Which cable type has the strictest fire code requirements?

Plenum cable is designed for use in spaces that are used for air circulation for heating and air conditioning systems, known as plenum spaces. These areas often include the space above a ceiling or below a raised floor where air circulation occurs. The strictest fire code requirements apply to plenum cable because if a fire were to occur in these spaces, the potential for flame and toxic smoke spread is significantly higher since air circulation systems can distribute heat and smoke quickly throughout a building.

To meet fire safety regulations, plenum cables are constructed with materials that have low smoke production and self-extinguishing properties. This minimizes the risk of fire and smoke spreading in the event of a fire, which is essential for protecting occupants and allowing for safe evacuation. Other cable types, such as standard PVC or non-plenum cables, do not have these stringent requirements, making them less suitable for installation in plenum spaces. Thus, plenum cable is the correct choice due to its enhanced fire safety features tailored for high-risk environments.