How many feet of detonating cord should be left out of a hole?

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Prepare for the California Blasters Test. Use flashcards and multiple choice questions, with hints and explanations. Get exam-ready today!

Multiple Choice

How many feet of detonating cord should be left out of a hole?

Explanation:
Three feet of detonating cord left out of the hole is the standard practice because you need enough slack outside the borehole to reach and connect to the surface initiation device safely, while keeping the end from being pulled back into the hole. This length provides a practical handle for tying, inspecting, and securing the cord without it slipping deeper or getting damaged. If you leave only a small amount, you may not reach the surface initiator or have enough cord to make a reliable connection. If you extend much longer, it adds unnecessary clutter and potential hazards at the blast site.

Three feet of detonating cord left out of the hole is the standard practice because you need enough slack outside the borehole to reach and connect to the surface initiation device safely, while keeping the end from being pulled back into the hole. This length provides a practical handle for tying, inspecting, and securing the cord without it slipping deeper or getting damaged. If you leave only a small amount, you may not reach the surface initiator or have enough cord to make a reliable connection. If you extend much longer, it adds unnecessary clutter and potential hazards at the blast site.

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