MIL-DTL-26517B
(Applications for copies may be addressed to the Society of Automotive Engineers, 400 Commonwealth Drive,
Warrendale, PA 15096-0001, phone (412) 776-4841 or FAX: (412) 776-4026)
2.4 Order of Precedence. In the event of a conflict between the text of this document and the references cited
herein (except for related associated specifications, specification sheets, or MS standards), the text of this document
takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific
exemption has been obtained.
3. REQUIREMENTS
3.1 Qualification. The power supplies furnished under this specification shall be those products which are
qualified for listing on the applicable qualified products list (QPL) at the time set for opening of bids (see 4.3 and
6.3).
3.2 Selection of specifications and standards. Specifications and standards for necessary commodities and
services not specified herein shall be selected in accordance with current industry standards.
3.3 Materials.
3.3.1 Fungus-proof materials. Materials that are nutrients for fungi shall not be used where it is practicable to
avoid them. Where used and not hermetically sealed, they shall be treated with a fungicidal agent acceptable to the
procuring activity. However, if they will be used in a hermetically sealed enclosure, fungicidal treatment will not be
necessary.
3.3.2 Combustible materials. Materials that support combustion and maintain open flame after the ignition
source has been removed shall not be used. High-temperature materials shall be used throughout the power supply
(see 4.5.1).
3.3.3 Metals. Metals shall be of the corrosion-resistant type or suitably treated to resist corrosion due to fuels,
salt spray, or atmospheric conditions that may be encountered in storage or normal service. Tests to confirm
corrosion resistant metals are contained in section 4, Table I, sequence numbers 23 and 24, paragraphs 4.5.12.2
Humidity and 4.5.12.3 Salt Spray.
3.3.3.1 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not
be used in intimate contact with each other. Dissimilar metals are defined in MIL-STD-889.
3.4 Design and construction. Unless otherwise specified, the power supply shall meet the requirements
specified herein.
3.4.1 Components. The power supply shall consist of transformers, rectifiers, and other components, except
electron tubes, necessary to meet requirements for the performance specified herein. Parallel diodes shall not be
used.
3.4.2 Input current balance. The current input to each phase of the power supply shall be within 5 percent of
the average value of the effective current in all phases for any condition from ¼ load to full load (see 4.5.16).
3.4.3 Voltage adjustment range (Type I only). The output voltage of the power supply shall be adjustable over
the range as specified in the acquisition document (see 6.2). The adjustment control shall be readily accessible and
provisions shall be made for positive locking.
3.4.4 Service life. The power supply, with the exception of the fan motor, shall be designed for a service life of
at least 8,000 hours without maintenance. The fan motor, if supplied, shall have a life of at least l,500 hours without
maintenance.
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