When there are not enough nonelectric blasting caps available, detonating cord may be used to initiate the priming
charge. The priming procedures will vary depending on the explosive charge used.
Demolition Block Charges. Demolition blocks (TNT) can be primed with detonating cord in several ways,
as shown in Figure 1-36.
The most reliable method is to affix a nonelectric blasting cap to the end of the detonating cord, then place it in
the demolition block in the same way as for nonelectric priming.
Another method is to lay one end of a four-foot length of detonating cord at an angle across the explosive. Wrap
the running end around the block three times, and lay the end at an angle. On the fourth wrap, slip the running
end under all the wraps parallel to the other end, and draw it tight.
Figure 1-36. Detonating cord priming of demolition blocks.
Alternate method number one is to tie the detonating cord around the explosive block (on top of the booster, if
one is present) using a clove hitch and two extra turns. Fit the cord snugly against the blocks, and push the loops
close together.
Alternate method number two is to hold a loop of detonating cord on the explosive with four wraps around the
block and loop. Ensure that the first wrap goes over the short leg of the loop. Pull the running end through the
eye of the loop and tighten it. Note that this method is more applicable to short detonating cord branch lines or
primers than to long ones.
Alternate method number three is to tie a Uli knot with a minimum of eight wraps using a 20- to 24-inch length of
detonating cord. This knot equals the power output of three to four blasting caps. Tape the knot tightly to the
demolition charge to be detonated.
Plastic Explosives. To prime plastic explosives (such as C-4) with detonating cord, form one of the three
knots shown in Figure 1-37.
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