Skip to Main Content

This information is provided free of charge by the Department of Industrial Relations from its web site at These regulations are for the convenience of the user and no representation or warranty is made that the information is current or accurate. See full disclaimer at
Subchapter 7. General Industry Safety Orders
Group 2. Safe Practices and Personal Protection
Article 7. Miscellaneous Safe Practices
Return to index
New query

3317. Illumination.

(a) Working areas, stairways, aisles, passageways, work benches and machines shall be provided with either natural or artificial illumination which is adequate and suitable to provide a reasonably safe place of employment. Minimum illumination levels for safety alone are listed for various typical areas in Table IL-1. (Title 24, Part 2, Section 512, Table 5-C.)

                                              TABLE IL-1

                               MINIMUM LEVELS OF ILLUMINATION FOR SAFETY

Hazards Requiring 
Visual Detection        Slight                                                 High
Normal Activity
Level                   Low                   High                   Low                 High
Areas                   Storage Yards          Loading Areas         Elevators           Engine Rooms
                        Offices                Warehouses            Stairways           Processing Area
                        Locker Rooms           Corridors             Assembly Areas      Machine Shop
                                               Washrooms             Layout Areas        Sheet Metal Works
                                               Spray Booths                              Woodworking Shops
Footcandles             0.5                    1.0                   2.0                 5.0

NOTE: (1) To assure these levels at all times, higher initial levels need to be provided to compensate for their depreciation due to the decrease of light output of lamps with age and to the accumulation of dirt on lamps and room surfaces.(2) For areas or operations not covered above, and for recommended illumination levels for efficient visual performance in varied tasks and areas, refer to , ANSI/IES RP-7-1991, Practice for Industrial Lighting and ANSI/IES RP-1-1993, Practice for Office Lighting.(Title 24, Part 2, Section 512, Table 5-C)

(b) When adequate natural illumination or permanent artificial illumination cannot be made available to secure the safety of employees, suitable portable lights shall be provided.

(c) Skylights, side windows, lamps, and other light accessories which provide necessary illumination shall be kept sufficiently clean, adjusted, and repaired so as not to impair the illumination required for the safety of employees.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.


1. Amendment of subsection (a) filed 11-28-75; effective thirtieth day thereafter (Register 75, No. 48).

2. Amendment filed 7-16-76; effective thirtieth day thereafter (Register 76, No. 29).

3. Editorial correction filed 10-7-83; effective thirtieth day thereafter (Register 83, No. 41).

4. Amendment of subsection (a) and footnotes to Table filed 2-11-99; operative 3-13-99 (Register 99, No. 7).

Go BackGo Back to Article 7 Table of Contents