CEDIA ESPA EST Practice Test

Answer - A - The wires that are installed above a ceiling must be plenum rated.

Key Takeaway: Plenum-rated cables have a jacket that meets specific ANSI requirements to be flame retardant and have low smoke production. The idea behind the plenum rating is that if the cable catches fire, the Plenum cabling will not burn as easily as a standard PVC jacket and will produce less smoke than a typical non-plenum cable if it does catch fire. Plenum-rated cable is about three times the cost of regular PVC-jacketed CAT5e cable.