Which cable type can be used as a substitute for a CL3P cable?

The correct choice, CMP, stands for Communications Multipurpose Plenum and is suitable for environments where fire safety and low smoke production are critical. While CL3P cables can also be used in plenum spaces and are designed to meet specific fire code requirements, CMP cables have a higher rating, indicating they are constructed to minimize flame spread and smoke generation, making them ideal for installation in air-handling spaces.

Substituting a CL3P cable with a CMP cable is appropriate due to the CMP's enhanced safety features and compliance with national fire safety codes. This ensures that the installation meets or exceeds safety standards.

When considering the other options, CL2R and CL3R cables are generally intended for non-plenum spaces and do not meet the same rigorous testing standards for fire safety as CMP cables. CL4P, while also rated for plenum use, does not directly replace a CL3P because it has different specifications and applications. Thus, CMP is the most suitable substitute for a CL3P cable in terms of safety and compliance.