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Read our privacy policyHeavy-duty 500-foot spool of 18-gauge 6-conductor thermostat wire designed for low-voltage HVAC control applications, multi-stage heating and cooling systems, heat pumps, and smart thermostat installations. Class 2 power-limited circuit cable featuring a durable brown jacket for quick identification and a riser rating for running cable safely between floors. Ideal for standard residential setups requiring extra conductors for advanced system controls.