{"product_id":"18-4-alarm-wire-shielded-plenum-cable-100ft-reliable-security-wiring","title":"18\/4 Alarm Wire Shielded Plenum Cable 100FT - Reliable Security Wiring","description":"\u003cp\u003eIn this review of the 18\/4 Alarm Wire Shielded Plenum Cable 100FT, the bottom line is simple: this cable is built for installers and DIYers who need a flexible, plenum-rated solution for security, access control and low-voltage audio or communication lines. The reviewer found the stranded pure copper conductors and aluminium foil shielding deliver reliable conductivity and predictable performance, while the CMP\/CL3P\/ FPLP plenum jacket adds a meaningful safety advantage for in-ceiling or plenum installs. For anyone wiring alarm panels, intercoms or PA systems where fire rating matters, this cable is worth considering.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100 ft length:\u003c\/strong\u003e Provides a practical single-roll length for running multiple zones or a long run without splicing, reducing installation time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStranded pure copper conductors:\u003c\/strong\u003e Offer lower resistance and better conductivity than CCA, which helps maintain signal integrity in alarm and access control circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielded with aluminium foil:\u003c\/strong\u003e Reduces electromagnetic interference for clearer audio and more reliable communication lines in noisy electrical environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCMP\/CL3P\/FPLP plenum jacket:\u003c\/strong\u003e Flame-retardant jacket material gives added safety for plenum spaces and meets stricter building requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300 V rating and temperature range:\u003c\/strong\u003e Rated to 300 V and usable from -10C to 90C, making it suitable for most indoor low-voltage installations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis cable targets electricians, system integrators and building maintenance staff who install fire alarms, burglar alarms, access control, intercoms and public address systems and want a plenum-rated, shielded option. The stranded construction makes routing through conduit, cable tray and tight corners easier than solid conductors, which speeds installs and reduces breakage.\u003c\/p\u003e\u003cp\u003eLess appropriate users include those who need outdoor direct-burial cable or heavy power wiring; the cable is intended for low-voltage indoor use and plenum spaces rather than exterior exposure or mains power runs.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eStranded bare copper provides strong conductivity and flexibility for neat installs.\u003c\/li\u003e\n\u003cli\u003ePlenum-rated jacket (CMP\/CL3P\/FPLP) improves fire safety in ceiling and air-handling spaces.\u003c\/li\u003e\n\u003cli\u003eAluminium foil shielding reduces interference for audio and communication lines.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eNot designed for outdoor or direct-burial applications, so additional protection is needed for exterior runs.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e100 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductor\u003c\/td\u003e\n\u003ctd\u003e18 AWG stranded bare copper, 4 conductors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShielding\u003c\/td\u003e\n\u003ctd\u003eAluminium foil shield\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage rating\u003c\/td\u003e\n\u003ctd\u003e300 V (CL3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature rating\u003c\/td\u003e\n\u003ctd\u003e-10C to 90C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJacket rating\u003c\/td\u003e\n\u003ctd\u003eCMP \/ CL3P \/ FPLP plenum-rated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax conductor DC resistance\u003c\/td\u003e\n\u003ctd\u003e22.4 ohm\/km at 20C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe 18\/4 Alarm Wire Shielded Plenum Cable 100FT is a practical, cost-effective choice for indoor low-voltage installs where flexibility, shielding and plenum fire performance matter. Installers will appreciate the stranded copper for routing and the foil shield for cleaner signals, while the CMP-rated jacket provides added safety in ceiling and air-handling spaces, making it good value for professional alarm and access control work.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eIs this cable suitable for fire alarm systems?\u003c\/strong\u003e\u003cbr\u003eYes, it is designed for low-voltage fire alarm and security wiring and carries a 300 V CL3P rating with plenum flame-retardant jacket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this cable be used outdoors?\u003c\/strong\u003e\u003cbr\u003eNo, the cable is intended for indoor use; outdoors or direct-burial runs require specialty outdoor-rated cable or additional weatherproofing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the shielding help with audio and intercom lines?\u003c\/strong\u003e\u003cbr\u003eYes, the aluminium foil shield reduces electromagnetic interference, which improves signal clarity for audio, intercom and communication circuits.\u003c\/p\u003e","brand":"MOOKEERF","offers":[{"title":"Default Title","offer_id":48610683519195,"sku":"B0DLNKKRLG","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71wTOkqkNzL._SL1500.jpg?v=1778569222","url":"https:\/\/gearmusthave.com\/products\/18-4-alarm-wire-shielded-plenum-cable-100ft-reliable-security-wiring","provider":"GearMustHave","version":"1.0","type":"link"}