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Old 22-01-2017, 14:28   #16
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Join Date: Oct 2009
Location: Redondo Beach, CA
Boat: 1990 Oyster 55
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Re: Shorepower Voltage/Amp Difference Question

Originally Posted by Scott Berg View Post
Remember that the wire is sized for the amps, not the volts, so a 120v 50amp cable could handle 240 (or 480) as well.

Most US Marinas have 50a 125/250v four wire circuits:

Green = Ground
Black = Line 1
Red = Line 2
White = Neutral (Grounded)
All voltages are max ratings, actual will be 117 and 238 or so

125 volts Black to White
125 volts Red to White
250 volts Red to Black

the Green (grounding) wire will be connected to the White (grounded) wire at the shoreside transformer but NOT on the boat.

In Europe you'll see 16 and 32 amp three wire systems carrying 230 amps... but that's another post!
In many US marinas black to red is 208v as the two lines are 120 degrees out of phase rather than 180 degrees out of phase.

Just something to know about when planning a system.

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