About Marine Dc Systems - Furuno Inmarsat FleetBroadband FELCOM251 Installation Manual

4. GROUNDING AND RF PROTECTION
4.2

About Marine DC Systems

4.2.1 Wiring systems
Two basic wiring topologies are used for marine DC system grounding:
Two-Wire Return System and One Pole Grounded Return System.
4.2.2 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 aluminium vessels.
SWITCH
(ON/OFF)
SWITCHBOARD
4-2
-
+
BATTERY
STARTER RELAY
(ON/OFF)
B+
ALTERNATOR
B-
OUTGOING CIRCUITS
-
+
BATTERY
+
GAUGES
STARTER
MOTOR
-
ENGINE
SENSORS
ISOLATOR