Which marking indicates Class 2 wiring suitable for environmental air spaces?

Which marking indicates Class 2 wiring suitable for environmental air spaces?

• A. Cl2
• B. Cl2P
• C. Cl2R
• D. Cl2PR

Answer: (B)

Cables installed in environmental air spaces must have a plenum-rated jacket. The P suffix on a Class 2 cable marking indicates this plenum rating, meaning the jacket is designed to meet the stricter flame propagation and smoke requirements of plenum (environmental air) spaces. Class 2 describes the circuit’s power rating, but it doesn’t by itself specify where the cable can be run. Therefore, the marking that shows suitability for environmental air spaces is CL2P. The other markings either lack the plenum rating or specify other, non-plenum uses (like riser-only), so they don’t guarantee suitability for environmental air spaces.

Cables installed in environmental air spaces must have a plenum-rated jacket. The P suffix on a Class 2 cable marking indicates this plenum rating, meaning the jacket is designed to meet the stricter flame propagation and smoke requirements of plenum (environmental air) spaces. Class 2 describes the circuit’s power rating, but it doesn’t by itself specify where the cable can be run. Therefore, the marking that shows suitability for environmental air spaces is CL2P. The other markings either lack the plenum rating or specify other, non-plenum uses (like riser-only), so they don’t guarantee suitability for environmental air spaces.