MIL-DTL-28778A
3.15 Switches. The following switches shall be capable of carrying 5 amperes at 28 VDC inductive.
3.15.1 Thermostatic switch. The thermostatic switch shall have double throw contacts. The switch
contacts shall open when the actual internal temperature of the transformer increases to 105ºC.
3.15.2 Oil level switch. The oil level switch shall have normally closed contacts. The switch
contacts shall open when the oil level drops to a level so that any part of the coil is no longer submerged in oil.
3.15.3 Overpressure switch. The overpressure switch shall open when the internal pressure
exceeds normal maximum operating pressure by 20 percent of gage pressure.
3.16 Audible sound level. The transformer, when tested at rated levels, shall meet the requirements
of NEMA specification TR1-1993 for audible sound level.
3.17 Marking. Transformers shall be marked in accordance with MIL-STD-1285 and MIL-STD-130.
Markings shall remain legible after all tests. Unless otherwise specified (see 6.2) the following information shall be
included, the rated voltage and frequency of primary, rated voltages and currents of secondaries, working voltages to
ground for each winding, working voltages between windings whenever they exceed any of the applicable working
voltages to ground.
3.18 Workmanship. Workmanship shall be in accordance with guideline 9 of MIL-HDBK-454.
3.19 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
4.
VERIFICATION
4.1 Classification of inspection. The inspection specified herein are classified as follows:
(a) Materials inspection (see 4.3)
(b) First article inspection (see 4.4)
(c) Conformance inspection (see 4.5)
(1) Inspection of preparation for delivery
4.2 Materials inspection. Materials inspection shall consist of certification supported by verifying data
that the materials listed in table II, used in fabricating the transformers, are in accordance with the applicable
referenced specifications or requirements prior to such fabrication.
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