29.F.15 Springing boreholes.
- A borehole must never be sprung when it is adjacent to or near a hole that is loaded.
- Flashlight batteries must never be used as a power source to replace a blasting machine when springing boreholes.
Detonating cord must be handled and used with the same respect and care given other explosives.
29.F.16 Use of detonating cord.
- Detonating cord must be handled and used with the same respect and care given other explosives. Care must be made to avoid damaging or severing cord during and after loading and hooking-up.
- When using a detonating cord down line, after the primer is loaded in the hole, the detonating cord must be cut from the supply reel before loading the rest of the charge.
- Detonating cord connections must be positive in accordance with recommended methods. Knot or other cord-to-cord connections must be made only with detonating cord in which the explosive core is dry.
- All detonating cord trunk lines and branch lines must be free of loops, sharp kinks, or angles that direct the cord back toward the oncoming line of detonation.
- When connecting a detonator to detonating cord, the detonators must be taped or otherwise attached securely along the side or the end of the detonating cord, with the end of the detonator containing the explosive charge pointing in the direction in which the detonation is to proceed.
- Detonators for firing the trunk line must not be brought to the loading area nor attached to the detonating cord until everything else is in ready for the blast.
29.F.17 The blaster must keep an accurate, up-to-date record of explosives, blasting agents, and blasting supplies used in a blast.
29.F.18 Loaded holes must be stemmed to the collar with non-combustible material.
29.F.19 All loaded holes or charges must be checked and located and all detonating cord connections must be inspected before firing the blast.
29.F.20 All charges must be covered with blasting mats or back covered before firing where blasting may cause injury or damage by flying rock or debris. Where mats are used, care must be taken to protect electric blasting circuits.
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29-9. What is required when using detonating cord?
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