Quote:
Originally Posted by Snoking
Biggest issue is plugging the device into a 50amp out outlet with a 30 trailer, as the shore cable and wiring from the trailers inlet to the trailer electrical panel is not protected correctly. We routinely plug in our 50amp TT with and 30 to 50 amp adapter. Just a few minutes ago DW started the microwave while the WH and portable heater were running and we are on a 30AMP outlet. The hardwired PI unit dumped the power based on low voltage.
I see no problem running an adapter on each side of the portable PI unit. The PI unit will still do it's job of looking for open grounds or neutrals, reverse polarity , low or over voltage, freguency etc.
PI units do not error or trip on amperage, that is left to the circuit breakers.
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When you consider that the 25' 30 amp shore power cord is "rated 30 amps" at 50 feet, a 25' length of cord (the length most of us have) will carry somewhere between 34-40 amps for a short time without damage. The 30 amp power center in the trailer is "protected by a 30 amp circuit breaker. Theoretically (I haven't held the wire ends to verify this) if you plug the 30 amp shore power cord into a 50 amp outlet on the campground power pole, once you turn on enough "stuff" in the trailer to draw 30 amps, everything will work as designed. If you overload anything in the trailer and begin drawing 31 amps, the TRAILER main circuit breaker will trip, shutting down all power into the trailer (instantly eliminating ALL potential for overload. Since the shore power cord is rated at 30 amps at 50' long, it will carry more than that since it's only 25' long. Essentially, there's no way to damage the shore power cord or to overload it while attached to the trailer (as long as the trailer 30 amp breaker is functional)...
Of course, if you run over the shore power cord with a lawn mower, intentionally connect it to something drawing 50 amps (without circuit breaker protection) or somehow damage it, then all bets are off. However those are NOT "normal use" of the shore power cord, any adapter and the trailer main power center.
The rest of your post is "spot on" and as you said, the EMS will work as designed without problems.