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102808_CAPAC_MANUAL_MODEL_90W12D_SYSTEM.doc
SPECIAL INSTRUCTIONS TO OWNER
Check to see that the Capastic epoxy plastic shield has been
applied to metal and wood hulls around each anode as described on
page 9. This shield must be properly installed fro proper operation of
the CAPAC
®
system and to prevent damage to the hull.
CAUTION NOTICE
A. The CAPAC
®
Monitor is an accessory panel mounted meter assembly,
which serves as a means of checking the operation of the 90W12D
system. One of the design features of the monitor is a push button
switch located on its front panel. The purpose of this switch is to
connect the meter to reference electrode only when a check of the
system is being made. Do not disable this switch and wire the meter
directly to the reference electrode. To do so would cause the
reference electrode signal to be gradually attenuated resulting in
excessive current being impressed upon the hull causing possible
damage due to overprotection.
B. On vessels equipped to receive shore power, the vessel’s hull and or
ground system is electrically connected to the shore-based grounding
system by way of the shore power grounding conductor. On a vessel
without either sacrifical anodes or an impressed current cathodic
protection system corrosion of the hull and appendages will be
increased according to the metallic composition of the shore-based
grounds. If the vessel is equipped with sacrifical anodes their
effectiveness is greatly reduced and they are rapidly consumed. If the
vessel is equipped with an impress current cathodic protection system
such as CAPAC
®
the impressed current cathodic protection system
will probably be overloaded in an attempt to protect the shore-based
ground system. This can result in, 1) overprotection of the hull near
the anodes(s), 2) under protection of the hull areas remote from the
anode(s) and 3) damage to the vessel’s paint and /or hull near the
anode(s). Under these conditions the hull potential readings taken by
a reference electrode in the system or a portable hull potential meter
will not be truly representative of the hull potential over the entire
surface of the hull due to the distortion of the current distribution field
on the surface of the hull. If the vessel receives shore power,
measures must be taken to isolate the hull from the shore-based
ground system. Such isolation may be provided by either an isolation
transformer or a galvanic isolator such as a Capac
®
Galvanic Isolator
P/N50830. Refer to the American Boat and Yacht Council publication
(latest revision) “Safety Standards for Small Craft”, sections E-2 and #-
8, for additional information concerning cathodic protection hull
grounding practices
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