LT–IXFMR36–1
8
Charles Industries, Ltd. All rights reserved. Printed in the United States of America.
Wired as a Polarization Transformer
In this method the shield and the shore grounding conductor are wired directly to the transformer neutral (X2) and
case ground (GND). An optional galvanic isolator is also shown in-line with the shoreline grounding wire.
Note:
This diagram does not illustrate a complete system. Refer to the appropriate ABYC text.
Single-Phase 120-Volt Polarization Transformer System with Grounded Secondary, and Grounding (green)
Conductor.
The ungrounded and grounded shore current-carrying conductors are connected from the power inlet to the
primary winding of the polarization transformer through an overcurrent protection device which simultaneously
opens both current-carrying shore conductors. Fuses shall not be used in lieu of the simultaneous trip devices.
120-Volt branch circuit breakers are permitted to use single-pole breakers in the ungrounded current-carrying
conductors.
The shore grounding (green) conductor is connected from the shore power cable and the boat’s power inlet
directly to all noncurrent-carrying parts of the AC electrical system including the transformer case and shield
and to the engine terminal or its bus without interposing switches or overcurrent protection devices.
One current-carrying condcutor of the transformer secondary is grounded on the boat and is designated as
neutral.
ÉÉÉ
ÉÉÉ
ÉÉÉ
ÉÉÉ
ÉÉÉ
ÉÉÉ
ÉÉÉ
Ungrounded Conductor (Black)
Grounded Neutral Conductor (White)
Grounding Conductor (Green)
Shore Connection
Shore Power Cable
Shore Power Cable Connector
2-Pole, 3-Wire Grounding
Type Plugs & Receptacles
Shore Side
Boat Side
Power Inlet
(Electrically insulated
from the Boat if an
Main Shore Power
Disconnect
Circuit Breaker
Encapsulated Single Phase
Polarization Transformer with
To Engine Negative
Terminal or its Bus
Black
White (Neutral)
Green
120 VAC
Grounding
Type
Receptacle
120 VAC
Device
Branch
Circuit
Breaker
(Typical)
Transformer Case
Ground Connection
Isolator is Installed)
Optional
Galvanic
Isolator
Metal Case
Charles Marine Products Note: Shield to be connected to case ground on IsoTransformer
Figure 3. Electrical Diagram – Method 3 (see Figure 7 for Wiring Connections)
