activated, it generates an electric impulse which travels
through the firing wire and cap lead wires to fire the
If M60 igniter fails to function, it can
electric blasting cap. Initiation of the cap detonates the
be reset quickly without disassembly
explosive charge into which the cap has been inserted.
by pushing plunger all the way in
and firing as before. If igniter still
fails to function, replace with
a. M60 Fuse Igniter.
(1) Remove safety pin.
(2) Push plunger all the way in.
(3) Turn release ring 1/4 turn and pull.
(4) Note time of ignition.
Figure 5-7. Electric firing system.
(5) Retire to safe
SAFETY PRECAUTIONS FOR ELECTRIC
expected time detonation.
b. Time Blasting Fuse Igniter M2. To fire, hold
The general safety requirements in Chapter 2
barrel in one hand and pull on pull ring with other hand.
will be followed during all operations using an electric
firing system. A possibility exists that electric systems
may be energized to dangerous levels from outside
c. Lighting Time Blasting Fuse with a Match. If a
sources such as static electricity, induced electric
fuse igniter is not available, light the time blasting fuse
currents, radar, radio communication equipment, high
with a match by splitting the fuse at the end (fig. 5-3),
tension wires, etc. The following precautions will be
placing the head of an unlighted match in the powder
taken to reduce the possibility of premature initiation of
train, and then light the inserted match head with a
electric blasting caps.
flaming match or by rubbing the abrasive on the match
box against it.
a. Electric blasting caps will be connected to the
firing circuit before connection to the demolition charge.
5-6. ELECTRIC FIRING SYSTEMS
This procedure will minimize injury and damage should
an electric blasting cap prematurely detonate.
BLASTING CAPS DO NOT HOLD THE
b. Minimum distances between transmitters and
EXPLOSIVE END OF THE CAP, HOLD
electro-explosive devices will be in accordance with TM
THE END OF THE CAP WHICH IS
9-1300-206 and DARCOM-R 385-100.
CONNECTED TO THE LEAD WIRES.
c. Blasting caps less than the equivalent of
The electric firing system (fig. 5-7) consists of
commercial No. 8 will not be used.
an electric blasting machine, a firing wire, and an
electric blasting cap. When the blasting machine is