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Old 06-05-2014, 10:16 PM   #1
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Another Surge Protector Question

I received my Progressive Industries EMS-PT30C today. I had an assumption that I think now is a good time to verify...
There have been a few times I've arrived at a campground only to find the 30amp service plug a little questionable and/or "used"... So I pull out my 50-to-30amp converter and plug into the 50amp service.
So my first question... Is there any advantage/disadvantage to doing this?
The question on my assumption... Will I be able to plug my 50-to-30amp converter into the pedestal, then plug my EMS into the converter, and finally my 30amp power cord into the EMS? Disadvantages/concerns to doing this?
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Old 06-05-2014, 10:21 PM   #2
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no reason you can't. You can't "force" more power into RV. Amps are "drawn", and you can't exceed the breaker in the RV so no worries
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Old 06-05-2014, 11:17 PM   #3
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Advantage of having all the 30 amps available at your breaker, instead of less from a weak cg 30amp breaker plus other losses from conections and cords (although the latter two should be minimal).
I've never to this day used a 30 amp plug, even when I had a 30 amp trailer I always used the 50 amp service and a dog bone.
(And I rarely had trailer breaker issues on my 30amp trailer, unless I tried to run the ac, microwave, tv, and h2o heater all at the same time)

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Old 06-05-2014, 11:22 PM   #4
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Oh and on 50 you wont have to worry quite as much that someone hooked it up wrong . Cause its wired the same as what most 240v appliances use.
A lot of people wire up 30 amp 3 prongs wrong.

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Old 06-06-2014, 07:11 AM   #5
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So.. you don't need anything to 'step down' from 50 to 30? Just get a 'dogbone' with a 50a male on one end and a 30a female on the other?
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Old 06-06-2014, 07:14 AM   #6
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Quote:
Originally Posted by dave961 View Post
So.. you don't need anything to 'step down' from 50 to 30? Just get a 'dogbone' with a 50a male on one end and a 30a female on the other?
Correct....

30 Amp RV Female to 50 Amp 125/250V RV Male Pigtail Adapter with Pull Handles - Furrion IP3154R-SB - Electrical Adapters - Camping World
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Old 06-06-2014, 07:22 AM   #7
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Quote:
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So.. you don't need anything to 'step down' from 50 to 30? Just get a 'dogbone' with a 50a male on one end and a 30a female on the other?
Yep just like the dog bone im the middle of this pic

You can get them at Walmart for about $16 - 17

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Old 06-06-2014, 07:56 AM   #8
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Quote:
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Yep just like the dog bone im the middle of this pic

You can get them at Walmart for about $16 - 17

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Awesome... The exact set-up I have.
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Old 06-06-2014, 08:12 AM   #9
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For completeness only:

There is are potential situations were using the 50 amp outlet via pigtail on a 30 amp camper can get you into trouble.

While your camper's main breaker "should" prevent you from pulling more than 30 amps into the camper (because it is supposed to open at 30), it takes a time for the breaker to heat up enough to open. That amount of time is dependent on the degree of overload.

For example, a 30 amp breaker should open almost immediately when a dead short occurs (a few hundreds of amps instant); but an overload of an amp or three could take a long time (several minutes even). Same with the pedestal breaker.

In the short run, this is a "good thing" because it allows "micro-overloads" (say from starting the compressor on the air conditioner while using other stuff in the camper) from tripping the breaker all the time.

When it becomes an issue, is when the power panel is "seeing" a full load of 30 amps and your wiring, sockets, cord(s), and plug (all rated for 30 amps) are "seeing" significantly more.

This can easily happen with:

1) Extension cords. Folks with 30 amp campers buy 30 amp extension cords to extend their OEM cord's reach when needed. This is not a problem on a 30 amp outlet because the amperage used to push its way to the camper "can not" exceed the 30 amp breaker on the pedestal and will open first protecting your cords and connections.

However if you use a "dogbone" adapter on the pedestal's 50 amp socket, then connect your power cord(s); the cords and connections are not protected and they may be operating continuously in an overloaded condition. This can result in cord damage, connection damage from heat and arcing inside the connector.

2) You use a 30 amp rated auto-transformer. Auto-transformers work by using a small amount of incoming current to boost low voltage at the pedestal (various causes) to near normal to prevent damage to the camper's inductive items (air conditioner, fan motor, microwave) when low voltage is encountered.

Since auto-transformers are installed before the power center and have their own internal current limiters, the wiring between the auto-transformer and the 50 amp outlet will be unprotected from continuous small degree (potentially large) overload.
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Old 06-06-2014, 08:18 AM   #10
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Add one note to what Herk said. I was working on my friends recently purchased 2000 Coleman Pup. I had to pull apart his power center, due to no 12 volts (converter fried). Comes to find out, his power center/converter, which is not made any longer, did NOT have a main breaker. He had a 20 amp breaker for his AC and a 15 amp for his converter and plugs. If he uses an adapter, he could pull 35 amps. On a setup like this, I would not recommend a 50 to 30.

I myself carry one, and use it when I can.
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