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Old 03-31-2018, 02:41 PM   #1
Holiday Rambler Owners Club
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Transfer Switch and bad pedestal wiring

I plugged my RV 50 amp into 30 amp service with an adapter. After a few moments buzz from the inverter there appeared to be a flash and pop from the transfer switch.

What I discovered was the pedestal was wired 220v 30 amp instead of 120v. No neutral.

I now have no AC to the coach. I have a new location with 50 amp service. I can confirm AC input from shore and generator to the switch but no output.

I'm guessing it fried the transfer switch and am looking for confirmation.


96 Holiday Rambler Imperial. So older switch and Freedom 20 inverter. Inverter does provide power. But no AC means batteries are not getting charged unless I run the engine.
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Old 03-31-2018, 02:47 PM   #2
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And everyone keeps stressing the importance of having an EMS for a reason...
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Old 03-31-2018, 02:50 PM   #3
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I am guessing you may have fried the items beyond the transfer switch. Sending 220v into systems looking for 120v is bad.
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Old 03-31-2018, 03:21 PM   #4
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Not only is transfer switch toast so will any 'electronics' downstream of transfer switch

Whenever plugging into a AC Power source.....especially for first time....it NEEDS to be verified that is is 120V, has proper ground and neutral.

So simple to do with a voltmeter and can be done automatically with a EMS.
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Old 03-31-2018, 03:22 PM   #5
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The transfer switch should have passed the power without failing but it's going to depend on the make and model of the switch. Some are only energized by power from the generator while others need power for either shore or generator transfer. Either way the big problem is everything else in the coach that was plugged in is probably cooked. Inverter (if it has an internal transfer switch), microwave, TVs, DVD, clock radio, AC/DC converter charger (stand alone or part of an inverter), roof A/C if the thermostat was calling for cooling at the time,,,.

An open neutral at the shore power plug will quickly make for a bad outing. Your costs to fix the damage might be more than what a power protector would have cost. I'm partial to the cord end type. https://www.amazon.com/Surge-Guard-3...CAKZ2SQ9G7JQN7.
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Old 03-31-2018, 03:31 PM   #6
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Tell us what campground this happened in.
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Old 03-31-2018, 03:33 PM   #7
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You should be able to temporarily bypass the transfer switch to see what other damage may be down the line.

A 30 amp RV adaptor will not fit a 30 amp 220 volt outlet. Is it something you made up ?
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Old 03-31-2018, 03:58 PM   #8
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It's obvious that the OP plugged into a standard 30 amp rv outlet with a 50 to 30 adapter but the 30 amp outlet was actually wired for 240 instead of 120. So his rig failed the smoke test. Granted the outlet should have been tested with a meter or surge protector first but I sure would have had some choice words for the campground owner.
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Old 03-31-2018, 04:08 PM   #9
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Originally Posted by saddlesore View Post
And everyone keeps stressing the importance of having an EMS for a reason...
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Old 04-01-2018, 09:58 AM   #10
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Seems to me the CG owner should be fully liable for all damage caused by this.
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Old 04-01-2018, 10:06 AM   #11
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You haven't stated if it was a campground, or a newly installed pedestal at your home. If campground, then they need to spring for cost of repairs. If at home, the electrical installer needs to pay for repairs . . . even if it was you! Give us a little more information please!

Can't emphasis enough the need for a monitoring system. Personally we have a Progressive Industries, but there are others.

It has "refused" to connect to campground power on several occasions, alerting us to a low voltage, or miss-wired pedestal issue. Changed sites and problem with miss-wired pedestal was resolved.

On one of the occasions, there was a reversed ground/neutral. The solution was to move us to a site next door . . . then an hour or so later, a travel trailer pulled into the site we had just vacated . . . which the office had just assigned them. I explained the problem to them, and why it was a safety issue. Demonstrated with a multimeter. They moved to another site, office put ANOTHER RV is that site, I went up, explained the issue, and the potential consequences, then offered to call the local electrical inspector and let HIM explain the problem.

Then they called an electrician, who swapped the neutral and ground, and everything was hunky dory after that . . . .
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switch, transfer switch, wiring

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