For specific important tasks required to be carried out in the control room, the illuminance levels should be consistent with those listed in Table 12.1.
Additional Information: The values in Table 12.1 are preferred levels based on conservative assumptions about the reflectance of the task background, the age of the operator, and the criticality of the task being performed. These illuminance values were derived for analog control rooms and are, for the most part, higher than the illumination levels specified under “General Illumination Level” above. Lower illuminances may be justified for more favorable visual conditions or where the need to perform critical tasks can be ruled out. Lower illuminances are also generally appropriate for computer-based control rooms. Local task illumination should be employed where specific tasks at isolated locations require extra illumination. The “Visual Display Device” nominal value in Table 12.1 should be considered for tasks primarily consisting of viewing and interacting with visual display devices with minimal or no paperwork. The higher illuminances given under “General Illumination Levels” above should be used for tasks where paperwork is required in combination with the use of visual display devices.26 0700, 5680, 11064-6
© ISO. This material is excerpted from ISO 11064-6: 2005 with permission of ANSI on behalf of ISO. All rights reserved.
Table 12.1 Nominal Illumination Levels For Various Tasks And Work Areas
Work Area or Type of Task |
Task Illuminance (footcandles) |
Task Illuminance (lux) |
Panels, primary operating area |
50 |
538 |
Auxiliary panels |
50 |
538 |
Scale indicator reading |
50 |
538 |
Seated operator stations |
100 |
1080 |
Reading: – handwritten (pencil)
|
100 50 10 |
1080 536 108 |
Writing and data recording |
100 |
1080 |
Maintenance and wiring areas |
50 |
536 |
Emergency operating lighting |
10 |
108 |
Note: Source is Tables 6.2 and 6.3 in NUREG/CR-5680 (O’Hara et al., 1994).