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54
Chapter 4
ISOLATION TRANSFORMER
OVERVIEW
To this point we have covered the process of bringing
AC electricity from the marina dock power center to the
yacht through the standard shore power inlet including
the optional cord reel.
THEORY
Many yachts use an op-
tional system to distribute
AC electricity that includes
a double pole single throw
inlet breaker, isolation
transformer, triple pole sin-
gle throw breaker after the
transformer coupled with
the ship’s AC main control
panel and auxiliary equipment breakers. This is accom-
plished through an isolation transformer. The cord reel
is an option that usually ends up as part of this system.
The isolation transformer component is a 50 amp isola-
tion and boosting transformer installed within the engine
room after the shore power inlet. This unit eliminates
the need for a standard galvanic isolator. Another fea-
ture of the transformer is it has voltage boosting capabili-
ties, when shore power voltages are compromised due to
length of run, amongest other factors.
As installed on an isolation transformer con
fi gured boat,
the entrance breaker is a two pole breaker. This 2 pole
breaker will provide circuit protection to Line 1 and Line
2 conductors only, as there will be no neutral conductor
coming aboard the boat through the shore power inlet
or automatic cord reel.
The shore cord male plug is
actually without the neutral pin. With the cord reel the
shore inlet wires will land on the Line side of the entrance
breaker, and the wires to the isolation transformer will
land on the Load side of the entrance breaker.
Current then travels to the input side of the isolation
transformer.
ISOLATION TRANSFORMER WIRING
3 POLE BREAKER
2 POLE INLET BKR.