What length of tubing should a Nonel assembly have when loading a hole?

• A. 5 feet
• B. Sufficient length for a 3-foot pigtail
• C. 10 feet
• D. 12 feet

Answer: (B)

The correct choice regarding the length of tubing for a Nonel assembly when loading a hole is guided by the need for sufficient length to ensure safe and effective operation. In this case, specifying a "3-foot pigtail" means that the tubing should be long enough not only to reach the desired location within the hole but also to allow for the necessary connections and handling during loading.

Using a length that accommodates a 3-foot pigtail ensures that there is enough tubing to maneuver around while also keeping the explosive safely distanced from the loader. This practice minimizes risk and ensures proper placement of the explosive charge. In mining operations, where safety and precision are paramount, adhering to recommended pigtail lengths helps in managing the dynamics of loading and detonation.

The other choices may suggest lengths that do not account for specific operational needs or may not provide enough safety margin in handling the assembly. A careful approach to the length of tubing will help avoid complications during the loading process.