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ELECTRIC FIRING SYSTEMS
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TM-9-1300-277 Demilitarization/Disposal of Conventional Munitions Manual
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Figure 5-8. Testing the galvanometer
TM 9-1300-277
firing system will not be conducted during sand, dust, or
d. Electric blasting caps of different manufacture
snow storms.  Under such conditions, all electrical
or type will not be used in the same system.
operations will be suspended, cap and lead wires
shunted, and personnel removed from the disposal area.
e. When uncoiling the leads of blasting caps, the
cap will not be held directly in the hand, but will be held
5-8.
PRELIMINARY
ELECTRICAL
CONTINUITY
by the wires approximately 2.5 centimeters (1 inch) from
TESTING
the cap. The lead wires will be straightened out by hand
and not thrown, waved, or snapped to loosen coils.
The galvanometer, blasting caps and firing
wires will be tested prior to the disposal operation in
f. Individuals connecting/testing electric blasting
accordance with the following paragraphs.
caps will make use of available protective cover when
completing the circuit.
The distance between the
WARNING
individual and the blasting cap will be the maximum
PRIOR TO USING GALVANOMETER,
permitted by length of cap leads.  The individual will
ENSURE
THAT
ONLY
THE
keep his back toward the blasting cap when making the
APPROPRIATE SILVER CHLORIDE
connection.
DRY CELL BATTERY IS INSTALLED.
ANY
OTHER
BATTERY
MAY
g. Blasting caps will be tested for continuity with a
PRODUCE  SUFFICIENT  VOLTAGE
galvanometer or .'51 test set prior to connecting to firing
TO DETONATE BLASTING CAPS.
circuit. The shunt will not be removed from the lead
wires of the blasting cap until the moment of testing.
a. Galvanometer. The galvanometer (fig. 5-8) will
be tested prior to use by holding a piece of metal across
h. The individual removing the shunt will ground
its two terminals.  If this does not cause a wide
himself to prevent accumulated static electricity from
deflection of the needle (29 to 25 units), the battery is
firing the blasting cap by grasping the firing wire.
weak and will be replaced.  When used in a cold
Immediately after testing, the lead wires will be shunted
climate, the galvanometer will be protected from
by twisting the bare ends of the wires together. The
freezing by keeping it under clothing and near the body.
wires will remain shunted until connection into the firing
circuit.
b. Blasting Caps.
i. Both ends of the firing wires will be shunted
(1) Each blasting cap to be used in the
except when firing the charge or testing the circuit. The
electric firing system will be individually tested.
connection between blasting caps and the circuit firing
wires will not be made unless the power end of the firing
WARNING
wires is shunted and grounded.
ALWAYS POINT THE EXPLOSIVE
.
END  OF  BLASTING  CAP  AWAY
j. Firing wires will be secured near the point where
FROM THE BODY, OTHER PERSON-
the blasting cap(s) are connected.
NEL, AND EXPLOSIVES.
k. Prior to making connections to the blasting
INDIVIDUALS WILL MAKE USE CF
.
machine, the firing circuit will be tested with a
AVAILABLE  PROTECTIVE  COVER
galvanometer or M51 test set for electrical continuity.
AND KEEP THEIR BACKS TOWARD
THE BLASTING CAP WHEN TESTING
l. The blasting machine or its activating device will
CAPS FOR CONTINUITY WITH A
not be surrendered to the individual designated to fire
GALVANOMETER.  THE DISTANCE
the charge until the supervisor is assured that the area
BETWEEN
INDIVIDUALS
AND
is cleared of personnel, equipment, etc.
BLASTING  CAP  WILL  BE  THE
MAXIMUM PERMITTED BY LENGTH
m. Disposal operations will not be conducted during
OF CAP LEADS.
an electrical storm or when such a storm is approaching.
Additionally, disposal by detonation using an electrical
Change 1
5-7

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