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Occupancy Sensor or Vacancy Sensor: What the Energy Code Requires

The first question on any sensor spec is not the technology, it is the code. ASHRAE 90.1 and California Title 24 both require automatic lighting shutoff in most commercial spaces, and for many room types they specifically require manual-on operation, which means a vacancy sensor rather than an auto-on occupancy sensor. Manufacturer catalogs list their own sensors by model; none of them put the code decision on the category page. Here is the short version, with the usual caveat that the authority having jurisdiction and the adopted code year control the final answer.

Space TypeCommon RequirementWhy
Private offices, small conference roomsVacancy (manual-on, auto-off)Title 24 and 90.1 favor manual-on in enclosed spaces to prevent false-on energy waste
Restrooms, storage, break roomsOccupancy (auto-on, auto-off)Full automatic operation is generally accepted where hands-free switching matters
Classrooms and training roomsVacancy or partial-onPartial-on brings up a fraction of lighting automatically, the rest by manual switch
Warehouse aislesOccupancy with partial-off dimmingCodes increasingly require lights to drop to a low level, not full off, for safety
Corridors and stairwellsOccupancy with partial-offEgress paths typically may not go fully dark while the building is occupied

PIR, Ultrasonic, or Dual Tech: Match the Sensor to the Room

Once the control strategy is set, pick the sensing technology by room geometry rather than by brand loyalty. The three families behave differently around partitions, ceiling heights, and minor motion like typing.

TechnologyHow It DetectsBest ForWatch Out For
PIR (passive infrared)Body heat moving across line of sightOpen rooms, restrooms, high ceilings with lens optionsBlind to motion behind partitions; minor motion range is shorter than major motion range
UltrasonicDoppler shift in reflected sound wavesRestroom stalls, cubicles, L-shaped roomsAirflow from HVAC diffusers can cause false-on; keep away from vents
Dual technologyPIR plus ultrasonic in one unitClassrooms, conference rooms, spaces where false triggers are costlyHigher unit cost; confirm which technology is required to hold lights on

Coverage is stated per model as major and minor motion areas. Typical wall switch occupancy sensors cover on the order of 900 square feet of major motion in an open room; ceiling mounted units extend that with 360 degree lenses and are the right call for warehouses, gyms, and open offices. Always check the minor motion figure for desk work areas, since a sensor that only sees walking motion will time out on a room full of people typing.

Wall Switch Motion Sensor Switches

The fastest retrofit in the building is replacing a standard toggle with a motion sensor light switch. Wall switch occupancy and vacancy sensors install in the existing box, need no ceiling wiring, and immediately capture savings in offices, restrooms, and conference rooms. Check three things before ordering: whether the model requires a neutral conductor, the load types it supports (LED and electronic ballast loads are the norm now), and whether you need single pole or 3-way compatible units for multi-entry rooms.

Photocells and Rebates

For exterior automation, photocell controls switch on outdoor fixtures at dusk, with shorting cap and twist-lock NEMA options for area lights; see Photocell Controls. Occupancy sensors are also a standard utility rebate measure, so keep model numbers and spec sheets from the product pages for the incentive application. Browse indoor models under Occupancy Sensors, pair them with Dimmers for partial-off strategies, or see Switches and Smart Wiring Devices to complete the controls package.

Frequently Asked Questions

An occupancy sensor turns lights on automatically when it detects a person and off after the space empties. A vacancy sensor only turns lights off automatically; a person must switch them on manually. Energy codes often prefer or require vacancy operation in enclosed spaces like private offices because auto-on wastes energy when daylight is already adequate. Many models ship configurable to either mode.

Under California Title 24 and recent ASHRAE 90.1 editions, enclosed spaces such as private offices, small conference rooms, and classrooms commonly require manual-on control, which means vacancy operation or a partial-on strategy that automatically raises only part of the lighting. Restrooms, storage rooms, and similar spaces generally may use full auto-on occupancy control. The adopted code year and local amendments control, so confirm with the AHJ.

Pick by room geometry. PIR needs line of sight, so it suits open rooms and mounts with clear views. Ultrasonic detection wraps around partitions, making it the choice for restroom stalls and cubicle areas, though HVAC airflow can trigger false-ons. Dual technology combines both and is the safest pick for classrooms and conference rooms where nuisance switching is unacceptable.

Typical wall switch sensors cover roughly 900 square feet of major motion, such as walking, in an open room, with a smaller minor motion zone for desk level movement like typing. Actual coverage depends on the lens pattern and mounting position, and partitions cut PIR coverage sharply. For open areas beyond a single sensor's pattern, step up to ceiling mounted units with 360 degree coverage.

Modern sensors are rated for LED and electronic driver loads, but check two specs. First, the minimum load: some older sensor designs need more connected wattage than a small LED circuit draws. Second, the load type rating on the datasheet should explicitly list LED at your voltage. Models requiring a neutral conductor handle low LED loads more reliably than two-wire designs that leak current through the fixture.

Yes, lighting controls are a standard prescriptive rebate measure in most utility efficiency programs, typically paid per sensor or per controlled watt. Wall switch sensors, ceiling mounted sensors, and fixture integrated sensors usually qualify when they control interior lighting. Keep the model numbers and spec sheets from the product pages; rebate applications generally ask for both, plus the controlled fixture count.

Center the sensor over the area it controls, keep it at least 6 to 8 feet from HVAC diffusers if it uses ultrasonic detection, and avoid mounting where shelving or partitions block the lens pattern. In aisles, place sensors so their major motion coverage overlaps at the ends of each run. Follow the manufacturer's coverage template for the specific lens; patterns differ meaningfully between models.