c. MIL-STD 471, Maintainability Verification/
Demonstration/Evaluation.
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1.4.1
UPS shall have a minimum acceptable system Mean Time Between Failures
(MTBF) of [_____] hours. A failure is defined as any interruption to or
degradation of the UPS output. Automatic switching to bypass due to a
problem with the UPS system does not constitute a failure, provided that
the critical load is not disturbed.
1.4.2
UPS shall have a maximum acceptable system Mean Time To Repair (MTTR) of
[30] [_____] minutes. Repair time is defined as the clock time from the
arrival of the service technician to the time when the UPS is restored to
service either by repair or substitution of the failed component.
1.5
DELIVERY AND STORAGE
Equipment placed in storage shall be protected from humidity and
temperature variations, dirt, dust, or other contaminants.
1.6
PROJECT/SITE CONDITIONS
1.6.1
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NOTE: Designer must show approximate elevation
above sea level for project location if it exceeds
1,200 meters (4,000 feet). UPS system must be
derated if 50 degrees C (122 degrees F) operating
temperature is required.
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The UPS and battery system shall be capable of withstanding any combination
of the following external environmental conditions without mechanical or
electrical damage or degradation of operating characteristics.
a.
Operating altitude: Sea level to 1,200 m 4,000 feet. (Systems
applied at higher altitudes shall be derated in accordance with
the manufacturer's instructions).
b.
Non-operating altitude:
Sea level to 12,000 m 40,000 ft.
c.
Operating ambient temperature range:
0 to [40] [50] degrees C 32
to [104] [122] degrees F.
d.
Non-operating and storage ambient temperature range:
Minus 20 to
plus 60 degrees C Minus 4 to plus 140 degrees F.
e.
Operating relative humidity:
0 to 95 percent, without
1.6.2
Sound Pressure Levels
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NOTE: UPS modules rated up to 125 kVA should have a
SECTION 16265A
Page 13
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