Raymarine RD418HD User Manual page 24

Connecting power
When connecting power, refer to the Planning section and:
• Ensure that the total length of power cable will not exceed the
maximum length, as described under Power cable lengths.
• Connect power only via the correct value thermal breaker or fuse,
as described under Power Supply Protection.
Caution: Do NOT connect to positive
ground system
Do NOT connect this product to a
positively-grounded system.
Connection procedure
Connect the power cable part of the digital cable to either a 12 V or
24 V dc supply, as follows:
1. Red wire to the supply +ve, either at the output of the battery
isolator switch or at a dc distribution panel.
2. Black wire to battery negative.
3. Drain connection (screen) to the common ground point (see
Grounding)
Sharing a breaker
Where more than 1 piece of equipment shares a breaker you must
provide protection for the individual circuits. E.g. by connecting an
in-line fuse for each power circuit.
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HD Digital Radome User's Guide