ICC Residential Electrical Inspectors Practice Exam

What is the minimum surface area of combustible wall or ceiling finish that requires noncombustible cover?

1. 150 square inches

2. 180 square inches

3. 200 square inches

4. 250 square inches

The correct answer is: 180 square inches

The minimum surface area of combustible wall or ceiling finish that requires a noncombustible cover is established to enhance safety standards in electrical installations. When the area exceeds 180 square inches, it poses a higher risk for fire spread if the combustible materials are not properly protected. The regulation sets this threshold to ensure that larger areas are adequately safeguarded by noncombustible materials to limit potential fire hazards. Choosing 180 square inches as the correct requirement ensures that any significant amount of combustible material is effectively covered, thus minimizing the risk of ignition and fire propagation in residential settings. This regulation is part of the larger framework of building codes designed to protect public safety and is essential for ensuring that preventative measures are in place where they are most-needed.