How many conductors do I need for my thermostat?

Choose thermostat wire based on your HVAC system and terminal count. Basic systems may use 2–4 conductors, while many thermostats use 5. Check requirements before selecting 18/2 through 18/10.

Does a smart thermostat require a C-wire?

Many smart thermostats use a C-wire for continuous 24V power, but requirements vary by thermostat and HVAC system. Check the manufacturer’s wiring instructions before choosing thermostat wire.

What does CL3R / CMR riser-rated mean?

CL3R/CMR thermostat wire is riser-rated for approved vertical runs between floors and through riser spaces, with flame-spread performance suited for riser applications. Follow NEC and local codes.

Can this thermostat wire be used outdoors?

This sunlight-resistant thermostat wire may be used for above-ground outdoor installations where permitted. It is not direct-burial cable. Use a direct-burial rated cable for underground installations.

Can CL3R / CMR thermostat wire be used in plenum spaces?

Not where CMP plenum-rated cable is required. CL3R/CMR thermostat wire is riser-rated, while CMP cable is intended for plenum and environmental air spaces. Follow applicable local codes.

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Syston 18/4 Thermostat Doorbell HVAC Heating Control Cable Wire, 100% Solid Copper Conductors CL3R/FT4/CMR Riser-Rated UL/ETL Listed, UV Resistant RoHS for Indoor/Outdoor Low Voltage Applications Use

Product ID: 286053942

Details

Brand
Syston Cable
Color
Brown
Gauge
18
Material
Copper
Number of Cable Strands
Multi Strand

🔌300V Power-Limited Circuit

☀️UV & Sunlight Resistant

🛠️Easy Pull & Rip Cord Jacket

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Description

⚡ Wire Smart, Live Smart — Power Your Space with Confidence!

BUILT TO BRAVE THE ELEMENTS - UV resistant and RoHS compliant for safe indoor/outdoor use without compromise.
INSTALLATION MADE EFFORTLESS - Smooth, round jacket with rip cord ensures quick, hassle-free setup even in tight spaces.
VERSATILE LOW VOLTAGE APPLICATIONS - Ideal for thermostats, doorbells, alarms, intercoms, and more—future-proof your wiring needs.
RATED FOR 300 V POWER LIMITED CIRCUITS - Supports up to 300 watts, perfect for demanding HVAC and control systems.
PURE COPPER CONDUCTORS FOR MAXIMUM EFFICIENCY - Experience unmatched conductivity and reliability with 100% solid copper wiring.

The Syston 18/4 Thermostat Doorbell HVAC Cable features 100% solid copper conductors rated for 300 volts, ensuring superior conductivity and durability. Its UV-resistant, RoHS-compliant jacket is designed for both indoor and outdoor low-voltage applications, while the installation-friendly design with a rip cord makes setup seamless. UL/ETL listed and riser-rated, this cable is engineered to meet professional standards for HVAC, security, and control systems.

Specifications

ASIN	B07FPN1RZX
Best Sellers Rank	#6,059 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #31 in Electrical Wire
Brand	Syston Cable Technology
Brand Name	Syston Cable Technology
Color	Brown
Customer Reviews	4.5 out of 5 stars 80 Reviews
Gauge	18
Manufacturer	Syston Cable Technology
Material	Copper
Material Type	Copper
Model	7232
Number Of Wires	4
Number of Cable Strands	Multi Strand
Number of Items	1
Number of Packs	1
Part Number	7232-SP-BN-500
Strands	Multi Strand
Unit Count	500 Feet
Voltage	300 volts
Wire Diameter	0.16 inches

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408612CFA

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In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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