MIL-DTL-16036M(SH)
3.5.9.2.1 Fan monitoring system. A system shall monitor fans. The system shall have features for fan failure
detection and fan failure alarms. The system shall have features for temperature monitoring and over-temperature
alarms. Individual fuses shall be used for each fan. The alarms shall be visible from the front of the switchgear
sections.
3.5.9.2.2 Fan shutdown during water mist. When water mist is specified, fans shall not be running during water
mist events.
3.5.10 Vibration. Units of all switchgear groups shall be constructed to withstand the Type I vibration test as
specified in MIL-STD-167-1 (see 4.4.3.4). The maximum frequency of vibration shall be as specified (see 6.2).
3.5.11 Materials. Switchboard structure may be either of steel or aluminum construction as specified (see 6.2).
Steel conforming to ASTM A131/A131M shall be utilized in the fabrication of switchboard structures. Steel
conforming to ASTM A1011/A1011M shall be used for plates and sheets. Aluminum alloy conforming to
ASTM B221, alloy 5086-H111 or 6061-T6 shall be used for bars, rods, profiles, and tubes. Aluminum alloy
conforming to ASTM B209, alloy 5052-H32 or 5086-H32 shall be used for plates and sheets. When aluminum
components are subsequently bent, 50XX grades of aluminum shall be used.
3.5.12 Thread locking devices. Unless otherwise specified in the individual equipment specifications, locking
devices shall be provided on the following basis for electrical connections and mechanical assemblies in all
switchboards, switchgear units, and in all equipment. A visual method to check fastener looseness (such as torque
check paint) shall be provided for fasteners not subject to periodic maintenance.
3.5.12.1 Electrical connections. Nuts, bolts, studs, and screws used for electrical connections shall be secured
by means of a locking device, except that a locking device need not be provided where solderless types of
connectors are used for conductors below 14 American Wire Gauge (AWG) [4000 circular roils (cmils)]. See 3.10
for bus bar connections.
3.5.12.2 Mechanical assemblies. Nuts, bolts, studs, and screws used for structural purposes shall be secured by
means of an acceptable locking device where continuous satisfactory operation, under the shock, vibration, and heat
conditions specified herein, or as specified in the individual equipment specifications, depends on maintaining tight
connection of parts, or where a holding screw, nut, bolt, or component part could fall into the equipment. Anchor
devices for thumbscrews (see figure 13) that are used to attach front and rear panels to the switchboard framing shall
use hex head or counter-sunk head bolts and self-locking nuts, or button socket-head or flat socket-head, self-locking
screws in tapped holes. Welding, brazing, or riveting shall not be used for anchor devices.
3.5.12.3 Acceptable locking devices. Unless specified in 3.5.12.4 or otherwise specified herein, any locking
device rated for 250 °F or higher that performs successfully in first article testing shall be suitable for use with the
following exceptions/caveats:
a. Self-locking nuts are the preferred method and shall be in accordance with applicable military
specifications.
b. Castellated nuts with cotter pinning or safety wiring are not recommended for applications requiring
accurate loads such as bus joints.
c. Toothed lockwashers may be used where the weight of the part does not exceed 2 ounces per screw, such as
a terminal block.
d. Split ring lockwashers may be used where the weight of the part does not exceed 2 ounces per screw, such
as a terminal block.
e. Non-liquid threadlocking adhesive may be used on any electrical joint except contact nuts and contact
spacer nuts.
f.
Bolt self-locking elements shall be in accordance with MIL-DTL-18240.
3.5.12.4 Prohibited locking devices. The following devices shall not be used for thread locking even in
conjunction with a recommend locking device.
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