The 110 Volt Ac System; Protective System; Bonding; Zincs - Tayana 37 Operation & Maintenance Manual

2. The 110 Volt AC System

The 110 volt AC electrical system is connected to the shore power system. Its
functions are primarily water heat, battery charge, power outlets, and sometimes
refrigeration and air conditioning. The service capacity is thirty amperes and the
system is protected to that level. Maintenance wise there is little that the
average owner should do. Whenever working on the back of the panel, it is wise
to shut down 110 power. Remember, a yacht is a damp environment, and this
tends to increase the dangers of electric power. The 110 volt system is grounded
in the yacht and this ground should remain. SEE WIRE COLOR TABLE V.-1.

3. Protective System

a. Bonding
b. Zincs
Your yacht is bonded to help prevent galvanic corrosion. All metal parts
of the yacht which might come in contact with salt water are bonded by
green electrical wires in order to provide a low resistance electrical path
for stray currents. Thus, there is a reduced likelihood of current running
through the salt water "electrolyte" and destroying the metal parts. The
bonding system should be checked to make sure that all of the
connections are good and clean.
Sacrificial zincs are bolted onto your rudder and if commissioning is
done by SOUTHERN OFFSHORE YACHTS, a shaft zinc has been
installed. You should check zincs frequently at first to see how fast the
metal is sacrificed. You will then have some idea of how often they must
be replaced. It is not a bad idea to have a separate zinc clipped to a
shroud and hung over the side while at the dock. This will save your
installed zincs and offer some extra protection. To be effective, of
course, it must be clipped to a metal part that is wired into the bonding
system.
It might be well to note here that there are zincs in the cooling system of
your engine. These also must be checked and replaced as they are
sacrificed. Refer to the engine manual for their location.
V-26