Texas Fire Alarm License Practice Test

What type of cable can be installed in ducts, plenums, or spaces used for environmental air?

1. Riser cable

2. General purpose cable

3. Plenum cable

4. Low smoke cable

The correct answer is: Plenum cable

Plenum cable is specifically designed to be used in spaces such as ducts, plenums, or other areas that are utilized for environmental air circulation. This type of cable is constructed with materials that have low flammability and produce minimal smoke, which is crucial in maintaining safety and reducing hazards in air handling spaces. In buildings, these plenum spaces are often integral to the heating, ventilation, and air conditioning (HVAC) systems. Because of the potential for fire to spread quickly through these spaces, using plenum-rated cables is essential in complying with safety standards and regulations. These cables help minimize the risk of fire and the potential harmful effects of smoke and toxic fumes in the event of a fire. Other cable types, such as riser cables, are meant for vertical spaces and do not have the same fire safety characteristics for horizontal spaces like plenums. General purpose cable lacks the necessary low flame and smoke-producing qualities required for use in such environments. While low smoke cable can be beneficial in various applications, it is not specifically rated for use in plenums where air is circulated.