Terry wrote:
I am in the process of getting a 220 boat. I am thinking that if it
takes it takes two phases to make 220 for boat wiring then I can run a
separate pair from the neutral and one phase and make that into 110 for
the boat. I can then install both 220 and 110 plugs on the vessel.
Would like to know if anybody can critique me on this as I am not 100
percent sure.


As Robb pointed out, it would be a good
idea to make sure your 220 volt
equipment will work on 60 Hz.

A slightly tongue-in-cheek suggestion
for a "quick fix" is to use a 250 volt
isolation transformer for the boat's
current wiring, and an additional 125
volt transformer for any 125 volt
circuits you might want to add. Might be
a lot less expensive than a complete
rewiring and the isolation transformer
provides additional benefits.

You could use a single 250 volt
center-tapped isolation transformer
providing you connected either a 125
volt circuit or a 250 volt circuit, but
not both at the same time. I really
don't think this is likely to be a very
satisfactory arrangement.

With regard to isolation transformer
pricing, if you are willing to consider
non-bulletproof designs that don't
satisfy the ABYC belt, suspenders and
hands-in-the-pockets standard, you can
purchase very good isolation
transformers for a reasonable amount.
Last time I checked, only one supplier
of isolation transformers met the ABYC
standards, and that company was on the
committee that wrote the standard.

Anyway, consider insurance and survey
impacts as well as safety when you
contemplate radical rewiring.

Good luck.

Chuck

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