This 500 foot red 18/2 fire alarm / security cable comes in a pullbox. The cable is composed of 2 18 AWG (American Wire Gauge) wires in a twisted configuration inside of a FPLR rated outer jacket. The primary use of this cable is for power limited fire circuits, but it also finds use in the wiring of security systems. (Often one finds the two systems are closely tied together.) Our security/fire alarm cables listed as FPLR (Fire-Power Limited-Riser) meet characteristics defined under UL 1424. This cable is intended for installation in vertical runs which the length exceeds one floor. This is specified in section 760-154(B) of the National Electrical Code ANSI/NFPA 70. These cables also meet UL 1666 meaning that fall within flame-propagation height rules.