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From: Bob Peterson (no email)
Date: Thu Jan 01 2004 - 21:14:35 EST
Thanks Peter,
The two separate 30-amp connectors are 2" from each other. I haven't had a
chance to trace the wiring, but felt the master switch on the AC panel was a
little strange, providing for accepting 110 VAC from one or the other shore
power connector but not both. Still has me perplexed.
Thanks, Bob Peterson
-----Original Message-----
From: Peter Bennett [mailto:]
Sent: Thursday, January 01, 2004 5:51 PM
To: Bob Peterson;
Subject: Re: TWL: RE: 50amps
Thursday, January 1, 2004, 2:45:26 PM, Bob wrote:
> A related question re twin 30-amp cords and outlets vs. one 50-amp
circuit.
> A boat I looked at the other day had two 30-amp power cords, two
> 30-amp connectors and two "shore power" selections on the master AC
> panel. I'm familiar with the practice of paralleling two 30-amp
> circuits to provide more amperage to the boat, but why then have two
> independent switch settings on the master AC panel, one for "Shore
> Power 1" and the other for "Shore Power 2"? The AC panel has a large
> input selector that can choose "Inverter", "Generator", "Shore Power
> 1", or "Shore Power 2". The point I'm missing is why have separate
> selector settings for SP1 and SP2? I can see paralleling the two
> shore power circuits together, either internally or via an adapter,
> but why if two 30-amp outlets are available on the dock, would the
> builder have provided a means by which to select one or the other 110 VAC
cord, but not both?
> Any ideas?
> Thanks, Bob Peterson
Were the shore power inlets on opposite sides of the boat? I think the
switch setup you describe would make sense in that case - you connect the
shore power cord to whichever inlet is easier or will allow it to reach a
dock outlet.
It the boat is to be set up to use one or both inlets, then somewhat fancy
switching will be required, as the electrical code and ABYC require that
both the hot and neutral conductors from each inlet must be isolated from
the corresponding conductors of the other
inlet. The AC distribution panel would have to be broken into two
sections. If you are using a single inlet, both sections (hot and
neutral) are fed from that inlet, but if you use two inlets, the hot and
neutral of the second section must be disconnected from the first inlet, and
connected to the second.
On further consideration, a four pole four position switch could handle
this, and the "Shore Power 2" label may just be a little misleading. The AC
panel would still be split, but the "Inverter", "Generator", and "Shore
Power 1" positions would feed both sections from the selected source. The
"Shore Power 2" position could feed the two sections of the AC panel from
the two inlets. I suppose that you could arrange the "Inverter" position to
only feed the inverter to one section of the AC panel - so you can't have
the inverter run the water heater or air conditioner.
-- Peter Bennett, VE7CEI Vancouver, B.C., Canada GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver-webpages.com/van-ps _______________________________________________ http://lists.samurai.com/mailman/listinfo/trawler-world-list To Unsubscribe send email to Include the word "Unsubscribe" (and nothing else) in the subject or body of the message.
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