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PRELIMINARY ELECTRICAL TESTING
Up
TM-9-1300-277 Demilitarization/Disposal of Conventional Munitions Manual
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CONNECTING/SPLICING ELECTRIC WIRES
TM 9-1300-277
BLASTING CAP BY GRASPINC THE
FIRING WIRE.
(4) Remove shunt.
(5) Hold one cap lead wire to one post
of galvanometer and touch other lead wire to other post.
(6) If cap is satisfactory, galvanometer
needle will deflect slightly less than it did when the
instrument was tested.
(7) Dispose  of  defective
caps
by
placing with material being detonated.
WARNING
CARE
MUST
BE
TAKEN
TO
PROTECT BLASTING CAPS FROM
BEING STRUCK OR COMPRESSED
BY OVERBURDEN THAT IS PLACED
ON
THE
MUNITIONS
OR
Figure 5-8. Testing the galvanometer.
EXPLOSIVES BEING READIED FOR
DISPOSAL.
DO  NOT  PLACE
WARNING
DEFECTIVE CAPS TOO CLOSE TO
HEN  UNCOILING  CAP  LEAD
W
THE MAIN DETONATING CHARGE.
WIRES, THE CAP WILL NOT BE
HELD DIRECTLY IN THE HAND, BUT
(8) Shunt  lead  wires  of  all  caps
WILL BE HELD BY THE WIRES
immediately after testing.  Wires will remain shunted
APPROXIMATELY 2.5 CENTIMETERS
until connection to firing circuit.
(1 INCH) FROM THE CAP.
c. Firing Wire. The firing wire may be tested on
LEAD
.
WIRES
WILL
BE
the reel, but must be retested after unreeling as
STRAIGHTENED OUT BY HAND. DO
uncoiling may separate broken wires. Firing wire will be
NOT THROW, WAVE, OR SNAP TO
tested as follows:
LOOSEN COILS.
(1) Separate firing wire at both ends.
(2) Carefully extend cap lead wires to
Touch wires at one end to galvanometer posts.  The
maximum length.
needle should not move. If needle moves, there is a
short circuit in firing wire. Locate and repair as required.
(3) Secure cap to prevent movement
by placing in a hole or behind a barricade.
(2) Shunt wires together at one end and
touch those at other end to galvanometer posts. This
WARNING
should cause a wide deflection of needle.
No
AN  INDIVIDUAL  REMOVING  THE
movement of the needle indicates a break in firing wire.
SHUNT WILL GROUND HIMSELF TO
A slight movement indicates a point of high resistance
PREVENT ACCUMULATED STATIC
which could be caused by several strands of multi-
ELECTRICITY FROM FIRING THE
stranded wire being broken or by wires not being clean.
Locate defect and repair as required.
Change 1
5-8

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