lszh cable might be required for networking or telephone installation in a drop ceiling.
lszh cable might be required for networking or telephone installation in a drop ceiling.
what type of cable might be required for networking or telephone installation in a drop ceiling?
lszh
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.
dropped ceiling
on july 10, 2006 at approximately 11 p.m. four three-ton sections of a concrete drop ceiling inside the i-90 fort point channel tunnel leading to the ted williams tunnel collapsed. a section of ceiling fell on top of a car traveling through the connector tunnel, killing 38-year-old passenger milena del valle and slightly injuring her husband angel del valle, who was driving. the cause of the collapse was later determined to be the failure of adhesives connecting a steel tieback suspending the concrete drop ceiling to the main ceiling above.
ted williams tunnel