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 1.05 Time Delay - Ensure the O.S. has an adequate adjustable time delay (30 seconds to
30 minutes, minimum) for the application. Initially set delay to long "on" period, then
adjust time delay setting based on occupant movement patterns. Do not use the "instant
off" feature in any installation. Fluorescent lighting should have a minimum five minute
"on" time to avoid adversely affecting the expected life of the lamps and ballasts.
1.06 Sensor Specifications - Include the following information when specifying O.S.:
a) Sensor Type: passive infrared, ultrasonic, dual-technology, other
b) Mounting: ceiling, wall switch replacement, recessed, surface, other
c) Coverage Pattern: wide angle, narrow, 360 degree, other
d) Lens Type: standard, dense, long range, other (for PIR only)
e) Special Environment: high humidity, high or low temperature, other
f) Quality/Safety: specify Underwriters Laboratories (UL) listing
g) Time Delay: 30 seconds to 30 minutes, adjustable
h) Input Voltage: 120V, 277V, other
i) Adjustable Frequency: for multiple ultrasonic O.S. in same area only
j) Manual Override and Manual on-off
1.07 Information on Project Drawings - For projects with many sensors and many
different sized coverage area, include occupant sensor schedule and coverage patterns on
drawings. Schedule should include sensor type, description, coverage, and applicable
notes. Coverage patterns should be drawn to scale.
1.08 National Electrical Code (NEC) Requirements - The 1996 NEC has specific
requirements related to the installation of occupant sensors. Section 110-16 states that
illumination in electrical equipment rooms "shall not be controlled by automatic means
only." Be sure to include manual overrides for O.S. installed in electrical rooms. Section
210-70 permits the control of lighting outlets by O.S. in dwellings as long as there is
manual override capability or separate wall switch. See NEC Handbook for details.
1.09 Occupant Sensor Etiquette - Issue memo to personnel and post signs for visitors
indicating the presence of O.S. and reminding everyone that lights off does not necessarily
mean that the office is closed or that someone is not at work that day.
1.10 Daylighting Option - Occupant sensing may be coupled with daylighting sensors to
provide further energy conservation. Where fluorescent lighting is used, be sure that
appropriate dimming ballasts are specified for correct light output adjustment by
daylighting sensors.
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