Questions tagged [common-wire]

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3 votes
1 answer
98 views

Can neutrals be landed in an old panel which acts as a junction box?

I have a metered panel which had been stripped down and wires jumped over to new panel. The feed is still here but also jumped over. Can I land my neutrals from the new panel inside of the old main ...
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2 votes
2 answers
224 views

Which Circuit Does this Switchbox Common Wire Belong To?

I'm replacing a single-pole switch with a Lutron Caseta, in a switch box that houses two switches, each on a different circuit. The old switch that I've removed was connected to two wires: line (red ...
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0 votes
1 answer
44 views

C terminal voltage on AC control panel

My smart thermostat shut itself down reportedly (as it ran some time on internal chargeable battery and I browsed through the settings) because the C terminal stopped receiving 24V power supply. That ...
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  • 6,451
0 votes
1 answer
191 views

Can I connect my thermostat's R and C wires directly to the transformer?

One day my parent's furnace and thermostat stopped working. The thermostat is a smart thermostat that depends on 24volts to the R and C wire. We measured voltage between the R and C wire and was ...
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1 vote
1 answer
9k views

Where do I connect the C wire in my furnace?

I am upgrading my thermostat to a Nest, and would like to add a common wire. My current furnace controller doesn't have a C terminal, but the current thermostat wire has 2 unused wires (black and blue)...
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  • 11