Amazon.com: Cables Direct Online 500ft Stranded 18/2 Alarm CCA FPT Shielded Cable for Low Voltage LED, Burglar System, Fire Detector, Security Station, Door Bell, 18AWG 2 Conductors Wire : Electronics
General Cable E2032S.18.10 :: Multi-Conductor Cable, 18/2 Shielded, Gray, 500' :: Rexel USA
18 AWG 2/C Solid Fplp Plenum Rated Shielded Fire Alarm Cable Red