• Specially designed and color coded for thermostat/HVAC use
• Available in two-, five- and seven-conductor versions
• Choose 20-ga. for runs up to 250 ft. up to 4A and 18-ga. for runs over 200 ft. up to 8A

This color-coded cable is specifically designed for thermostat/HVAC use, allowing you to easily keep track of what color wire operates what function (i.e. Black=Ground, Red=24VAC Return, White=Heat, Green=Fan, Yellow=Compressor, etc.).

For heating only systems, 2-conductor cable is sufficient. Most systems that provide heat and air conditioning require cable with 4 or 5 conductors. Multi-stage systems need cable with upwards of 7 conductors. Use 20-ga. for runs up to 250 ft. up to 4A, 18-ga. for runs over 200 ft. up to 8A.

MARKING	WIRE COLOR CODE (TYP.)	DESCRIPTION
R	Red	Power, 24 VAC transformer
Rc	Red	Power from cooling system, 24 VAC transformer
Rh	Red	Power from heat system, 24 VAC transformer
C	Black/Blue	Common of 24 VAC transformer
W	White	Primary heat call relay
E	Brown	Emergency heat relay
Y	Yellow	Primary cool call relay
Y2	Yellow	Secondary cool call relay
G	Green	Fan relay
O	Orange	Change-over relay to cool relay
B	Blue	Change-over relay to heat relay
A		Heat & Cool active to any relay
L		Emergency heat active lamp
X		System malfunction lamp
P		Defrost control lamp