ASHRAE 90.1-2001

Section: 9.2.1.1 - Automatic Lighting Shutoff

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Interior lighting in buildings larger than 5000 ft² shall be controlled with an automatic control device to shut off building lighting in all spaces. This automatic control device shall function on either

1. a scheduled basis using a time-of-day operated control device that turns lighting off at specific programmed times—an independent program schedule shall be provided for areas of no more than 25,000 ft² but not more than one floor—or
2. an occupant sensor that shall turn lighting off within 30 minutes of an occupant leaving a space—or
3. a signal from another control or alarm system that indicates the area is unoccupied.
    

Exceptions:

The following shall not require an automatic control device:

1. Lighting intended for 24-hour operation