Yes the Classic Z's and ZW's are not polarized. But would it not be nice if the Z's both postwar and prewar, had the plugs assigned correctly so when you unplug a non polarized "Z", it could be plugged back in and you know it is phased correctly with the other transformers without having to put some indicator on all your plugs so they do get plugged in correctly or what takes more time, re-phase the transformer. If you are replacing the electric cord, why not take Five extra minutes to perform the repair correctly.
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