Master Electrician Practice Exam

A thermal barrier is required if the space between resistors and combustible material is less than what distance?

1. 6 inches

2. 9 inches

3. 12 inches

4. 15 inches

The correct answer is: 12 inches

A thermal barrier is required to prevent overheating and potential fire hazards when the distance between resistors and combustible materials is minimal. In scenarios where this distance is less than 12 inches, the risk of heat transfer to combustible materials increases significantly. The 12-inch requirement ensures that there is adequate space for heat dissipation and mitigates the risk of ignition. Proper adherence to this guideline helps maintain a safe distance, ultimately protecting both the electrical components and surrounding materials. While other distances may be mentioned in context, 12 inches is established as the critical threshold for ensuring safety in these applications.