Riser (CMR) Security Alarm Cable - 18/4 AWG, CL3R, Stranded (7 Strand), Unshielded, 1000ft, GrayDescription 18 4 CMR Unshielded Alarm Cable for Residential & Commercial Security Systems Product Highlights The Riser (CMR) Security Alarm Cable comprises 18 4 AWG Bare Copper 7 Strand Conductors, unshielded with a PVC jacket, suitable for Security Systems, Intercom Systems, Sound Audio Systems, and Power Limited Controls. ETL listed and RoHS compliant, it's available in 1000' increments. Our Bulk Security Alarm Cables, also known as alarm wire, are