ICC Permit Technician Practice Exam

Where artificial light is provided in lieu of natural light, the code requires a minimum average illumination of ___ footcandle(s) over the area of the room at a height of 30 inches above the floor level.

1. 20

2. 40

3. 1

4. 10

The correct answer is: 10

The code specifies a minimum average illumination requirement of 10 footcandles for areas where artificial light is used instead of natural light. This standard is rooted in ensuring that spaces have sufficient lighting for safe and effective use, taking into account the activities that typically occur in those areas. Setting the illumination level at 10 footcandles provides a basic yet effective level of lighting for most general tasks, allowing occupants to see clearly and perform activities without strain. It serves as a foundational baseline that can be exceeded in environments requiring higher lighting levels for specific tasks, but it ensures that even minimal lighting meets a standard for safety and functionality. In contrast, the other options suggest much higher illumination levels that may not be necessary for all spaces, which can lead to issues such as unnecessary energy consumption or glare. Thus, adhering to the specified 10 footcandles helps create a balance between adequate visibility and energy efficiency.