What distinguishes plenum-rated cables from non-plenum rated cables?

Plenum-rated cables are specifically designed for use in air circulation spaces, such as ductwork or ceilings where air is distributed for heating, ventilation, and air conditioning (HVAC) systems. What sets these cables apart is their construction; they are made from materials that emit minimal smoke and are self-extinguishing, which helps mitigate the risks associated with fire in environments where air circulation is critical. This characteristic is vital because, in the event of a fire, cables can release toxic fumes that can harm occupants or impede evacuation efforts.

In contrast, non-plenum rated cables do not meet these stringent safety standards, making them unsuitable for the same environments. Their construction may not sufficiently limit smoke output or resist flames, posing a significant safety hazard in air-handling spaces. While other options may refer to specific qualities or attributes of cables, they do not relate to the defining characteristics of plenum-rated cables and their intended usage in areas where air circulation occurs.