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


Alexandre Uster von Baar
 

Hello Bill,

Thanks for your time, but this was not my question.
I probably did not explain myself properly…

I know about the 4 wires, etc. on my 50 Amp 125/250 Volt. It bring power directly to my 220 volt Breaker box.

I also know about the 3 wires of the 110 Volt 30 Amp shore power cord going to my original Step up transformer.
Since the transformer has never been used, I was wondering if I could use the device on the link I used. Actually from other source the answer is NO.

Now I was looking at the following
http://www.marinco.com/en/153ay
wondering if there is a problem with phase or anything else.

Sincerely, Alexandre




--------------------------------------------

On Mon, 10/17/16, Bill Kinney greatketch@... [amelyachtowners] <amelyachtowners@...> wrote:

Subject: Re: [Amel Yacht Owners] 30 Amp 125 volt shore power to 50 Amp 125/250 Volt plug?
To: amelyachtowners@...
Date: Monday, October 17, 2016, 9:59 AM


 









Alexandre,
My boat also has the transformer.
and having just redone the power cord, I know in detail how
MY boat was wired for the 125 volt inlet cord.  This
assumes that your existing cord with the 50 Amp connector is
wired to bring 125 volts to the transformer.  This is the
way my boat is wired. 
It is possible that the 50
A-125/250 volt cord was wired to bring 250 volts directly
into the Amel electrical system.  If THAT is true, then the
following is NOT true….

That is the correct adapter to
make the connection.
USA marinas offer a very
confusing number of electrical options. Compounded by the
fact that we talk about 110 volts, 115 volts, 120 volts and
125 volts all for the same thing!
The 50 Amp 125/250 volt plug in
the USA is a 4 wire plug.  It has a ground, connected to a
metal rim, a neutral, and two hots connected to the three
pins.  The two hot wires are 180 degrees out of phase, so
between the two of them is 250 volts, and from each of those
to the neutral wire is 125 volts.
On my boat, there was a 50 A
125/250 V plug on the end of the cord.  ONE of the hot wire
pins was connected, along with the neutral and ground to
bring 125 volt service on three wires in the boat to the
transformer. The other hot wire was not connected.
30 A/125 V service is a 3 wire
service.  One hot, one neutral, and one ground.  The
adapter will connect the hot wire from the supply to BOTH
hot wires in the 50 AMP plug.  Connected like this, each
hot wire is 125volts to the neutral, and 0 volts to each
other. The functional result on the boat is the same as
plugging into a 50A-125/250V plug connected with three
wires.
I hope that helps!

Bill KinneySM #160, HarmonieAnnapolis, MD“Ships and men rot in
port."http://fetchinketch.net






On Oct 17, 2016, at 10:10,
Alexandre Uster von Baar uster@...
[amelyachtowners] <amelyachtowners@...>
wrote:

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?
http://www.go2marine.com/product/389365F/pigtail-shore-power-adapter-30a-125v-male-to-50a-125-250v-female.html
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
SM2K
#289 NIKIMAT
Club
Nautico de San Juan, Puerto Rico











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