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Old 21-07-2014, 19:41   #1
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30 amp ext cord to 50 amp outlet jerry-rig

How can you plug in a 30 amp extention cord into the marina's 50 amp outlet? They both have 3 prongs, so if I file one of the little side-legs off the 30 amp male plug, then it should fit in the 50 amp outlet, but which terminal goes in which hole? Anyone ever tried this?

Another thing to consider: If this is possible, before I try it, I need to make sure it's 110 volts.
But what about phase? What's the difference between the different phases available at marinas? Should I be concerned about phase?

I don't intend to operate anything more than 200 watts, so, I won't have a draw big enough to cause a fire.
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Old 21-07-2014, 19:57   #2
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

Buy the right adapter; cheaper in the long run to do it right...
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Old 21-07-2014, 20:26   #3
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Buy the right adapter; cheaper in the long run to do it right...
+1 and if you're in a marina it's not fair to everyone else to Mickey Mouse it
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Old 21-07-2014, 20:27   #4
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

I keep an adapter in the bag with my 30amp cord for those times when only 50 amp is available. They aren't too expensive.
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Old 22-07-2014, 08:29   #5
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

Buy the adapter. Don't put others' lives at risk.
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Old 22-07-2014, 08:39   #6
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

I've only rarely been to a Marina with 50 amp only service, and when I did, they had an adapter they let me borrow, before you bugger up your cord and remove the self locking feature, ask
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Old 22-07-2014, 08:40   #7
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

You sound like you don't have a clue how the Magic fire works....pay the cash for the adapter, you could damage your boat, as well as all this around you with stray currents if you screw this up.
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Old 22-07-2014, 08:47   #8
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

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You sound like you don't have a clue how the Magic fire works....pay the cash for the adapter, you could damage your boat, as well as all this around you with stray currents if you screw this up.


The stats say most boat fires are ...electrical issues..... blah...blah...blah..

Most electrica fire are started by a misunderstanding of electricity (simple as it might be) and the mis-application of it or jury rigging it instead of a satisfactory home built that meets the same safety standards.
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Old 22-07-2014, 09:11   #9
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

LiveaboardL:
Please let us know which marina you are in. You are going to kill someone.
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Old 22-07-2014, 09:45   #10
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

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LiveaboardL:
Please let us know which marina you are in. You are going to kill someone.
Guy's, relax, I don't think he's done anything, just asked a question is all.
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Old 22-07-2014, 09:52   #11
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

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Guy's, relax, I don't think he's done anything, just asked a question is all.
You can relax if you choose, I don't want him in a slip next to me.
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Old 22-07-2014, 09:55   #12
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

If I remember right the spacing of the prongs is also on a larger radius, so simply filing off the prongs to shape still wont work.
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Old 22-07-2014, 09:57   #13
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

There are two different types of 50's. The most common are the 240/120 volt 50's, and the less common are 120 volt 50's. If you look at the marina's outlet and see that two of the contacts have the bend in them it is the more common type. And no you do not need to be concerned about phases. Three phase circuits do exist, but you are not likely to see one in your marina. You would not confuse it with what you are looking for if you do encounter one.

One such adapter is a Marinco 121A see it here.
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Old 22-07-2014, 11:19   #14
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Re: 30 amp ext cord to 50 amp outlet jerry-rig

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LiveaboardL:
Please let us know which marina you are in. You are going to kill someone.
+ Infinity. Go back and look at some of his other threads. They almost all have something to do with jury rigging things to get by on the cheap with no apparent intent to ever perform a permanent repair.

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