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.
D11637-2
2
4
4
1
3
+
-
1
Positive (+) bar
2
Negative (-) bar
3
Circuit breaker
4
Fuse
Where possible, connect individual items of equipment to
individual circuit breakers. Where this is not possible, use
individual in-line fuses to provide the necessary protection.
Warning: Product grounding
Before applying power to this product, ensure it has
been correctly grounded, in accordance with the
instructions in this guide.
Grounding information (PoE injector only)
The information provided in the following section applies only to
the PoE injector.
Grounding — Dedicated drain wire required
This product includes a dedicated drain conductor (screen) for
connection to a vessel's RF ground point.
It is important that an effective RF ground is connected to
the unit. The unit can be grounded by connecting the drain
conductor (screen) to the vessel's RF ground point. On vessels
without an RF ground system the drain conductor (screen)
should be connected directly to the negative battery terminal.
The dc power system should be either:
• Negative grounded, with the negative battery terminal
connected to the vessel's ground; or
• Floating, with neither battery terminal connected to the
vessel's ground.
If several items require grounding, they may first be connected
to a single local point (e.g. within a switch panel), with this point
connected via a single, appropriately-rated conductor, to the
vessel’s common RF ground point.
Implementation
The preferred minimum requirement for the path to ground is via
a flat tinned copper braid, with a 30 A rating (1/4 inch) or greater.
If this is not possible, an equivalent stranded wire conductor
maybe used, rated as follows:
• for runs of <1 m (3 ft), use 6 mm
2
(#10 AWG) or greater.
• for runs of >1 m (3 ft), use 8 mm
2
(#8 AWG) or greater.
In any grounding system, always keep the length of connecting
braid or wires as short as possible.
References
• ISO10133/13297
• BMEA code of practice
• NMEA 0400
Warning: Positive ground systems
Do not connect this unit to a system which has
positive grounding.
T200
