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Old 02-20-2012, 12:47 AM   #1
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Shore Power follow-up

So 7 or 8 pages down there was (is) a great thread on shore power. The takeaway from the thread was that we all need a surge protector. In-line or hard mounted, doesn't matter, bottom line is you can't trust the peds. No argument here. And the Progressive EMS unit seemed to be most oft-recommended, somebody even provided a link to the rvupgradestore.

My question is - the unit that was universally recommended, and linked to, was the 30 amp version of the EMS system. Why wouldn't the standard recommendation be the 50 amp version? I am assuming that a 50 amp unit could step down to 30 amps, or 20 if a house plug is all you have, but the lower rated unit (30 amp) would be useless if 50 amps were available. My Endeavor will gladly take a 50 amp line, although I don't run into 50's all that often.

I just picked up this coach last fall and need to purchase a protector before the spring season. Is there something I'm missing?
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Old 02-20-2012, 08:14 AM   #2
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?? Those that recommended 30 amps probably owned 30 amp systems. If yours is a 50 amp, a 30 amp EMS won't do you much good. Having wired our "hard" mounted 50 amp Progressive EMS - a 30 amp EMS could only check one of the two incoming voltage lines. The other would be totally unprotected.
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Old 02-20-2012, 08:24 AM   #3
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By all means, match the Progressive unit to the size of your shore power input. If you have a 50-amp coach, you want a 50-amp Progressive unit. That is what i have and it has saved me on several occasions. It will not allow the coach to be connected if there is anything wrong with power from the pedestal. It will shut the power input to the coach off if it detects any change in pedestal power such as a surge.

It is one of those things you should not leave home without, or connect your coach at home to shore power for that matter.
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Old 02-20-2012, 01:02 PM   #4
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Make sure that whatever 50 amp unit you buy also protects against an open neutral. An open neutral causes the two legs to be 240 volts inside appliances and that does more damage than any surges unless you have a lightening strike.
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Old 02-20-2012, 01:42 PM   #5
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"Make sure that whatever 50 amp unit you buy also protects against an open neutral. An open neutral causes the two legs to be 240 volts inside appliances and that does more damage than any surges unless you have a lightening strike."

which the EMS 50 amp unit does. BTW, is the only difference between the EMS-HW and -LCW model the remote display? At around $50 difference not sure if the convenience is worth it. But then again, its not raining right now :-)
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