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From: Randy Hamblin (no email)
Date: Wed Dec 03 2003 - 08:21:25 EST
Test for DC and AC unbalanced currents separately.
You can look for unbalanced current in the shore power chord by putting
a clamp meter around the shore power chord, with the shore power chord
connected and the power turned off at the shore power breaker. You have
to do a series of tests with all combinations of AC and DC breakers on
and off. Better yet is where one configures a shore power chord that
separates the line, neutral, and ground wires so you can put the meter
around each line within the shore power chord and test each line
separately.
You should test the corrosion potential between a reference anode
(connect a solver/silver chloride reference electrode - West Marine
Model 296584 for example) and the vessel ground with the shore power
chord connected and the shore power chord connected and the shore power
turned off at the shore breaker. I think (here is where a good corrosion
engineer is needed) but I think the proper range is between -0.750 Vdc
and -0.999 Vdc (closer to right between that is best). Someone
previously asked if you can over-zinc you boat. Yes, ad this is how you
can tell.
It could be your boat and/or the dock electrical system.
Randy Hamblin
M/Y SAGA
Willard 36
Seattle, WA
-----Original Message-----
From:
[mailto:] On Behalf Of Jim
Alexander
Sent: Wednesday, December 03, 2003 3:23 AM
To: TWL
Subject: TWL: Stray current
Arild,
In reading the posts regarding stray current detection it
brings
to mind the fact that my boat, located at my own dock fairly distant
from
any adjacent electrical except for my other dock, seems to have zincs
eaten
at a fairly rapid rate. My situation is that I have a small dock which
includes a boat lift, security light and a/c outlet all on a separate
110v
circuit adjacent and about 50' from my other dock where I have a
continuation of the 110v circuit from the first dock which supplies
another
a/c outlet and security light. Then I have a 220v separate circuit
that
runs to a shore power connection at this second dock. I suspect that if
I
am the victim of stray current, it is my own.
Would a stray current leak in this situation be detectable at
the
electrical meter? In other words, if I shut down all of my household
electrical breakers with the exception of those running to the docks and
then make certain that all a/c breakers on my boat are off, would I be
able
to detect a movement of current through the electric meter?
Jim Alexander, Realtor
Boatless again
Port Charlotte, FL
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