I need about 30 feet of #18 - 8 conductor thermostat wire so I can add a
humidistat to my system. But Home Depot and all the others only carry 7
conductor. And all the sources of 8 conductor wanna sell me a big spool.
So, does anyone know where I can buy 8-conductor by the foot?

Would appreciate any help!
Injun Ear
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Any electrical supply or HVAC supply house in your area should be able
to help you.