MIL-DTL-17587C(SH)
3.4.2 Safety. To ensure maximum personnel safety and to minimize equipment casualties, the safety
requirements of MIL-E-917 shall be adhered to during the design and manufacture of circuit breakers, cradles, and
attachments.
3.4.2.1 Polyvinyl chloride (PVC). PVC material shall not be used unless it is a part of or integral to the leads
of a component or as a constituent or integrated element of a component.
3.4.3 Ambient temperature. Circuit breakers, cradles, and attachments shall operate in a switchboard enclosure
ambient air temperature outside the switchboard of 0 to 50 degrees Celsius (°C).
3.4.4 Special tools. Special tools used as manual means to prevent circuit breakers from moving in the test,
disconnect, and withdrawn positions shall be supplied with each circuit breaker as applicable. Special tools shall
not be required for the removal of the circuit breakers from the front of its specified enclosure except for drawout
wrench. When special tools are required for maintenance, the tools shall be supplied as specified (see 6.2).
3.4.5 Mounting and dimensions. Maximum outline and mounting dimensions for the circuit breaker types shall
be as shown in the applicable specification sheet. When MIL-DTL-16036 standardized switchgear unit is specified
as the enclosure for the circuit breakers (see 6.2), the circuit breakers shall be mounted and operated in the
switchgear unit. Studs or tapped holes, retainer nuts or threaded inserts shall be provided in the rear of the
stationary element as shown in applicable specifications sheet for blind bolting to the switchboard. Bolts shall be
provided and shall resist a high impact mechanical shock test, in accordance with the requirements of MIL-DTL-
16036.
3.4.6 Current carrying connections. Current-carrying connections shall be silver-plated in areas of current-
carrying contact with lugs, terminals, bus ties, and screw bolts. Silver plating shall be in accordance with ASTM
B700, with the exception that the silver plate shall be 0.0002-inch thick or greater. The contact surfaces of all bus
bars shall be silvered up to 1 inch past the joint area.
3.4.7 Electrical arc enclosures. Electrical arc enclosures shall confine the arc to the switchboard enclosure
under all specified operating conditions.
3.4.8 Thermoplastic parts. Unless otherwise specified (see 6.2), selected parts may be made from
thermoplastic material.
3.4.9 Painting. Circuit breaker metal parts not having a corrosion resistant treatment, or not fabricated of
corrosion resisting material of the types specified in MIL-E-917, shall be prepared and painted in accordance with
MIL-E-917, with the exception that only one coat of gray enamel shall be applied. Touching up is permitted for
marks or scratches due to assembly, testing, or other factory handling.
3.4.9.1 Powder coating. Powder coating may be used as an alternative to painting. The type of powder
coating, method of application, curing, and repair shall be as specified (see 6.2).
3.4.9.1.1 Selection. The powder coating shall be based on thermoset powder. The selected powder coating
shall not contain any unacceptable, prohibited, or toxic materials unless otherwise approved by the procuring
agency. Unacceptable and prohibited materials include asbestos, cadmium, fungus-susceptible materials, lithium
and lithium compounds, magnesium and magnesium compounds, mercury and mercury compounds or amalgams,
radioactive materials, zinc and zinc compounds or zinc chromate primer or coatings, flammable materials, and
polyvinylchloride. Toxic materials include any material known to produce harmful toxic effects under conditions,
including fire, encountered in shipboard service.
3.4.9.1.2 Appearance. The part surface shall be cleaned, prepared and powder coated in a manner that provides
a smooth, continuous, and completely cured surface.
3.4.9.1.3 Color. The final powder coated surface shall be light gray in color.
3.4.9.1.4 Thickness. The thickness of powder coated surfaces shall be the nominal thickness initially qualified
to meet adhesion and salt spray resistance requirements of 3.4.9.1.5.1 and 3.4.9.1.5.2, respectively.
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