Switch faceplates must be made of which material?

• A. Nonmetallic insulating, noncombustible material
• B. Metallic, conductive material
• C. Wood
• D. Glass

Answer: (A)

Safety from electric shock and fire is the key idea here. Switch faceplates should not conduct electricity and should resist ignition. A nonmetallic insulating, noncombustible material does both: it won't carry current to your fingers and it won't easily burn if there’s heat or a fault inside the switch. This makes it the safest choice for handling live electrical components.

Metallic, conductive materials can carry current to the surface, increasing the risk of shock and arcing. Wood is combustible and can burn, adding fire risk. Glass is noncombustible but can be brittle and prone to cracking, which can create safety issues and maintenance problems.