Photo-control devices shall conform to IEEE C136.10. Each photo-control
element shall be a replaceable, weatherproof, plug-in or twist-lock
assembly adjustable operation range of approximately 5.4 to 53.8 lux 0.5 to
5.0 foot-candles. Luminaires shall be equipped with weatherproof plug-in
or twist-lock receptacle to receive the photo-control element.
2.20.2
Timer Control Switches
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NOTE: If automatic control of luminaires is desired
and photo-control is not used, operation by timer
control shall be provided to ensure that luminaires
come on automatically. Normally, the astronomic
dial timer control switch shall be of the
automatically wound spring mechanism type. A
battery backed electronic switch capable of
maintaining accurate time for 7 hours following a
power failure may be substituted with the approval
of the Contracting Officer.
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Astronomic dial type arranged to turn "ON" at sunset, and turn "OFF" at a
pre-determined time between [2030 hours] [_____] hours and [0230 hours]
[_____] hours or sunrise, automatically changing the settings each day in
accordance with seasonal changes of sunset and sunrise shall be provided.
A switch rated [_____] volts, having [automatically wound spring mechanism]
[battery backed electronic clock] to maintain accurate time for a minimum
of 7 hours following a power failure shall be provided. A time switch with
a manual on-off bypass switch shall be provided. Housing for the time
switch shall be a surface mounted, NEMA [3R] [1 (indoor)] [4 (outdoor)]
enclosure conforming to NEMA ICS 6.
2.20.3
Manual Control Switches
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NOTE: Manual switches shall be used for control of
the lighting system when controls are located in a
space that is continuously supervised, such as a
gaurdhouse, gatehouse, or watchtower.
Mechanically held, electrically operated magnetic
contactors shall be used to control operation of the
lighting system circuits.
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Manual control switches shall conform to UL 98. The switches shall be the
heavy-duty type and shall be suitable for operation on a 120 volt, 60 Hz
system. The number of poles and ampere rating shall be as indicated.
Switch construction shall be such that a screwdriver will be required to
open the switch door when the switch is on. The selector switch shall have
a minimum of three positions: ON, OFF, and AUTOMATIC. The automatic
selection shall be used when photoelectric or timer control is desired.
The selector switch shall interface with the lighting system magnetic
contactor and control its activity.
2.20.4
Safety Switches
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SECTION 16528A
Page 26
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