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Bus bar stresses
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Switching Equipment, Combat System, Command and Control, Fire Control, And Interior Communication General Specification
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Grouping of circuits and conductors



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MIL-S-17000N(SH)
3.6.23.12 Bus bar joints shall be made in accordance with Drawing
9000-S6508-73868. The joint shall have sufficient pressure so that the tem-
perature rise in the contact shall not increase the temperature of the bus bar
in that area.  Care shall be taken not to paint the contact areas.
3.6.23.13 Sufficient spare connecting holes shall be provided in bus bars
for changing the phase connections of all switches energized from the buses.
3.6.23.14 Bus bars on switchboards shall have two coats of red colored
insulating paint conforming to MIL-E-22118. Coating shall be flexible, tough,
and moisture and acid resisting, and have an insulation resistance value of at
least 500 V per mil thickness. Two coats each, between 0.004 and 0.006 inch
thick, shall be applied.  Before painting, burrs and sharp edges shall be
removed and bus bars cleaned to remove dust, grease, oil or other foreign
material.  Coatings shall be applied evenly and be free from pin holes, with
special attention given to all edges and projecting parts such as joints, bolts,
and nuts. Additional coats shall be applied over these parts as necessary to
ensure complete insulation and to prevent entrance of air or moisture to joints.
Scratches and mars on bus bar painting and joints disassembled during installa-
tion shall be repainted as required for painting bus bars before installation.
3.6.24 Switching and fusing requirements. Due to the variations in size
and function of switchboards, no detailed description of switching and fusing
requirements is included in this specification.  These requirements will be
specified on the detail schematic wiring diagrams provided in the ATDP.
3.6.25 Power supply tolerances.  Equipment used in the switchboard shall
operate within the input power supply tolerances as specified in DOD-STD-1399,
section 300 for 115-V 60-Hz type I power unless otherwise specified in the
applicable requirements of MIL-STD-1657.
3.6.26 Electrical parts mounting.  Small parts, such as resistors and
capacitors which are mounted by their leads, shall be mounted on terminal or
connection boards in accordance with requirement 5 of MIL-STD-454. Larger
parts such as relays, transformers, switches, circuit breakers, and meters,
shall be readily removable (that is, not secured by rivets).  These parts
shall be listed as independent items in the lists of parts (not as part of
a subassembly) using the actual manufacturer's part number.
3.6.27 Wiring.  Internal wiring for the switchboard shall be provided by
the contractor, and as specified in the ATDP.  This shall include:
(a) Internal wiring of panel-mounted assemblies, including linear
switch remote control circuit wiring.  For switch contact
wiring see 3.6.27.4.
(b) Flexible harness wiring between items mounted on the door and
connectors or terminal boards mounted on the fixed structure.
(c) Wiring on the modules.
(d) Intersection wiring between sections except where sections are
not mounted adjacent to each other.
(e) Wiring for sound powered telephone jack box and switchboard
internal light.
37

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