<P> In the event that the dropped ceiling is used as a plenum , low - voltage cables and wiring not installed inside conduit need to use a special low - smoke and low - toxicity wire insulation which will tend to char and stop burning on its own . This helps to protect building occupants so that they are not poisoned with toxic chemicals sucked through the ventilation system in the event of a fire , and helps to prevent fires from spreading inside the hidden plenum space . This special low - smoke cable is typically referred to as plenum cable or Low Smoke Zero Halogen ( LSZH or LS0H ) cable . While twisted pair cable for networking and telephone service is the most common form of plenum cable , coaxial cable also needs to be plenum - rated for safety . </P>
<P> In the event that the dropped ceiling is used as a plenum , low - voltage cables and wiring not installed inside conduit need to use a special low - smoke and low - toxicity wire insulation which will tend to char and stop burning on its own . This helps to protect building occupants so that they are not poisoned with toxic chemicals sucked through the ventilation system in the event of a fire , and helps to prevent fires from spreading inside the hidden plenum space . This special low - smoke cable is typically referred to as plenum cable or Low Smoke Zero Halogen ( LSZH or LS0H ) cable . While twisted pair cable for networking and telephone service is the most common form of plenum cable , coaxial cable also needs to be plenum - rated for safety . </P>
which type of cable might be required for installation in a drop ceiling
which type of cable might be required for installation in a drop ceiling
plenum
plenum