Re: [Amel Yacht Owners] 30 Amp 125 volt shore power to 50 Amp 125/250 Volt plug?

Bill & Judy Rouse <yahoogroups@...>


I am not an electrician, and do not want to be your electrician via email. The reason is that you may rely on something that I say and I might be wrong. 

But, I will make these comments as long as you recognize the above statement. Unfortunately, it is difficult to make the following short, because I feel I should make these comments as clear as possible.

I believe that what the transformer company is saying when they say "IF” the marina has a Split Phase," is that If the marina 110-125VAC 60htz shore power connections that derive their power from "1 leg or phase" of a 220-250VAC 60htz connection, it will work. However, this does not tell you how to make the connection. And, what I do not know is what it will take to make it work without making assumptions. And, I do not know if the transformer is is designed to take different inputs and still output 220-250VAC60htz. So, from this point forward, I am assuming (guessing) that your tranformer requires 220-250VAC input. I might be wrong on that assumption and if I am, almost everything that follows is WRONG.

Europe and the US have Single Phase 220-250VAC power. Europe delivers this power to the user in three wires including earth. The wires are 220-250VAC (hot) (brown), Return or Neutral (neutral) (blue) and earth. The US "SPLITS THE 220-250VAC into 2 legs or 2 Phase and deliver the power with 4 wires including earth. The wires are 110-125VAC (hot) (red), 110-125VAC (hot) (black), Return or Neutral (neutral) (white) and earth. Many 220-250VAC devices will work with 50 or 60htz and take the voltage split or not split.BUT NOT ALL DEVICES.

I suspect (guess) that the transformer is NOT a multiple voltage input transformer and what they intend to say is that you can wire 2 different "legs" (phase) of the 110-125VAC 60htz to the transformer, wiring one leg (red) to your Brown wire input and one leg (black) to the Blue wire input, and finally Earth (NOT WHITE) to your green/yellow input. In this case, you will not use the white from shore.

That said, if you are discussing Tortola, BVI, I am 99.9999% sure that they have 220-250VAC on the docks, but maybe (assume) that they may not have a US Type 50 amp 220-250VAC plug. AND maybe (guess) they have only wired the pedestals with US type 110-125VAC 60htz 30 amp connectors. If that is the case, when they say they do not have the larger 50 amp connectors, the split connection device will work, maybe (guess), but each of the 30 amp plugs needs to receive power from separate legs (phase) of the 220-250VAC power. I posted a link earlier of a device that has 2 each 30 amp male connectors and 1 50 amp female. I have one on the boat. It is possible that you could make one, but you will have to follow instructions precisely. Without giving you the instructions now, let me describe what the marina probably (guess) has:

Inside their pedestal box they I think (assume) that they have a large input cable with 4 wires inside the cable. They should be color-coded this way:
  • Red - 110-125VAC 60htz (hot)
  • Black - 110-125VAC 60htz (hot)
  • White - Neutral
  • Green - Ground
I believe (guess) that you need to accomplish the following:
  • Red - 110-125VAC 60htz (hot)>>>>>>>>Brown input on transformer
  • Black - 110-125VAC 60htz (hot)>>>>>>>Blue on input transformer
  • White - Neutral>>>>>>>>>>>>>>>>>>>Not used
  • Green - Ground>>>>>>>>>>>>>>>>>>Green/Yellow input on transformer
It will not work if you use either 2 Reds or 2 Blacks which would be using 2 of the same leg (phase) of the 220-250VAC 60htz. You MUST use 2 different legs...this is what they sometimes refer to a "phase."

The best way to accomplish this is for the marina to wire a female US Type 50 Amp 220-250VAC 60htz receptacle for you to plug into. If they do, I would test to make sure that the resulting wiring is according to the Shore Power graphic in the following album.

I will repeat that I am not an electrician, and even if I was, there is no way I can help you without making assumptions like I did above and those assumptions could be wrong.

BeBe 387

On Mon, Oct 17, 2016 at 7:45 PM, Alexandre Uster von Baar uster@... [amelyachtowners] <amelyachtowners@...> wrote:


Hello Bill (Rouse),

My Transformer is Original (option) from Amel, just never been used. I can only hope the wiring was done accordingly to:
blue wire goes to the neutral connection, brown wire goes to the hot and green/yellow goes to ground.

I am honestly not sure an “electrician” could be useful, in the only 4 years that I own my boat, I have noted that 2/3 of the people I hired did not do a proper job, nor knew anything… and I keep seeing that for other boat owners…

Marinco has confirm as well the link I mentioned will not work.
When I mentioned the 2 x 30 Amp 125 Volt going to a 50 Amp 125/250 Volt, they say it would work “IF” the marina has a Split Phase, but I doubt the marina knew about that…

Unfortunately that small marina in Tortola (Harbourview), so far only has 30 amp… this will be a first for me as well.
I have been asking them for 1 week, the answer is: we are working on it… kind of reminds me of the Bahamas…

Bill (Kinney),
I know about my second shore power going to the Transformer, but since it has never been used since installed 16 years ago, I don’t know if it is working… and in my case, when I arrive somewhere i do have to work right away for my clients (need electricity, etc.). so no time for down time which Island people don’t understand…
So now, I am just looking for back up alternatives…

I have ask the marina is it was 50 Amp 125 Volt or 50 Amp 125/250 Volt, they were not able to answer…

Sincerely, Alexandre

On Mon, 10/17/16, 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners] <> wrote:

Subject: Re: [Amel Yacht Owners] 30 Amp 125 volt shore power to 50 Amp 125/250 Volt plug?
To: "" <>
Date: Monday, October 17, 2016, 10:28 AM


Alex, No, that will not help.

Without knowing what
transformer you have and how it was wired...and if that
wiring has changed, none of us can give you much
I suggest that before
you arrive at a marina that only has 110VAC available, that
you consult with an electrician and have him inspect what
you have.
was never in a marina that had only 110VAC 60htz
available...they all had 110VAC and 220VAC 60
You have my
wiring graphic for wiring to 220VAC 60htz without an onboard
transformer. If not it is in this album:
On Mon, Oct 17, 2016 at
10:10 AM, Alexandre Uster von Baar uster@...
[amelyachtowners] <>


Good morning,

The next marina I am going to is likely to only have 30 Amp
125 Volt.

Since I have never used my big transformer on the boat, I am
not sure it works, so trying to cover options.

I need 220 volt.

I am very ignorant when it comes to electricity…

Would the following product be ok?
product/389365F/pigtail-shore- power-adapter-30a-125v-male-

Or is there a problem with the phases or something else…

I am not concerned with the Amp, but the voltage…

Thanks in advance!

Sincerely, Alexandre


Club Nautico de San Juan, Puerto Rico

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