Title 24 Requirements for Commercial Building
Energy Codes,Rebates & Incentives

California

Title 24 is California's energy efficiency code. The primary requirements of the code affect many facets of commercial buildings. These areas include:
Lutron has a variety of commercial controls that meet Title 24 code requirements. See a detailed list of these products below.

Area Controls

Each space enclosed by ceiling height partitions will have at least one device to independently control the general lighting within the space. Each manual device will be readily accessible and located where occupants can see the controlled lighting.

The control device can be a manual control or an occupancy sensor. It must be able to override other devices, such as a timeclock control device.

Display lighting must be separately switched on circuits that are 20 amps or less.

Exceptions:
  • Up to 0.5 W/ft2 of lighting for security or egress
  • Areas where only authorized personnel are allowed to use the switches

All control devices must be CEC certified.

Multi-level Lighting Controls

These devices reduce lighting power by either continuous dimming, stepped dimming, or stepped switching while maintaining a reasonably uniform level of illuminance throughout the controlled space.

Multi-level lighting controls will be used for any enclosed space 100 ft2 or larger that has a connected lighting load greater than 0.8 W/ft2, and that has more than one luminaire. The multi-level lighting controls must have one control step that is between 50% and 70% of design lighting power and at least one step of minimum output operating at less than 35% of full rated lighting system power (this could be completely off).

Exceptions:
  • Corridor lighting

Automatic Shut-off

Interior lighting in buildings will be controlled with an automatic control device to shut off building lighting in all spaces.

This device may be an occupant sensor, timeclock, or other device capable of automatically shutting off lighting.

If a timeclock device is used, it must:
  1. Have holiday feature, which turns off the lights for at least 24 hours during a holiday
  2. Have a readily accessible manual override device, which is located where the person using the override can see the lights
  3. Have an override limit of not more than 2 hours (with some exceptions)
  4. Control an area less than 5,000 ft2 or less than 20,000 ft2 for malls, auditoriums, single-tenant retail spaces, industrial facilities, convention centers, and arenas

Exceptions:
  • Areas continuously lit, 24 hours per day/365 days per year
  • Lighting in corridors, guest-rooms, and lodging quarters of high-rise residential buildings and hotels/motels
  • Up to 0.5 W/ft2 of lighting for any area that must be lit for security or emergency egress

Daylighting

Lighting power will be reduced in areas where the daylight can help illuminate the space. Daylit areas in enclosed spaces greater than 250 ft2 must have a light control that:
  1. Controls at least 50% of the power in the daylit areas separately from other lighting in the space
  2. Controls luminaires in vertically daylit areas separately from horizontally daylit areas
  3. Maintains a reasonable uniform level of illuminance in the space
Daylit areas in enclosed spaces under skylights that are larger than 2,500 ft2 must use a multi-level daylighting control or astronomical timeclock device with override capability.

Exceptions:
  • Daylit areas where the effective aperture is less than 0.1 for vertical glazing and less than 0.006 for skylights
  • Areas where obstructions make daylighting infeasible

Exterior Lighting Control

Lighting for most exterior applications will have automatic controls capable of turning off exterior lighting when sufficient daylight is available or when the lighting is not required during nighttime hours.

All permanently installed lighting will be controlled by a photosensor or astronomical timeclock device.

Exceptions:
  • Parking garages
  • Tunnels
  • Large covered areas that require illumination during daylight hours


For building facades, parking lots, garages, canopies, and all outdoor sales areas, where 2 or more luminaires are used, an automatic timeclock device shall:
  1. Turn off lights when not needed
  2. Reduce lighting power by at least 50% but not exceeding 80%, or provide continuous dimming through a range that includes 50% through 80% reduction

Exceptions:
  • Emergency lighting
  • Lighting for steps or stairs
  • Lighting controlled by a motion sensor and photocontrol
  • Lighting for facilities that have equal lighting requirements at all hours and are designed to operate continuously
  • Temporary outdoor lighting
  • Internally illuminated, externally illuminated, and unfiltered signs

Display Lighting

 

Display lighting must be separately switched on circuits that are 20 A or less.

Optional Control Incentives

Title 24 also contains optional lighting incentives for commercial buildings. These incentives can be gained by using the following:
  1. Multi-level occupancy sensor for spaces less than 250 ft2 (20% increase in Lighting Power Density [LPD])
  2. Demand responsive lighting controls (5% increase in LPD)
  3. Manual dimming with electronic dimming ballasts (10% increase in LPD)
  4. Demand responsive controls with electronic dimming ballast (15% increase in LPD)
  5. Multi-level occupancy sensor with automatic daylighting controls for spaces less than 250 ft2 (10% increase in LPD)
  6. Electronic dimming ballasts with multi-level occupancy sensor for spaces less than 250 ft2 (25% increase in LPD)
  7. Automatic daylighting controls where not required (8-34% increase in LPD depending on effective aperture and LPD requirement)

Lighting Control Acceptance

All lighting controls serving the building will be certified as meeting the Acceptable Requirements for Code Compliance. A Certificate of Acceptance will be submitted to the building department that certifies the lighting systems and controls comply with Title 24 requirements.

Lutron Systems for CEC Title 24

Automatic shut-off Area controls Day-lighting Exterior lighting Multi-level lighting controls

Dot denotes the specific code requirement with which a product complies when used appropriately.

Entire-room solutions
EcoSystem Complies Complies Complies Complies
GRAFIK Eye 3000 Complies Complies Complies Complies Complies
GRAFIK Eye QS Complies Complies Complies Complies Complies
Occupancy sensors Complies Complies  
Wallbox dimmers Complies Complies
RadioTouch Complies Complies Complies Complies
Spacer System Complies Complies
Building switching systems
Softswitch Complies Complies Complies Complies  
Total building controls
Quantum Complies Complies Complies Complies
EcoSystem Complies Complies Complies Complies
LCP 128 Complies Complies Complies Complies Complies
GRAFIK 7000 Complies Complies Complies Complies Complies
Workplace lighting controls
EcoSystem Complies Complies Complies Complies

For Additional Information

Call the CEC:
• Inside California 1-800-772-3300
• Outside California 916-654-5106
Visit the CEC website at www.energy.ca.gov/title24



For clarification of terms used on this page, please review Lutron's glossary of terms.
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