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102808_CAPAC_MANUAL_MODEL_90W12D_SYSTEM.doc
Section II
Application
The 90W12D system is designed to deliver an automatically controlled
anode current of up to 7.5 amperes to the anode(s) from a 12-volt DC source
with the negative terminal grounded to the hull or fittings.
NOTE: UNDER NO CONDITION SHOULD CAPAC
®
BE OPERATED FROM OTHER THAN A
NEGATIVELY GROUNDED SOURCE.
It is primarily intended for installation on wood or fiberglass hulls of up to
100 feet; however, it will also protect well-painted metal hulls of up to 65 feet.
These hull lengths are merely a practical guide, since the capability of the system
to protect any metal is determined by the area of the bare metal surface under
water.
Each metal requires a different amount of current for protection or
“polarization”. Table 2.1 below gives the number of square feet of each metal,
which the system will protect. The table below is not meant to imply that the
CAPAC
®
system can be used on a non-painted hull but is given to illustrate the
protection current requirements of different metals.
TABLE 2.1
METAL NUMBER OF SQUARE
FEET
CURRENT DENSITY AMPERES PER SQUARE
FEET
Bare Bronze 185 0.04
Bare Steel 750 0.01
Bare Aluminum 500 0.015
Bare Stainless
Steel
250 0.03
When the metal surfaces are painted, the current requirement may be
reduced by as much as a factor of 10. Therefore, the system would protect as
much as 7500 square feet of newly painted steel.
On a newly painted hull protection current requirements will be minimal
and as the hull coating deteriorates or is damaged, current requirements will
increase.
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