Master Electrician Practice Exam

What is the maximum temperature that adjacent combustible material can be subjected to, according to installation requirements for luminaires?

1. 80 degrees C

2. 90 degrees C

3. 100 degrees C

4. 110 degrees C

The correct answer is: 90 degrees C

The maximum temperature that adjacent combustible materials can be subjected to is set to ensure safety and prevent fire hazards. According to the National Electrical Code (NEC), luminaires are usually evaluated to ensure that their surface temperatures do not exceed a certain threshold when in operation. The limit of 90 degrees Celsius reflects a careful balance between ensuring adequate illumination and minimizing the risk of igniting any nearby combustible materials. This requirement is critical in environments where luminaires are installed near flammable materials, as temperatures exceeding this threshold could compromise safety. The choice of 90 degrees Celsius is based on extensive testing and safety standards to protect both the installation and the occupants.