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Olds
The same thing in my world. 12 volt systems are usually DC. I've never seen 12 volts AC.
The 12 VDC is explicit; telling you what expect. 12 volts alone is more vague. Low voltage A.C. around the house is found in doorbell and home thermostat systems, although those are typically higher.
Arcs_n_Sparks
Thanks!