MIL-DTL-24765A(NAVY)
3.3.3.2 Cabinet arrangement. The equipment, excluding the battery rack enclosure, shall consist of one or more
cabinets (see 6.4.1) with height not greater than 72 inches. When specified (see 6.2), width and depth shall be
selected to enable the cabinets to go through a 30- by 30-inch hatch with round corners of 7.5-inch radius, and 26-
by 45-inch doors with round corners of 7.5-inch radius. For UPS rated 5 kVA and greater, a separate cabinet shall
be provided for the by-pass switch that allows total electrical isolation of the UPS for maintenance purposes by
removing all electrical energy sources from the UPS cabinet An alternative to this by-pass switch is a circuit
breaker or other similar device located in a switchboard.
3.3.3.3 Cabinet enclosure. The cabinet enclosures shall be dripproof (45-degree) in accordance with
MIL-STD-108.
3.3.3.4 Ground connection. All exposed metal parts of the UPS cabinets and components shall be at ground
(ship's hull) potential at all times. A ground stud shall be provided on each cabinet in accordance with
MIL-STD-1310 to accept a Class C, Type II bond strap. The ground stud shall be clearly marked.
3.3.4 Input/output (I/O) connections. Threaded terminal studs with lockwashers and locknuts shall be provided
to accept the input and output cable terminal lugs. Cables shall be in accordance with MIL-DTL-24643.
3.3.5 Remote control panel. Signals for the remote control and monitoring of the UPS shall be provided for a
remote control panel, when specified (see 3.2.7 and 6.2), which shall be a computer terminal. The remote control
panel shall be connected to the UPS by cable in accordance with MIL-DTL-24643.
3.3.6 Identification plate. The UPS shall be equipped with an identification plate.
3.3.6.1 Operation instruction plate. The UPS shall be equipped with an operation instruction plate.
3.3.7 Human engineering. Human engineering shall be in accordance with ASTM F1166.
3.3.8 Safety. The UPS safety requirements shall be in accordance with MIL-E-917. MIL-HDBK-454 may be
used for guidance.
3.4 Component requirements.
3.4.1 Selection of parts. The number of different parts to be designed into the UPS shall be kept to a minimum
consistent with its intended use.
3.4.2 Electrical components and semiconductors. Derating of electrical components and semiconductors shall
be in accordance with MIL-E-917.
3.5 Environmental requirements.
3.5.1 Shock. The UPS shall meet the Grade A shock acceptance requirements of MIL-S-901 when tested as
specified in 4.6.28.
3.5.2 Vibration. The UPS shall meet the Type I vibration requirements in accordance with MIL-STD-167-1 up
to and including 15 Hz without sway braces. When a higher frequency up to and including 25 Hz is required for a
class of ship (see MIL-STD-167-1), sway braces may be used.
3.5.3 Noise. The UPS shall meet the noise requirements of 3.5.3.1 and 3.5.3.2 when mounted in accordance
with manufacturer's recommendations.
3.5.3.1 Airborne noise. The UPS shall meet the airborne noise requirements in accordance with
MIL-STD-740-1, Grade B equipment.
3.5.3.2 Structureborne noise. The UPS shall meet the structureborne noise requirements in accordance with
MIL-STD-740-2, Type III equipment.
3.5.4 Electromagnetic interference emission and susceptibility. The UPS shall meet EMI requirements in
accordance with MIL-STD-461.
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