What is the primary difference between plenum-rated and non-plenum-rated cables?

The primary difference between plenum-rated and non-plenum-rated cables lies in their design and intended use, particularly regarding safety in installations. Plenum-rated cables are specifically engineered to be installed in air-handling spaces—areas where air circulates for heating and air conditioning systems. These cables have a fire-resistant jacket made of materials that emit lower amounts of smoke and toxic fumes when subjected to fire, thus minimizing health hazards in case of an emergency.

Using plenum-rated cables in these environments is crucial because the risk of fire in air circulation systems is higher, and any cable used must comply with stringent safety standards to protect the occupants of a building. Non-plenum-rated cables, on the other hand, do not meet these specific standards and are generally intended for use in walls, conduits, or other non-air-handling spaces where the risks associated with fire and smoke are lower. This distinction ensures that safety regulations are upheld in the design and installation of cabling systems in various types of buildings.