MIL-PRF-17773C(SH)
3. REQUIREMENTS
3.1 Qualification. Switches furnished under this specification shall be products that are authorized by the
qualifying activity for listing on the applicable qualified products list before contract award (see 4.2 and 6.3).
3.2 Materials. The contractor shall select materials capable of meeting all of the operational and environmental
requirements specified herein in accordance with MIL-E-917.
3.2.1 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.
3.2.2 Electrical insulation. Electrical insulating materials shall be in accordance with the requirements of MIL-
DTL-16036 and MIL-E-917.
3.2.3 Parts. Parts shall be in accordance with the requirements of MIL-E-917.
3.2.4 Light emitting diodes. Light emitting diodes (LEDs) shall meet the requirements of MIL-PRF-
19500/519, MIL-PRF-19500/572, or MIL-PRF-19500/708.
3.2.5 Indicator lights, lamps, and lenses. AC (alternating current) indicator lights shall conform to type LH98/4
for 450-VAC service and type LH98/3 for 120-VAC service in accordance with MIL-L-3661/65. DC indicator
lights shall conform to style LH96/5 for 120-VDC service and type LH96/6 for 240-VDC service in accordance with
MIL-L-3661/63. Lenses shall be style LC40 in accordance with MIL-L-3661/54, with lens color as specified herein.
3.2.6 Serial connection. If the ABT has embedded software (firmware) that is capable of being communicated
by external means, then communications shall be by an RS-232, USB2.0, or firewire IEEE 1394 (or similar, if
supported by industry standards) port for a remote computer for the purpose of controlling the ABT electrical
parameters and to allow programming of setpoints. A software program shall be provided to interface with the ABT
for the purpose of establishing these parameters and setpoints during shipboard installation. No infrared or RF
communications are allowed.
3.2.7 Relays. If electro-mechanical relays are used, they shall meet the requirements of MIL-R-19523 and shall
have operating voltages as specified in 3.4.2.3.3. Dashpots operating with oil or air as the retardant for controlling
the speed of operation of a relay shall be hermetically sealed.
3.2.8 Creepage and clearance distances. Electrical creepage and clearance distances shall be in accordance
with MIL-E-917.
3.2.9 Nameplates. Manufacturer identification other than that allowed for the nameplates shall not appear on
the equipment. Markings shall be in accordance with MIL-DTL-15024 and MIL-P-15024/5.
3.2.9.1 Embedded software. Embedded software (firmware) that is used in ABTs shall appear on the
nameplate by name and/or part number, the version number or designator. Equipment furnished with embedded
software and/or calibration software shall have software certified by independent V&V (Verification and Validation)
testing to NIST SP 500-234 and IEEE 1012 standards.
3.2.10 Plating. Switch bus bars shall be silver-plated in accordance with MIL-DTL-16036, in areas of current-
carrying contact with lugs, terminals, bus ties, screw bolts, and so forth. The contact surfaces of bus bars shall be
silver-plated up to 1 inch past the joint area. In lieu of this, the entire bus may be silver surfaced, or on each copper
bus bar, an area around each hole may be silvered, provided the silvered area around the hole is not less than a 1/8-
inch wide band. Threaded surfaces, used as electrical contact surfaces, shall have silver thickness of at least 0.0002
inch.
3.2.11 Cable entrance. Switches shall enable cable entry and exit from the top or the bottom of its enclosure.
The cable entrance plates when provided shall be blank to facilitate terminals or stuffing tubes for passage of cables.
The plates shall be sealed to the level of effectiveness of the enclosure (see 3.4.41).
3.2.12 Wire, wiring methods, and marking. Wire, wiring methods, and marking shall be in accordance with
the requirements of MIL-E-917. Color-coded wire may be used in accordance with MIL-STD-681.
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