125/250v shorepower question - Page 2 - SailNet Community
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post #11 of 23 Old 04-15-2015 Thread Starter
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Re: 125/250v shorepower question

Yup. I think you deserve a cookie now. Did you cut and paste that from my response a few back or did you read up a bit yourself? Btw, abyc e-11 doesn't answer my question unfortunately.
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post #12 of 23 Old 04-15-2015
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Re: 125/250v shorepower question

Quote:
Originally Posted by mitiempo View Post
A 50 amp 125/250 shorepower connection will give you 50 [email protected] volts using both hot legs or 50 amps @125 volts using only one leg.
Exactly!

Don't know where this 30A business came from, unless the responders above were thinking about a splitter. These are in common use and have 30A connectors on each "leg", but they depend on 30A breakers on the boat to keep things happy. It's actually possible to pull 50A from each "leg" of a splitter....dangerous stuff. And, if you loose a neutral, Katie bar the door :-)

Bill

Last edited by btrayfors; 04-15-2015 at 05:21 PM.
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post #13 of 23 Old 04-15-2015
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Re: 125/250v shorepower question

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Originally Posted by Letrappes View Post
abyc e-11 doesn't answer my question unfortunately.
E-11 relates to the boat, not the land based supply.

50 amp 125 volt is wired the same on the boat as 30 amp 125 volt - the exception being the size of the double pole breaker. Each has 3 wires - hot (black) neutral (white) and ground (green).

50 amp 250 volts is a 4 wire system with 2 hots, a neutral, and a ground.

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post #14 of 23 Old 04-15-2015
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Re: 125/250v shorepower question

Sorry you didn't like the answers.

Whenever I do something on my boat, I do my homework and learn, as well as asking questions.

In over 17 years of being on the internet doing boating stuff, I have never flipped the bird at folks who are trying to teach me something.

If you don't understand the wires and what they mean, you most likely already know that they can be dangerous.

We're actually trying to help you.

By simply suggesting that you find a source of reputable information and go from there.

Good luck, but in electrical stuff, luck should have nothing to do with it.

Your boat, your choice.

Stu Jackson, Catalina 34, 1986, M25 engine, Rocna 10 (22#), Maple Bay, BC, Canada
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post #15 of 23 Old 04-15-2015
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Re: 125/250v shorepower question

My post#4 was a simple attempt at humour. Just a single phase I'm going through. Thought it was apparent. I guess that messing with boats while handicapped with a serious learning disability can be a problem.

Last edited by Capt Len; 04-16-2015 at 02:49 AM.
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post #16 of 23 Old 04-16-2015
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Re: 125/250v shorepower question

Quote:
Originally Posted by Letrappes View Post
It's plugged into a normal 125/250v 50a outlet on the dock so I'm pretty sure the boat is getting the full 50a @ 125v. I'm really wondering if this is acceptable by ABYC.
In most marinas a "normal" 50 amp connection is a four wire (three plus the big metal shell in the connector.) That makes it 220V 3 phase as stated above.

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post #17 of 23 Old 04-16-2015
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Re: 125/250v shorepower question

220 volt service for boats is 1 phase, not 3 phase.

Here are the configurations:
Attached Thumbnails
50_125.jpg   Connectors.jpg  

Brian
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post #18 of 23 Old 04-16-2015
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Re: 125/250v shorepower question

125/250V service on marine outlets is Single Phase, not Three Phase. 250 is actually 125-0-125, basically the same as (most) North American residential power. You get 125V from either Line to Neutral, and 250V across the two Line wires.

It's Three-Wire, but not Three Phase (which is a very very different animal).

So it's possible that a 125/250 inlet was wired for one side only. The issue is that the shore-side supply will be fused (breakered) at 50A, so the boat's internal wiring better be rated for that right up to its panel, or protected at 30A very close to the inlet.

If one frequents areas where all the pedestals are 125/250/50A, it's one way to avoid hanging an adapter on the cord, and probably safer if installed correctly (see above).

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post #19 of 23 Old 04-18-2015
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Re: 125/250v shorepower question

I think this thread is a great example of why you shouldn't use forums for information. Redline is correct, what the OP has is a 208/230 single phase supply but with power only on one phase. It is still 50 amps on the hot leg whether there are two or only a single hot conductor. Free advice is worth what you pay for it.
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post #20 of 23 Old 04-18-2015
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Re: 125/250v shorepower question

Not even ,Rocky Single phase was all that is available. This is 220v single phase, split into 2 legs of 110 each. If the breaker is 50 amps that's what you can get regardless of the voltage So one hot , one neutral and one ground for 110. If there are two hots it's 220 between them and the boat had better be wired for it. And the boater should have a good understanding of what's what . Lots of really obvious misunderstanding and it's not a matter to joke about. Hav en't a clue what yachty rule book says but common sense should trump.
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