{"product_id":"syston-18-5-thermostat-control-cable-solid-copper-cl3r-300v","title":"Syston 18\/5 Thermostat Control Cable - Solid Copper, CL3R 300V","description":"\u003cp\u003eIn this review the Syston 18\/5 Thermostat Doorbell HVAC cable is presented for homeowners and installers who need a reliable, low-voltage control wire that performs indoors and outdoors. The bottom line: it is best for wiring thermostats, doorbells and low-voltage control systems because of its \u003cstrong\u003esolid pure copper conductors\u003c\/strong\u003e and CL3R 300V rating which combine to deliver dependable conductivity and safety for long runs and mixed HVAC and security setups.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e18 AWG, 5 conductors:\u003c\/strong\u003e Provides multiple dedicated runs in a single jacket for thermostats, doorbells and signal systems without splicing separate cables.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePure copper conductors:\u003c\/strong\u003e Solid copper cores ensure maximum conductivity and long-term reliability compared with copper-clad alternatives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300V CL3R rating:\u003c\/strong\u003e Class 3 power-limited insulation and a 300V rating give a high safety margin for low-voltage thermostat and security wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRiser-rated construction:\u003c\/strong\u003e CM Riser (CL3R\/FT4\/CMR) jacket meets common building requirements for riser applications in multi-level installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV and sunlight resistant:\u003c\/strong\u003e Jacket rated to UL 1581 sunlight resistance allows safe use in exposed outdoor runs or where sunlight may reach the cable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation-friendly jacket:\u003c\/strong\u003e Smooth, round jacket and included rip cord make the cable easy to pull through walls and remove without damaging conductors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis cable is ideal for HVAC technicians, electricians and DIY homeowners who are wiring thermostats, smart thermostat systems, doorbells, annunciators, intercoms and low-voltage security circuits. The solid copper cores and CL3R rating make it a sensible choice when reliability and compliance are important.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include installers needing stranded, highly flexible conductors for constant-motion applications or those requiring ultra-thin bundle cable for very tight conduit; this product prioritizes solid conductor reliability over extreme flexibility.\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\u003eSolid copper conductors deliver consistent conductivity and durability for long-term use.\u003c\/li\u003e\n\u003cli\u003e300V CL3R and riser-rated jacket provide strong safety and code-friendly installation options.\u003c\/li\u003e\n\u003cli\u003eEasy-to-pull round jacket and rip cord speeds up installation in walls and conduit.\u003c\/li\u003e\n\u003cli\u003eUV resistance and RoHS compliance allow safe outdoor use without harmful substances.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolid 18 AWG conductors are less flexible than stranded wire, which can make tight bends or moving applications harder.\u003c\/li\u003e\n\u003cli\u003eSome users report mixed impressions of thickness compared with cheaper alternatives, so expectations on feel may vary.\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 pure copper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGauge\u003c\/td\u003e\n\u003ctd\u003e18 AWG, 5 conductors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e300V (CL3 rated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJacket Rating\u003c\/td\u003e\n\u003ctd\u003eCL3R \/ FT4 \/ CMR riser-rated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSunlight Resistance\u003c\/td\u003e\n\u003ctd\u003eUL 1581 sunlight resistant (UV resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoHS\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\/5 thermostat cable is a practical, value-oriented choice for anyone wiring thermostats, doorbells or other low-voltage control systems who wants the reliability of \u003cstrong\u003esolid copper\u003c\/strong\u003e conductors and a 300V CL3R safety rating. It balances durability, code-friendly construction and outdoor readiness, making it a smart pick for most residential and light commercial installations.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this cable be used outdoors?\u003c\/strong\u003e\u003cbr\u003eYes; the jacket is sunlight resistant to UL 1581 standards and suitable for exposed outdoor runs where UV exposure may occur.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this cable suitable for smart thermostats?\u003c\/strong\u003e\u003cbr\u003eYes; the solid copper conductors and 18 AWG size provide reliable connectivity for smart thermostats and associated control circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the cable flexible enough for tight conduit runs?\u003c\/strong\u003e\u003cbr\u003eIt is reasonably easy to pull due to its round slick jacket, but as a solid conductor cable it will be less flexible than stranded alternatives and can be harder in very tight bends.\u003c\/p\u003e","brand":"Syston Cable Technology","offers":[{"title":"Default Title","offer_id":48264669921499,"sku":"B0BRNYK6F5","price":103.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51BKS9LxbAL._SL1500_77ced7c6-af70-42c3-9cc8-1e7fa641f5ad.jpg?v=1778314122","url":"https:\/\/gearmusthave.com\/products\/syston-18-5-thermostat-control-cable-solid-copper-cl3r-300v","provider":"GearMustHave","version":"1.0","type":"link"}