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Old 03-21-2014, 07:11 PM   #1
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50 amp to 30 amp adapter?

Does anyone have experience with an adapter that lets you plug a 30 amp cord into a 50 amp receptacle? Are they safe?

We're stopping at a location that only has 50 amp service available, and we have 30 amp service. I'll buy an adapter if they are safe, but I have a portable generator I can use if the adapters cause problems.

Thanks in advance.
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Old 03-21-2014, 07:29 PM   #2
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I wouldn't

The other way makes sense, where the maximum current from the source is fused at 30 amps, going through a 50 amp rated wire, but I would never allow a potential of 50 amp draw run through a 30 amp wire.

That has fire hazard written all over it.
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Old 03-21-2014, 07:31 PM   #3
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Usually , when the CG says 50 amp service, the electrical box has all three: 50, 30 and 20 amp receptacles


I've never seen a connection that only has a 50 amp plug
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Old 03-21-2014, 07:36 PM   #4
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I have one like this:
http://www.amazon.com/Voltec-16-0050...amp+rv+adapter

Some people like to plug into the 50amp service because they are usually less worn than the 30amp receptacles. I have only connected that way once, and I think it was for 4 nights with the AC running and had no issues.
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Old 03-21-2014, 08:10 PM   #5
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You'll find many newer or upgraded campgrounds that can supply this for you. Your TT will have breakers that will limit how much you draw so they will trip first before you exceed the amount of current your main cable can stand.
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Old 03-21-2014, 08:25 PM   #6
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Originally Posted by dalenoel View Post
You'll find many newer or upgraded campgrounds that can supply this for you. Your TT will have breakers that will limit how much you draw so they will trip first before you exceed the amount of current your main cable can stand.
X2 You will not overload your cord. We used a 50 to 30 adapter for years when we had a 30 amp rig.
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Old 03-21-2014, 08:31 PM   #7
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I wouldn't

The other way makes sense, where the maximum current from the source is fused at 30 amps, going through a 50 amp rated wire, but I would never allow a potential of 50 amp draw run through a 30 amp wire.

That has fire hazard written all over it.
I would.

Your trailer has a 30 amp main breaker at the converter doesn't it? If the load inside your trailer exceeds 30 amps it will trip protecting the downstream (load) and the upstream (line) wire. If your 30 amp cord is plugged into a 50 amp receptacle and a tree branch falls on your shore power cord shorting the hot to ground or neutral the breaker will trip once again protecting the wire.

The 18 gauge wire on your table lamp in the living room is plugged into a 15 or 20 amp circuit that far exceeds the ampacity of the lamp cord but you have been living that way for how many years?
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Old 03-21-2014, 09:20 PM   #8
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I own an adapter but have never used it. In my opinion it is not as safe as using the proper socket. Some say you are protected, because you have a 30 amp breaker in the tt. I disagree, as the cord between the tt breaker panel and the electrical post has the potential of 50 amps power draw and it is not rated for that much current. In reality the the only issue would be from a short in the power cord not tripping the breaker soon enough to protect you from a potential fire.
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Old 03-21-2014, 11:07 PM   #9
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I would.

Your trailer has a 30 amp main breaker at the converter doesn't it? If the load inside your trailer exceeds 30 amps it will trip protecting the downstream (load) and the upstream (line) wire. If your 30 amp cord is plugged into a 50 amp receptacle and a tree branch falls on your shore power cord shorting the hot to ground or neutral the breaker will trip once again protecting the wire.

The 18 gauge wire on your table lamp in the living room is plugged into a 15 or 20 amp circuit that far exceeds the ampacity of the lamp cord but you have been living that way for how many years?

Interesting. Hadn't thought about it that way. The lamp itself only draws an amp or so, but it's the same principle: smaller gauge downstream from higher possible supply

Still makes me cringe a bit
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Old 03-22-2014, 12:16 AM   #10
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I have one from Amazon. They are safe. What would not be safe is what other people have done which is they don't want to pay for or store a 50 amp cord so they use a 50 to 30 amp adapter to run a 30 amp extension cord then a 30 amp to 50 amp adapter. This is unsafe because you are actually drawing 50 amps (single phase) through a 30 amp cord. Since you have a 30 amp RV you can only pull 30 amps through the load center. It doesn't matter what you are plugged into as long as it is the correct voltage.
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