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MIL-R-23016(Wep)
6.7.17
Production Model:
This is an equipment in its final mechanical and electrical
form of final production design and made by production tools,
jigs, fixtures, and methods.
6.7.18
Insulation Classes:
(a) Class A:  Class A insulation consists of (1) cotton, silk,
paper, and similar organic materials when either impreg-
nated or immersed in a liquid dielectric; (2) molded and
laminated materials with cellulose filler, phenolic resins,
and other rosins of similar properties; (3) films and
sheets of cellulose acetate and other cellulose deriva-
tives of similar properties; and (4) varnishes (enamel)
as applied to conductors.
(b) Class B:  Class B insulation consists of mica, asbestor,
fiber glass, and similar inorganic materials in a built-up
form with organic binding substances.
(c) Class C:  Class C insulation consists of mica, porcelain,
glass, quartz, and similar inorganic materials.
(d) Class H:  Class H insulation is defined in RTMA and AIEE
standards.
6.7.19
Intermittent and Short-time Operation:
Intermittent and short-tire operations are the alternating
periods of operation for the specified time followed by 15
minutes of non-operation.
6.8
Use of Helium:
Helium should not be used as a pressurizing gas in sealed units
containing electron tubes.  When it is necessary to use helium
for leak detection purposes, exposure should be limited to the
time necessary for the test, followed by thorough purging.
136

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