Raymarine VCM100, Installation Instructions Manual

Page: 27 / 58

3.9 VCM100 power cable extension
The power cable can be extended for longer cable runs between
the VCM100 and your vessel’s DC distribution panel or battery
isolator switch.
If you need to extend the power cable, use a splash proof junction
box. The junction box should provide a terminal strip with sufficient
space for power connections. The terminal strip should be a
minimum of 30 Amp rating for power cores. It is essential that both
power cores and the screen (drain) are connected and that the
connection is of very low resistance as considerable power passes
through this connection.
The following table provides recommended total power cable lengths
and gauges. These figures relate to the maximum distance of power
cables from the battery isolator switch or DC distribution panel to the
VCM100. Exceeding these lengths may cause unreliable operation.
AWG
(American
Wire Gauge)
mm 2
Maximum
distance (12
volt supply) Maximum
distance (24
volt supply)
7 10.55 15 m (49.2 ft.) 55 m (180.4 ft.)
8 8.36 10 m (32.8 ft.) 40 m (131.2 ft)
10 5.26 8 m (26.2 ft.) 32 m (104.9 ft.)
11 4.17 6 m (19.6 ft.) 24 m (78.7 ft.)
Note: If the required extensions result in unacceptably large
diameter cables, use two or more smaller gauge wires to achieve
the required copper wire cross-section. For example, using two
pairs of 2 mm
2 cables is equivalent to using two single 4 mm 2
cables.
3.10 VCM100 screen (drain) wire
extension
The screen (drain) wire can be extended for longer cable runs
between the VCM100 and your vessel’s RF ground system.
Extensions to the screen (drain) wire should use an 8 mm braid or
AWG 10 (5.26 mm
2 ) multi-stranded cable.
Cables and connections 27