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what is the standard wiring code for hvac thermostat wiring?

ground - green / neutral - white / orange - ?? / ect.


First off, you must under that a thermostat is low voltage, runs at 24volts and about 18-20 milli-amps of current.

Green is ground which is marked as X or G. White is the neutral of the main leg power source (phase B). Orange and Brown

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