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Old 05-15-2019, 06:12 PM   #21
JRTJH
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Originally Posted by Logan X View Post
So if Iím understanding correctly, the trailerís circuit breakers will protect the trailer from an amperage overload, the EMS will protect from a voltage overload (and all of the other above mentioned problems). That makes sense.
You are correct. Plus, all the things that x-rated (Vern) listed are conditions and features of MOST EMS units. They all do "about the same thing" and now, Surge-Guard and PI offer "lifetime warranty" on their units, so they are "more alike than ever before".....
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Old 05-15-2019, 06:21 PM   #22
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Originally Posted by Snoking View Post
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.
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.
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Old 05-16-2019, 05:36 AM   #23
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Circuit breakers are there for more than a single reason, along with electrical codes. Yes the 30 Amp main breaker in the power center will protect from overloads within the unit down stream of the panel. It will not protect one from a problem up stream of the power center that is supplied with wiring rated for 30amps and is feed from a 50amp supply.

In life beyound RVs this would be a code violation. Example would be a sub panel in your garage wired with #10 wire from a 50amp breaker in main panel. Red tag, failed inspection.

People just need to be aware of the risk no matter how small, as their lives could depend on it. Example could be a loose connection on a lead comimg in to the trailer at the inlet or panel that created enough heat to melt to insulation on the wires and allow a short to occur.
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