MIL-DTL-3124E(SH)
b.
Generator switchboard initial load:
(1) Load at rated power factor: 0.80 per-unit
c.
Motor cables for submarine ship service application only:
(1) Type: LSTGA-400 in accordance with MIL-DTL-24643
(2) Length: 114 feet from switchboard to motor
(3) Quantity: 4 cables in parallel
d.
For other applications, a cable impedance of 0.022 + 0.018j per-unit
3.4.29 Insulation resistance. The insulation resistance, when corrected to 77 °F (25 °C), shall be not less than
the following (see 4.6.10):
Megohms
Armature
Totally enclosed generator, rated 750 kW or less
50
Totally enclosed generator, rated greater than 750 kW
25
Fields
50
3.4.30 Lubrication system. The bearing lubrication system shall limit the back pressure within bearing cavity
to maintain a positive pressure in the bearing seal cavity during operation.
3.5 System safety program. Safety design features, including fail-safe features, shall be incorporated into the
design to prevent damage to equipment and to ensure optimal personnel protection during repair or interchanging of
any component or assembly (see 6.3).
3.6 Identification plates. The identification plates shall be attached to the part of the generator which is not
ordinarily renewed during its normal service life, and shall be located in an accessible position which can be read at
all times without danger to personnel. The plates shall be in accordance with Type C or D of MIL-DTL-15024 and
MIL-P-15024/5, and shall be installed on and furnished as a part of the generator for which it is intended. Type A
identification plates in accordance with MIL-DTL-15024 and MIL-P-15024/5, and constructed of corrosion-resistant
steel, nickel-copper alloy, or sheet brass may be used, except where one plate dimension exceeds 5 inches or where
more than one plate dimension exceeds 3 inches.
3.6.1 Identification plate markings. The main identification plates for generators shall include the following:
a. Manufacturer s name, identification symbols, serial number, Government drawing number of assembly,
and year of manufacture.
b. Salient design characteristics: type, kilowatt, capacity, voltage, current, kilovolt-ampere, frequency,
number of phases, power factor, revolutions per minute, overload rating, and permissible temperature rise (unless
classified).
c.
Contract number.
d.
National stock number (NSN).
e.
Section for Defense Contracts Management Agency (DCMA) stamp.
3.6.2.1 Magnet frame. The contractor s serial number shall be stamped on the housing which supports the
stator laminations.
3.6.2.2 Rotors. Markings on rotors shall identify the manufacturer, style, and type of generator. The serial
number of the rotor shall be stamped on the shaft at the end opposite to the prime mover.
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