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Originally Posted by bobbecky

The Progressive unit, and we have the 50 amp hardwired one, does not monitor phase to phase voltage, only phase to ground and phase to neutral. It will work with either a 50 amp four wire source or a 30 amp three wire source equally well. It doesn't care how you get your 120 volt legs, whether they are two different legs like a normal 50 amp source or the same 120 volt leg, normally what you would have hooked up to a 30 amp source and with a 30 amp to 50 amp dogbone adapter. Because it doesn't look at the phase to phase voltage, it doesn't see 240 volts, 208 volts, or in the case of a 30 amp source split to feed both hotlegs of a 50 amp trailer, it would see 0 volts, because there is no voltage difference between two like legs. The accidental 240 volts it monitors is when an outlet, whether it is a 30 amp or a 50 amp, has a hot leg and neutral or ground in the wrong place, or as we have seen before when an electrician wires a 30 amp outlet like a dryer outlet with two hotlegs instead of just one 30 amp leg and everything in the rig burns up from 240 volt instead of 120 volts. If you look at the Error Code Chart in the Progressive manual, none of the error codes say anything about phase to phase voltages, only Line 1 Low or High Voltage or Line 2 Low or High Voltage. Hopefully, this answers any questions about what voltages are acceptable in these rigs. And, the photo that I posted earlier in this thread of the label that talks about 208 or 240 volts is what Keystone applied to our trailer below the shore cable connector where the 50 amp shore cable plugs into, and we have been in parks with 208 volts and everything worked as it was supposed to.

Thank you for that explanation and confirmation of what I had stated earlier that I believed. Hopefully, that should clear it up for everyone....myself included.