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|  MIL-T-82570A(OS)
3.4.5 Electrical requirements
3.4.5.1 Dielectric strength. Electrical circuitry of the tube shall with-
stand the application of a potential of 1000 volts ac between mutually insu-
lated terminals and ground for one minute minimum without breakdown.
3.4.5.2 Insulation resistance. Immediately following the dielectric
strength test, the insulation resistance between hipotted points in the
barrel circuits shall be 3 megohms minimum when a potential of 500 volts dc
is applied. The insulation resistance between the hipotted points of the
training gear heater circuit shall be 0.5 megohm minimum when a potential
of 500 volts dc is applied.
3.4.5.3 Circuitry. Electrical circuitry shall be in accordance with
NAVSEA Dwg 694627 for Torpedo Tube Mk 32 Mod 5 and NAVSEA Dwg 694631 for
Torpedo Tube Mk 32 Mod 7, as applicable.
*
3.4.5.4 Training gear heater resistance test or current drain. The tor-
pedo tube assembly training gear heater element resistance shall be 6.9 ohms
plus 0.7 ohm or minus 0.4 ohm, or the heater element current drain at 115 volts
plus or minus 0.5 volt ac input shall be 16.7 amps plus 1.1 amps or minus
1.6 amps.
*
3.4.5.5 Barrel heater resistance. The total electrical resistance of the
heater circuit for each barrel shall be 11.4 plus or minus 0.8 ohms.
*
3.4.5.6 Heater circuits operating current. When the electrical heating
circuits of the torpedo tube are operating, the total maximum current drain
shall be 50.5 amperes with an input of 115 plus or minus 0.5 volts ac.
3.4.6 Squib fire switches. The switch plunger shall move out forcefully
when the latch plate is released.
3.4.7 Interlock switch. When the training gear is rotated outboard
through 180 degrees from the zero degree relative position, the training
gear interlock switch shall be closed from 35 plus or minus 2.5 degrees to
145 plus or minus 2.5 degrees.
3.4.8 Training gear crank test. When the base of the torpedo tube is
level, the force required to initiate movement of the training gear, applied
tangentially to the arc described by the training gear crank handle, shall
be not greater than 30 pounds.
3.4.9 Retractable stop. The retractable stop, when in the operating
position, shall stop tube rotation at 45 degrees plus or minus 2.5 degrees
from the zero position.
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