MIL-C-52009D
3.3 Materials. The materials shall be as specified herein and as shown on the applicable drawings.
Materials used in the construction of these panel-assemblies shall be fungus inert. When materials are
not specified, materials shall be used which enable the control-panel assemblies to meet the
requirements of this specification. Note, however, that the tin content of control-panel assembly
components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3
percent lead, by mass (see 6.6). Acceptance or approval of any constituent material shall not be
construed as a guarantee of the acceptance of the finished product.
3.4 Operation. Each control-panel assembly, with an input of 115 volts, AC, 60 Hz, and with the
autotransformers set at maximum voltage, shall operate without malfunction when a load of two 100 watt,
110/115 volt lamps are connected in parallel to any one of the four output circuits with no load on the
other three circuits. The autotransformer's output voltage shall be not more than 120 volts and not less
than 112 volts.
3.5 Temperature and humidity. The control-panel assembly shall not be damaged by a storage
temperature of 155°F with 80 to 98 percent relative humidity, and by operation at ambient temperatures
from +120°F to -50°F with humidity uncontrolled.
3.6 Circuit breaker. The circuit breaker shall withstand a 15 percent overload for 60 minutes without
overheating, and shall be set to trip at 25 percent overload within 60 minutes.
3.7 Splashproof and spraytight case. The case shall be splashproof and spraytight in accordance with
3.8 Operational reliability. The control-panel assembly, connected to a 115 volt, AC, 60Hz power
source, and with a 5 ampere load, shall operate without malfunction for 50 hours.
3.9 Treatment and painting. The control-panel assembly shall be cleaned, treated, and painted in
3.10 Moisture resistance. The electrical circuitry, including all components and connections, except as
specified below, shall be protected from the effects of moisture by an overall treatment with a varnish or
similar coating to the maximum extent practicable:
a. Components or circuit elements that are inherently moisture resistant or which are hermetically
sealed need not be treated.
b. Components or circuit elements whose functions will be adversely affected by the varnish coating
shall not be treated.
3.11 Identification marking. The identification markings shall be in accordance with MIL-STD-130, as
shown on the drawings.
3.12 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.13 Workmanship. The control-panel assembly shall be free from dirt, scale, flux, and other
extraneous material. All electrical connections shall be secure, metal joints and seams shall be tight, and
all edges shall be rounded or beveled.
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