so always refer to the official blasting safety manual or your instructor for the precise measurement.