1000 foot Copper 18/2 Gray Stranded Security/Alarm Wire Pull Box, CM/Inwall rated. Our 1000 foot gray 18 AWG (American Wire Gauge) 2 conductor stranded security/alarm wire comes in easy to use pull boxes. This wire is CM / in-wall rated; it is not intended for plenum or riser situations. This security wire is designed for use in security/alarm systems. It is typically used for connecting motion sensors, keypads, magnetic contacts, glass breaks (acoustic detectors), smoke detectors, communicators, sounders/strobes, entry management and control panels in such systems. When wiring a system please be sure to consult the manufacturers' recommendations for wire conductors, gauge and expected resistance.