Question

How does electronic devices using dc reverse polarity?

Answer 1

I have searched the archieves and determined its best to ask the experts on this one.
Simply reversing AC+ and a Neutral in a toaster or light socket creates a shock hazard, but the device might still work.

I have a traffic signal utility cabinet that has the following electronic devices in it & would like to know what effects reverse polarity might have on them: the circuitry starts with a 120vac/ 60 amp surge suppressor, Mercury contact switch, 24vdc Bus Interface Unit (BIU,) a series of 12 load switches that convert 12vdc to 120vac, (4) 120vac field transfer relays, 24vdc microprocessor, 12vdc/24vdc power supply with a huge capacitor. That's the short list.
Besides unstable operation, is there a way to tell this unit has been backfed?

I should add that Neutral and a Green (grd) circuits coming from the power meter (utility) service are bound all the way around a traffic signal intersection (all 4 corners.)
This particulay utility cabinet was installed with the AC+ connected to the Neutral from the meter, and the meter Neutral connected to the AC+. The ground wire was connected correctly.
Any insight on past expeience is appreciated.
Dave

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