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Old 08-22-2016, 12:29 AM   #1
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125/250 50amp shorepower

I should be able to figure this out but I don't want to tear into the boat to look at the configuration on the shorepower connection on the boat.

The boat has a 125/250 50 amp shorepower connection... When I look at the ac panel there is a double pole breaker that serves as the main disconnect for the ac service. One pole is the neutral the other is hot and feeds the rest of the ac circuit breakers in the panel.... My question is what happens to the other ac leg? the boat does not use 220. It's a 4 wire cord so 220 is at the boat... is the other hot input just not connected at boat? Any one else seen this configuration where 220 is supplied but only 110 is used.
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Old 08-22-2016, 01:14 AM   #2
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Do you have any 220 loads? We do on our DF and Id guess your boat is wired to be 220 capable. Also, our ACs run on the "other leg" even though they are 110.
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Old 08-22-2016, 02:18 AM   #3
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Do you have any 220 loads? We do on our DF and Id guess your boat is wired to be 220 capable. Also, our ACs run on the "other leg" even though they are 110.

There are no 220 loads on the boat. we don't need air cause it's up north. It's certainly 220 capable I just don't have a clue where the other leg terminates or if it just not connected. Thanks for the reply. By the way does your boat have 2 aft water tanks they appear to be about 100 gallons each? We spend a majority of our time about 15 miles west of you.
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Old 08-22-2016, 06:09 AM   #4
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Our vessel has two aft fuel tanks, not water as you have.
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Old 08-22-2016, 07:08 AM   #5
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My guess would be its just not connected.

They use the 240V plug and socket because its robust and common.

You should be OK pulling 50A on one 120v leg.

How do you adapt down to a marina with only a 120V 30A outlet?
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Old 08-22-2016, 07:11 AM   #6
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"Any one else seen this configuration where 220 is supplied but only 110 is used."


Yes - I have seen it often. Most applications have the two legs feed different 'lines' of 110 breakers after the main breaker(s). So each leg feeds one or more sets of devices at 110 each. On many boats that we have had there is also an optional switch that can 'parallel' these spate incoming lines when a single 30 or 50 amp connection is supplied through an adaptor or directly to the boat.
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Old 08-22-2016, 07:14 AM   #7
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My guess, and it's just a guess is that the other leg isn't being used. If you had a boat with air conditioning, there would likely have been a different panel which utilized both legs. If you look at the power feed cable, there may be an unused conductor at the back of the panel for the second leg. My guess is that if you pull the power plug for the boat, you will find no wire in that second leg hole. They most likely use that plug for the amperage and how common it is.

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Old 08-22-2016, 07:33 AM   #8
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Originally Posted by Ka_sea_ta View Post
I should be able to figure this out but I don't want to tear into the boat to look at the configuration on the shorepower connection on the boat.

The boat has a 125/250 50 amp shorepower connection... When I look at the ac panel there is a double pole breaker that serves as the main disconnect for the ac service. One pole is the neutral the other is hot and feeds the rest of the ac circuit breakers in the panel.... My question is what happens to the other ac leg? the boat does not use 220. It's a 4 wire cord so 220 is at the boat... is the other hot input just not connected at boat? Any one else seen this configuration where 220 is supplied but only 110 is used.
this is weird.

No manufacturer would do that, and a 48 foot boat would certainly be a candidate for 2 busses of breakers.

Can you see behind where the shore power inlet is?

My guess, the boat my have originally been 50A 125. The PO may have thought about upgrading and just went ahead with replacing the cord and inlet with the 4 wire setup . This made connectivity at the dock easier and gave future options. Until you have an inlet main breaker that takes 3 poles, 2 hots and a neutral, you are stuck with one leg I think.

I just replaced my panels from 2, 30 amps to 1, 50A 125/250 and am very happy even though the cost was high. You are part of the way there, I would finish up the conversion.

That missing hot could be someplace else...but I think if it isn't in a breaker than can trip the other hot and neutral, you have a dangerous setup...so, I would make sure ASAP.
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Old 08-22-2016, 08:00 AM   #9
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I just replaced my panels from 2, 30 amps to 1, 50A 125/250 and am very happy even though the cost was high. You are part of the way there, I would finish up the conversion..
Have any tips/advice/photos of the refit? We have the same configuration and just this past Friday, discussed changing from 30x2 to a single 50A 125-250 setup.
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Old 08-22-2016, 08:27 AM   #10
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Have any tips/advice/photos of the refit? We have the same configuration and just this past Friday, discussed changing from 30x2 to a single 50A 125-250 setup.
not really...well could be a million things but mostly deciding what your electrical setup ultimately is going to look like.

My biggest change was to split the ac outlets into 6 distinct areas, versus port and starboad. Plus they all went to a sub panel that would be fed from shore or inverter.

Overall cost probably approached $3K, $2500 just for the panels, but worth it as the prewiring, labels, lighting and digital meters all drove up the cost. But 4 screws per panel, and start pulling wires. The panels were from Paneltronics in Miami, Fl.....picked them up at the factory as I was nearby on my winter trip. The panels they made fit my cabinet too, Blue Seas didn't and the quality is very similar, maybe better with Paneltronics.

One other tip...no matter how well you plan your system, if you can leave 2 - 4 spares for at least the DC side, it's a good thing.
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Old 08-22-2016, 09:46 AM   #11
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My guess would be its just not connected.

They use the 240V plug and socket because its robust and common.

You should be OK pulling 50A on one 120v leg.

How do you adapt down to a marina with only a 120V 30A outlet?
This is the problem, the boat has several adapters, and a couple of different SP cordsets wired in different configurations. I just want to keep this simple and safe as possible... 50amp at the dock use the big cordset 30amp use the smaller cordset...
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Old 08-22-2016, 09:53 AM   #12
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Our vessel has two aft fuel tanks, not water as you have.
That would have made more sense to me... But they can do get used to trim the boat...
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Old 08-22-2016, 09:57 AM   #13
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Not to dobut you, but how do you know it is the 4 wire setup and not just a 50 amp 125 cord and ends?

End molded on and labeled 125/250?

Just curious how off the beaten track this setup is/isnt.....
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Old 08-22-2016, 10:01 AM   #14
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Not to dobut you, but how do you know it is the 4 wire setup and not just a 50 amp 125 cord and ends?

End molded on and labeled 125/250?

Just curious how off the beaten track this setup is/isnt.....
Yup 4 wire cordset 125/250 volt connector
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Old 08-22-2016, 10:08 AM   #15
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Yup 4 wire cordset 125/250 volt connector
And not a second panel someplace to take the second hot and neutral and Sunchaser mentioned for secondary loads such as AC?

Sunchaser, do they just jumper the neutral to the second panel?
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Old 08-22-2016, 10:35 AM   #16
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Not to dobut you, but how do you know it is the 4 wire setup and not just a 50 amp 125 cord and ends?

End molded on and labeled 125/250?

Just curious how off the beaten track this setup is/isnt.....
It's an older Asian built boat. It could be so far off track you couldn't even see the beaten track with a telescope.
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Old 08-22-2016, 10:44 AM   #17
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Originally Posted by Ka_sea_ta View Post
This is the problem, the boat has several adapters, and a couple of different SP cordsets wired in different configurations. I just want to keep this simple and safe as possible... 50amp at the dock use the big cordset 30amp use the smaller cordset...
I don't understand the problem. If you have a cord for a 50 amp 120/240 dock pedestal and one for a 30 amp 120 dock pedestal, what's the issue?

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Old 08-22-2016, 10:56 AM   #18
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And not a second panel someplace to take the second hot and neutral and Sunchaser mentioned for secondary loads such as AC?

Sunchaser, do they just jumper the neutral to the second panel?
If there is I haven't been able to find it in 3 years + of ownership... I have to do a little rewiring on the inverter so It's just a few more screws and a couple more scrapes on my arms to verify what I suspect which is the manufacturer just bought 1 kind of shorepower connector for all boats and just didn't connect the other leg if it was a 120 with no additional requirements.
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Old 08-22-2016, 10:57 AM   #19
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I don't understand the problem. If you have a cord for a 50 amp 120/240 dock pedestal and one for a 30 amp 120 dock pedestal, what's the issue?

Ted
Problem is where does the other leg of the 240 terminate...
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Old 08-22-2016, 11:08 AM   #20
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Problem is where does the other leg of the 240 terminate...
Most likely in the boat side plug. The boat side receptacle just has three wires to it and the fourth hot spot is just empty with no wire connected to it.

If you think it might be disconnected in the power cable just plug the cable in at the dock, turn the breaker on and meter the boat end of the cable to see if you have two hot legs.
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