2.4.3
Components shall be capable of being maintained using commercially
available standard tools and equipment. Components shall be arranged and
assembled to be readily accessible to maintenance personnel without
compromising defeat resistance of IDS.
2.4.4
Availability
Provide components designed for continuous operation. Provide solid-state
electronic components, mounted on printed circuit boards conforming to UL
796. Boards shall be plug-in, quick-disconnect type. Circuitry shall not
be so densely placed as to impede maintenance. Power-dissipating
components shall incorporate safety margins of not less than 25 percent
with respect to dissipation ratings, maximum voltages, and current-carrying
capacity. Light duty relays and similar switching devices shall be
solid-state type or hermetically sealed electromechanical. Electrical
indicating instruments incorporated into system components shall conform to
applicable provisions of ANSI C39.1.
2.4.5
2.4.5.1
Interior Conditions
Equipment installed in environmentally protected interior areas shall meet
performance requirements specified for the following ambient conditions:
a.
Temperature: 0 to 50 degrees C 32 to 120 degrees F.
Components installed in unheated security protected areas shall
meet performance requirements for temperatures as low as minus 17
degrees C zero degrees F;
b.
Pressure:
Sea level to 4,573 meters 15,000 feet above sea level;
c.
5 to 95 percent;
d.
Fungus: Components shall be constructed of nonfungus nutrient
materials or shall be treated to inhibit fungus growth; and
e.
Acoustical noise: Components shall be suitable for use in high
noise areas above 100 dB, such as boiler rooms, power plants, and
foundries without adversely affecting their performance.
2.4.5.2
Exterior Conditions
Components mounted in locations exposed to weather shall be housed in
corrosion-resistant enclosures with appropriate environmental protection.
Component performance shall not degrade because of improper housing design.
Components in enclosures shall meet performance requirements when exposed
to the following ambient conditions:
a.
Temperature:
Minus 32 to 60 degrees C Minus 25 to 140 degrees F;
b.
Pressure:
Sea level to 4,573 meters 15,000 feet above sea level;
c.
Solar radiation: Six hours of solar radiation at dry bulb
temperature of 60 degrees C 120 degrees F including 4 hours of
solar radiation at 0.00112 watts per square millimeter 104 watts
per square foot;
SECTION 13703N
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