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Old 07-12-2015, 10:37 PM   #1
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30 amp service to 50 amp coach. Sure guard issue?

Currently we have our 2006 Discovery parked in front of friends house. I plugged the coach 50 amp service cord using a 30 amp adapter to the outlet in his garage.

For reasons unknown the Surge Guard model 34560 shows shows a "caution when illuminated" led. Line 1 and Line 2 are also illuminated demonstrating in coming current.
We have confirmed voltage at the house plug .Any ideas where to look next?
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Old 07-12-2015, 11:41 PM   #2
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Disregard for now. It was a late night and we have it figured out. Thanks
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Old 07-13-2015, 07:31 AM   #3
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What was it? Do not keep us in suspense.
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Old 07-14-2015, 08:17 AM   #4
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I am not an electrician so I'll t ry. Basically, the 30 amp outlet in the home had 50 amp service. So when using a 50-30 RV adapter plug , the Surgeguard was seeing voltage on the ground prong and not allow a connection.
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Old 07-14-2015, 01:04 PM   #5
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I suspect he plugged into a 240 volt dryer outlet.
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Old 07-14-2015, 01:31 PM   #6
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Quote:
Originally Posted by LouieL View Post
I am not an electrician so I'll t ry. Basically, the 30 amp outlet in the home had 50 amp service. So when using a 50-30 RV adapter plug , the Surgeguard was seeing voltage on the ground prong and not allow a connection.
Ah, that explaines it.. There are dozens of posts here from folks who plugged into what they THOUGH was a TT-30 but was really installed for a Dryer, or Air Compressor or Welder or other 240 volt device.. Their stories are a bit different from yours.

YOU had a surge guard.. So your total damage was a night without 120vac

They did not... And it cost them Teleisions, converters, microwaves and other electrical or electronc devices ranging from hundreds to in some cases THOUSANDS of dollars in damage.

now..How much did that Surge Guard cost you? Answer: Absolutly FREE, not one cent in fact it just saved you enough to buy two of them!!!!

Glad it worked as designed.
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Old 07-15-2015, 06:20 PM   #7
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yep i have found a few times at "friends" house the 40 or 30 amp dryer or welder plug has two hots on the same line and the surge guard will insist you unplug because it see two hots on a 30 amp three wire line, instead of one hot, one return and a ground
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Old 07-15-2015, 06:53 PM   #8
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Quote:
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I am not an electrician so I'll t ry. Basically, the 30 amp outlet in the home had 50 amp service. So when using a 50-30 RV adapter plug , the Surgeguard was seeing voltage on the ground prong and not allow a connection.
How lucky, you had the surge guard.
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Old 07-15-2015, 11:30 PM   #9
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Yep. That surge protector probably just paid for itself !
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Old 07-21-2015, 10:01 PM   #10
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I would not recommend trying to plug 30 AMPs into 50 amp service. Costly damage to your inverter can occur. You may however be able to purchase a step down adapter from your local RV store. It reduces the the voltage so it's safe to plug into higher amp service. Good Sams might be able to locate a store in your area.


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Old 07-21-2015, 10:09 PM   #11
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I would not recommend trying to plug 30 AMPs into 50 amp service. Costly damage to your inverter can occur. You may however be able to purchase a step down adapter from your local RV store. It reduces the the voltage so it's safe to plug into higher amp service. Good Sams might be able to locate a store in your area.


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It's safe to plug into a 30 amp 120 volt service with a 50 amp rig. We've been doing it for many years now. In fact that's how our Magna is right now.
It's NOT safe to plug into a 30 amp 240 volt service!
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Old 08-22-2015, 09:57 PM   #12
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30 amp service to 50 amp coach. Sure guard issue?

It occurred to me. Most RV power inverters have something called a line conditioner built in. It's like advanced power management. That is why you can use almost any power generator with an RV and not have a problem. The line conditioner compensates for sudden rise or drop in power. Thus use of a 30 amp system on 50 amp service will not harm your RV, because integrated circuitry is designed to deal with this.


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