{"product_id":"18-awg-thermostat-cable-300v-cl3r-ft4-cmr-solid-copper-wire","title":"18 AWG Thermostat Cable 300V CL3R\/FT4 CMR - Solid Copper Wire","description":"\u003cp\u003eIn this review the Syston 18 AWG thermostat cable is evaluated for homeowners, HVAC installers, and DIYers who need a reliable low-voltage conductor for thermostats, doorbells, or security gear. The single biggest reason to consider this cable is its use of 100% solid pure copper conductors combined with a 300V CL3 rating and sunlight-resistant jacket, which together deliver trustworthy conductivity and durability for indoor and outdoor runs. For anyone replacing older aluminum or cheap tinned-wire thermostat runs, this cable promises noticeably better conductivity and longevity.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid Pure Copper Conductors:\u003c\/strong\u003e Provides consistently low resistance for thermostats and transformers so sensors and smart thermostats operate reliably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300V CL3 Rating:\u003c\/strong\u003e Class 3 power-limited 300V insulation gives a high safety margin for low-voltage control and signal applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation-Friendly Jacket:\u003c\/strong\u003e Round slick jacket with smooth edges and a rip cord makes pulling through walls and conduit easier and quicker.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSunlight Resistant:\u003c\/strong\u003e Meets outdoor UV resistance requirements so runs exposed to indirect sunlight or attic access remain serviceable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoHS Compliant:\u003c\/strong\u003e Manufactured without restricted hazardous substances, reducing environmental impact for installers and homeowners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Applications:\u003c\/strong\u003e Sized and rated for thermostats, doorbells, intercoms, alarms, annunciators and other low-voltage signal tasks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe cable is aimed at homeowners upgrading thermostat wiring, HVAC professionals running new control circuits, and handymen wiring doorbells or alarm sensors who want a fully copper conductor rather than copper-clad alternatives. Its 18 AWG size and 300V CL3 rating make it suitable for runs that need a robust, code-friendly cable instead of thin patch wire.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include installers who require multiconductor shielded cable for audio or RF-sensitive runs, or projects needing stranded conductors for highly flexible temporary leads. Also, if you need non-UV indoor-only decorative cable, this heavy-duty jacket may be more than required.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-quality \u003cstrong\u003esolid copper\u003c\/strong\u003e conductors that improve conductivity and long-term reliability over cheaper alternatives.\u003c\/li\u003e\n\u003cli\u003e300V CL3 rating and riser-rated construction that supports safe low-voltage control applications.\u003c\/li\u003e\n\u003cli\u003eInstallation-friendly design with slick jacket and rip cord that eases pulls through walls and conduit.\u003c\/li\u003e\n\u003cli\u003eSunlight resistant and RoHS compliant for outdoor use and reduced environmental concern.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWire thickness reports are mixed; some find it thicker than expected while others expect a more flexible stranded option for tight bends.\u003c\/li\u003e\n\u003cli\u003eNot intended for high-voltage or shielded signal applications, so it is limited to low-voltage control and signaling.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductor\u003c\/td\u003e\n\u003ctd\u003e100% solid copper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGauge\u003c\/td\u003e\n\u003ctd\u003e18 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e300V (CL3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRatings\u003c\/td\u003e\n\u003ctd\u003eCL3R\/FT4\/CMR riser-rated, UL\/ETL listed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSunlight Resistance\u003c\/td\u003e\n\u003ctd\u003eUV resistant for outdoor use (meets UL 1581 requirement)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eRoHS compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Syston 18 AWG thermostat cable is a practical choice for anyone who needs dependable low-voltage wiring for thermostats, doorbells, alarms, or intercoms. Its solid copper conductors, 300V CL3 rating, and installation-friendly jacket deliver a dependable, code-conscious cable that represents good value for long-term reliability; just choose a stranded or shielded alternative where flexibility or noise rejection is required.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this wire outdoors?\u003c\/strong\u003e\u003cbr\u003eYes, the jacket is sunlight resistant and suitable for outdoor low-voltage runs when installed per code.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this cable compatible with smart thermostats and doorbell transformers?\u003c\/strong\u003e\u003cbr\u003eYes, the solid copper conductors and 18 AWG gauge work well with smart thermostats and typical doorbell transformers for reliable connectivity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this cable have a rip cord for stripping?\u003c\/strong\u003e\u003cbr\u003eYes, the jacket includes a rip cord to simplify jacket removal during installation.\u003c\/p\u003e","brand":"Syston Cable Technology","offers":[{"title":"Default Title","offer_id":48202972725467,"sku":"B0D7CJGNCS","price":157.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/5189-3yF0cL._SL1500_6c1d2c56-873b-46a9-a58d-ed9b00f1ebf9.jpg?v=1770235302","url":"https:\/\/gearmusthave.com\/products\/18-awg-thermostat-cable-300v-cl3r-ft4-cmr-solid-copper-wire","provider":"GearMustHave","version":"1.0","type":"link"}