Fitting and tuning an occupancy sensor switch

What you’ll need

• Voltage tester
• Screwdrivers
• Wire connectors

Step by step

1. 1

   Pick the right rooms

   Hallways, closets, laundry rooms, garages and pantries — anywhere lights get left on because nobody stays long.

2. 2

   Cut power and verify

   Turn off the breaker and confirm the switch is dead with a voltage tester before removing the plate.

3. 3

   Wire it in

   Follow the sensor's diagram for line, load and ground, plus neutral if required. Photograph the old wiring first.

4. 4

   Choose occupancy or vacancy mode

   Occupancy turns lights on automatically; vacancy requires a manual on but still turns off by itself. Vacancy saves more.

5. 5

   Tune the timeout and sensitivity

   Start with a 5-minute timeout. Extend it in rooms where you sit still, shorten it in pass-through spaces.

Energy-saving tips

• Vacancy mode is the better default in rooms with good daylight.
• Aim the sensor at the doorway, not at a heating vent or a window.
• Confirm the sensor is rated for LED loads — some older models need a minimum wattage.