Class 2 cables intended for environmental air spaces should be marked as:

Class 2 cables intended for environmental air spaces should be marked as:

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

Answer: (B)

In spaces that handle environmental air, cables must be labeled to show they’re suitable for plenums. The marking that communicates this is Class 2 with a plenum rating, which is written as CL2P. Here, CL2 confirms it’s a Class 2 (power‑limited) circuit, and the P shows the jacket is rated for plenum spaces, meeting the stricter flame and smoke requirements of environmental air spaces. The option that omits the plenum designation wouldn’t signal compatibility with plenums, while a designation that uses a riser qualifier isn’t appropriate for environmental air spaces. A mark combining multiple qualifiers isn’t the standard used for this requirement in many codes. So, CL2P is the correct marking because it explicitly indicates Class 2 and plenum suitability for environmental air spaces.

In spaces that handle environmental air, cables must be labeled to show they’re suitable for plenums. The marking that communicates this is Class 2 with a plenum rating, which is written as CL2P. Here, CL2 confirms it’s a Class 2 (power‑limited) circuit, and the P shows the jacket is rated for plenum spaces, meeting the stricter flame and smoke requirements of environmental air spaces.

The option that omits the plenum designation wouldn’t signal compatibility with plenums, while a designation that uses a riser qualifier isn’t appropriate for environmental air spaces. A mark combining multiple qualifiers isn’t the standard used for this requirement in many codes.

So, CL2P is the correct marking because it explicitly indicates Class 2 and plenum suitability for environmental air spaces.