Furuno FM-8800D Installation Manual page 24

2. CONNECTIONS
Protective earth
Connect IV-2.0sq wire between ship's superstructure and the ground terminal on the
PR-240.
2-6
CAUTION
Attach protective earth
securely to the ship's body.
The protective earth
(grounding) is required for the
AC/DC power supply unit to
prevent electrical shock.
Attach a label here.
PR-240 Front panel
GND terminal