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Final Check of Hookup
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TM-9-1375-213-12-1 Demolition Materials Demolition Kit Cratering: M180 NSN 1375-00-148-7159 and Training: M270 (Inert) NSN
Next
Figured 2-17. Multi-kit hookup, widely spaced.
TM 9-1375-213-12-1
trical impulse, there may be a difference of a few
(4) Kits have not been missed in rocket motor
milliseconds in shaped charge initiation. As a re-
interconnection or in demolition circuit intercon-
sult of this time difference, the blast from the
nection.
shaped charge on one kit could topple another kit
(5) All connections are secure.
before its shaped charge fires if it is closer than
e. Final Procedures At Kit Site.
25 feet (7.5 meters) to its neighboring kit. Refer
(1) Connect firing circuit to field firing lead as
to figure 2-17 for interconnection of rocket mo-
follows:
tors.
WARNING
(1) A multi-kit hookup of widely spaced kits
Before connecting firing circuit to field
differs from a multi-kit hookup of closely spaced
firing lead, have operator in charge as-
kits as follows:
sure that all other personnel are at least
(a) In order to interconnect the electrical
500 feet (150 meters) from nearest kit and
firing circuits for the rocket motors, the firing ca-
under cover (or at least 4000 feet (1200
bles of all kits (except nearest kit) must be ex-
meters) away if no overhead cover is
tended by using additional wire. See c below.
available).
(b) there is no interconnection of demolition
circuits, since each circuit remains independent
(a) Pull protective sheath from end of firing
and is connected to its respective kit only.
lead (A, fig. 2-10).
(2) Instructions in paragraphs 2-3b, 2-4 and
(b) Untwist and separate both bared con-
2-5 above apply to this multi-kit hookup.
ductors (B, fig. 2-10) and assure that conductors
are clean and uncorroded. If corrosion is present,
NOTE
it may be easier to strip insulation from conduc-
The normal order of assembly of demoli-
tors below bared portions than to scrape corrosion
tion circuits has again been varied here
off bared conductors. Each wire must have at
(as with closely spaced kits) to ease the
least two inches of bared conductor.
assembly process.
(c) Splice one conductor of the firing lead to
each conductor of the field firing lead. Make sure
b. Installing Demolition Circuits. Beginning
splices are secure.
with nearest kit, install each demolition circuit in
(d) Insulate each splice with tape to prevent
accordance with the procedures in paragraphs
shorting.
2-6a through 2-6h above.
(2) Remove yellow-tagged safety plug (fig. 1-5)
Interconnection of Rocket Motors.
from each rocket motor after all units are inter-
connected and attached to the shorted firing line.
NOTE
Retain the plugs.
Operator will determine firing circuit
(3) Count yellow-tagged safety plugs to assure
path to be used, and make a sketch of the
that number of removed plugs agrees with num-
path prior to undertaking steps below.
ber of kits to be fired.
(4) Count continuity plugs to assure that
NOTE
number of removed plugs is one fewer than num-
The suggested method of rocket motor
ber of kits to be fired.
interconnection is to have operator begin
(5) Retain all plugs until after firing.
with farthest kit and work toward near-
(6) Take plugs and blasting machine to the
est kit. (The designations of "farthest kit"
firing location.
and "nearest kit," as used here, refer to
(7) Proceed to final preparations (para 2-9).
the position of the kits in relation to the
end of the field firing lead.)
2-8. Multi-Kit Hookup of Widely Spaced Kits
(1) Extend rocket motor firing cable of far-
thest kit as follows:
(2 to 15 Kits)
(a) Cut firing cable in half.
(b) Strip three inches (7.5 cm) of insulation
a. Airfield Pocking. In operations like airfield
from the two conductors (wires) at each cut end
pocking, up to 15 kits may be fired at once by the
of cable.
interkit firing circuit if there is at least 25 feet
(7.5 meters) between kits. This distance is neces-
NOTE
sary to prevent the blast of one kit from interfer-
Use 500-foot (150 meter) reels (using cable
ing with the operation of others. Even though the
reel and reeling machine) of electrical
rockets of all kits are initiated by the same elec-
power cable or type WD-1/TT telephone
Change 2
2-20

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