Here's one scenario.
The shore power distribution hardware carries a live 115 volt AC line,
a neutral line and a ground line.

As likely as not, the ground line is connected physically to the
neutral line at some closeby point. (For ALL slips)

Or if not, some misguided owner may connect his neutral lead to ground
return, with much the same effect.

This notional ground may have several volts imposed on it by the
voltage drop in the neutral return.
If you carry the ground on board to a through hull, this potential can
drive a current to the ACTUAL ground (below the water)

Brian W

On 21 Apr 2004 16:49:29 -0700, (Chuck Baier)
wrote:

Thanks for the input from everyone. One thing that is puzzling here.
Each slip is a separate home run to a meter. None of the slips are
interconnected. Each is independent. If this is the case leakage from
other bots on the ground shouldn't affect my zincs. We are looking for
a source that is outside the AC connections. At least that is what I
beleive.


"geneb321" wrote in message ...
There is an excellent article on testing for grounding problems between
shore power and boat at: http://www.yandina.com/electrolysis.htm
Gene
SV Sea Gypsy

"Chuck Baier" wrote in message
om...
Our marina has a problem at some slips with stray current. Some of the
boats are loosing zincs at a fast rate while others are not. Looking
for some help in trying to resolve this and what kind of equipment
will I need. Thanks. Chuck