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what are the voltages used for the [low voltage] transformers used in HVAC that wire to thermostats and taco zone valves or other equipment? Are they all "24VAC" or are there also 26, 28, 30, 40... volt ones?
I am NOT asking about the VA (volt-amp) rating.
In probing various places with a meter, I am reading 26 to 30 volts I'm guessing induced voltage?