UFC 3 -520-01
June 10, 2002
upper wall sensors should be used in most sensor applications, with multiple sensors
for large rooms.
F-12.3.4 In areas where motion sensor failure or operation can cause safety concerns,
consider leaving some portion of the lighting uncontrolled by the motion sensors. This
includes areas such as toilets, filing and storage rooms, and other areas that can have
tripping hazards.
F-12.3.5 The most common application problems with motion sensors are caused by
improper mounting of sensor units or using inappropriate sensor sensitivity patterns for
the application. Studies have shown that occupants will disable offending lighting
controls, thereby defeating the energy-savings goals . In most applications, sensor
types, sensitivity patterns, mounting heights, and locations should be based on the
manufacturer's recommendations.
F-12.3.6 Do not use motion sensors in applications in which lamp restrike times are a
concern.
F-12.4
Dimming Controls .
F-12.4.1 Recent developments and reduced costs of fluorescent dimming ballasts
permit the use of dimming for many applications.
F-12.4.2 There are several methods of dimming electric lights, including:
Two -wire forward phase control, which uses a solid-state dimmer and is compatible
with incandescent lamps, certain electronic ballasts for fluorescent and compact
fluorescent lamps.
Two -wire forward phase control, which uses a solid-state dimmer and is compatible
with incandescent lamps and inductive loads such as transformers for low voltage
lighting and high voltage neon and cold cathode lighting.
Two -wire reverse phase control, which uses a solid-state dimmer and is compatible
with incandescent lamps and "electronic transformers" for low voltage incandescent
lighting and certain electronic ballasts for fluorescent and compact fluorescent
lamps.
Two wire autotransformer dimming, which uses a power autotransformer to vary ac
voltage and is compatible with incandescent lamps, inductive loads such as
transformers for low voltage lighting and high voltage neon and cold cathode
lighting, and some other loads.
Three-wire forward phase control, which uses a solid-state dimmer and is
compatible with magnetic dimming ballasts for fluorescent lamps and certain
electronic ballasts for fluorescent and compact fluorescent lamps.
F-20
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