120 posts 12-18-2017 11:16am
If this means that the "hot" slot is consistently the shorter one (across all outlets used for my audio system) then I can get a "polarity tester" and check it.
That should be a given. IF the output of the transformer/s is wired correctly as a Grounded Power System.
What I am talking about if you use a volt meter and insert one test lead probe in the Hot contact slot of the outlet fed from the output of one transformer, and insert the other test lead probe in the Hot contact slot of the outlet on the output of another transformer you should measure zero volt nominal volts. That means the two secondary windings are in phase with each other. If you measure 240V then they are out of phase with each other. Same test can be preformed from the output of the transformer to the Hot contact of the mains wall receptacle outlet. Zero volt nominal in phase, 240V nominal out of phase.