General About Marine Dc System - KVH Industries TracPhone F55 Installation Manual

Appendix G: Grounding and RF protection
G.2 General about marine DC system
G.2.1 Wiring systems
There are two basic wiring topologies used for marine DC system grounding:
Two-Wire Return System and One Pole Grounded Return System.
G.2.2 Two-wire Return System
This configuration implies that no part of the circuit, in particular the battery
negative, is connected to any ground potential or equipment. The system is
totally isolated and includes engine sensors, starter motors etc. This
arrangement is preferred for steel and aluminum vessels.
SWITCH
(ON/OFF)
SWITCHBOARD
106
-
+
BATTERY
B+
ALTERNATOR
B-
OUTGOING CIRCUITS

General about marine DC system

STARTER RELAY
(ON/OFF)
+
STARTER
MOTOR
-
-
+
BATTERY
GAUGES
ISOLATOR
ENGINE
SENSORS