ELECTRIC FIRING SYSTEMS

TM 9-1300-277

activated, it generates an electric impulse which travels

NOTE

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

serviceable igniter.

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

distance

and

figure

5-7.

SAFETY PRECAUTIONS FOR ELECTRIC

expected time detonation.

SYSTEMS

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.

WARNING

WHEN

HANDLING

ELECTRIC

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

Change 2

5-6