Which cable type is designed specifically for smoke reduction in buildings?

The correct choice is CMP - Plenum rated cable, as this type of cable is specifically designed to minimize smoke and toxic fumes in the event of a fire. Plenum spaces, which are areas in a building used for air circulation—such as between the ceiling and a dropped ceiling or under a raised floor—often have strict fire safety regulations. Therefore, the materials used in plenum rated cables are made with flame-retardant properties that help reduce the amount of smoke produced, contributing to safer evacuation routes and minimizing health risks during a fire.

In contrast, non-plenum rated cables do not meet the same stringent standards for fire safety in plenum areas and may produce more smoke when exposed to flames. Outdoor rated cables are designed for external use, where weather resistance is the primary concern, rather than smoke reduction. Indoor rated cables might meet safety standards for general indoor environments but would not necessarily provide the same level of smoke reduction or fire safety features as plenum rated cables.