On Mon, 17 Mar 2014 18:01:06 -0400, david@righthere... wrote:

I've been on 30A 120V power at the dock for years and would now like to upgrade
to 50A 220V, or what they refer to as 50A 250V at the marina office. I haven't
put a meter on it yet but so far suspect it's closer to 220 than 250. The socket
on the pedestal is like the one pictured he

http://www.catagle.com/68-153/CWD_Ar...uyersGuide.htm

They say it's 3-pole 4-wire. I'm guessing X and Y are the two hot legs and W is
the neutral. Between X or Y and W would be 120V+/- and between X and Y is the
220/250V. Right? How does the ground tie into it though? With only 3 poles do we
run a separate wire from the boat to the pedestal, and if so how do we tie in?

Also can anyone suggest the cheapest place to get a plug like that? So far the
best price I've found is $68.18 he

http://www.ktool.net/servlet/the-581...-63CR65/Detail

Thank you for any help!
David

If you are currently getting 120 V on the 30 amp outlet, you should
get 120 V from each hot to neutral on the 50 amp outlet, and 240 volts
between the two hot wires.

If the dock outlets are supplied three-phase power, you may get 208
volts between the hot wires, but most marinas should provide single
phase 120/240 to the dock outlets, although the marina's main supply
will be three-phase.


--
Peter Bennett, VE7CEI Vancouver BC
peterbb (at) telus.net
Vancouver Power Squadron: http://vancouver.powersquadron.ca