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Electric
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TM-9-1300-277 Demilitarization/Disposal of Conventional Munitions Manual
Next
Shunt firing wire
TM 9-1300-277
or nonmetallic tool. Avoid accidental digging into the
WARNING
charge. When the earth has been removed within one
UPON REACHING THE MISFIRED
foot, place a new 1 to 1-1/2 kilograms (2 to 3 pounds)
CHARGE,  IMMEDIATELY  REMOVE
charge over the failed charge and prime as before.
THE
FAILED
DETONATOR/
INITIATOR.
5-27. PREVENTION OF ELECTRIC MISFIRES
All safety precautions will be followed.  In
(2) Insert  a  new  fused  detonator/
addition, the probability of a misfire may be reduced if
initiator into the charge. Destroy the failed components
the following procedures are adhered to:
by placing them along side the newly primed charge. If
this is not practical, place a new charge next to the
a. Ensure use of proper blasting cap.
misfired charge and prime as required.
b. All blasting caps are included in firing circuit.
b. Detonating Cord Misfire.
c. All connections between blasting cap wires,
(1) Allow a minimum of 30 minutes
connecting wires, and firing wires are properly made.
after expected detonation before starting investigation,
except if initiating blasting cap is electric.
d. Short circuits and grounds are avoided.
WARNING
UPON REACHING THE MISFIRED
e. The number of blasting caps in any circuit does
CHARGE,  IMMEDIATELY  REMOVE
not exceed the rated capacity of blasting machine being
THE  MALFUNCTIONED  BLASTING
used.
CAP  FROM  THE  DETONATING
CORD.
f. A dual electric firing system should be used or
all charges should be dual primed.
(2) Attach a new initiating blasting cap
to detonating cord, taking care to fasten properly. Place
5-28. HANDLING ELECTRIC MISFIRES
failed blasting cap on or near the newly primed charge
to ensure destruction.
Electric misfires will be handled as follows:
(3) If detonating cord still fails, remove
WARNING
earth cover and reprime explosive charge with new
WAIT AT LEAST 30 MINUTES AFTER
detonating cord. Failed detonating cord will be disposed
EXPECTED
DETONATION
OR
of by placing in the pit. Replace earth cover.
IGNITION BEFORE APPROACHING
ANY  MISFIRE.
IF  IT  CAN  BE
POSITIVELY  ASCERTAINED  THAT
c. Explosive Charge Misfire. After determining in
accordance with paragraphs a and b above that blasting
THE
FAILURE
IS
STRICTLY
cap and/or detonating cord are satisfactory, replace
ELECTRICAL IN NATURE, AND IT IS
failed explosive charge as follows:
POSITIVELY  KNOWN  THAT  THE
EXPLOSIVES ARE NOT BURNING,
CORRECTIVE  ACTION  MAY  BE
(1) Allow a minimum of 30 minutes after
TAKEN IMMEDIATELY.
expected  detonation  before  starting  investigation,
except if initiating blasting cap is electric and if it is
positively known that the charge is not burning.
a. Check  firing  wire  connections  to  blasting
machine terminals to be sure that contacts are good.
(2) Replace charge as follows:
b. Make two or three more attempts to fire the
circuits.
(a) If failed charge has not been buried,
place a new charge (counter-charge) at the side of the
failed charge and prime as before.
c. Disconnect blasting machine and check firing
wire for continuity. If continuity exists, attempt to fire
again using another blasting machine. If con-
(b) If failed charge has been covered
with earth, carefully remove earth cover with a wooden
Change 2
5-23

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