Why should pigtail connections in a single row blasting pattern be maintained at 90 degrees?

• A. To enhance the connectivity of all lines
• B. To ensure flexibility during detonation
• C. To prevent cut-off holes
• D. To allow easier maintenance access

Answer: (C)

Maintaining pigtail connections at a 90-degree angle in a single row blasting pattern is crucial for preventing cut-off holes. A cut-off hole occurs when the detonating signal is not properly transmitted to one or more of the blasting charges, which can lead to unreliable detonation patterns and increase the risk of misfire or incomplete blasting.

When pigtail connections are made at a right angle, it ensures that the wiring does not bunch up or twist, which could interfere with the signal integrity. This configuration allows for proper function and alignment of the blasting circuit, reducing the risk of any disruptions in the detonation sequence. Overall, adhering to a 90-degree angle is an important practice for safe and effective blasting operations.