Appendix C: Wiring and Electrical Connections
SkyView HDX System Installation Manual - Revision E 25-1
25 Appendix C: Wiring and Electrical Connections
SkyView utilizes standardized network connectors and wire harnesses for
equipment-to-equipment connections as well as other connections. Installers
should rarely have to build custom wire harnesses. This appendix is included
as a reference for those rare times when custom wiring is required.
Improper wiring can result in permanent damage to your instrument and/or
the accompanying sensors.
Make all connections to your harness before plugging it into any of the
components of the system. Do not make connections while power is applied
at any point in the system.
25.1 Wire Gauge
Unless otherwise specified, 22 AWG wire is normally sufficient for the power supply and
ground lines, but we recommend that you consult a wire sizing chart to determine the size
required for the wire routing in your particular aircraft. Ensure that the power lines include
a circuit breaker or an appropriately sized fuse for the wire you select.
Smaller gauge wire is sufficient for lines that only carry data.
FAA Advisory Circular AC 43.13-1B is an excellent resource for wire sizing requirements
as well as other acceptable methods, techniques, and practices in aircraft inspection and
repair.
25.2 Grounding
Many of the engine sensors require a connection to a ground on the SV-EMS-220. There
are many places on an aircraft where you could connect these sensors. However, the
ideal location to ground these sensors is to one (1) of the SV-EMS-220 ground pins.
Connecting the sensor’s ground pin directly to the SV-EMS-220 minimizes any voltage
difference between sensor ground and SV-EMS-220 ground.
You can measure the voltage difference between grounds to check if the
connection has a minimal voltage drop. Set a multimeter to the DC voltages
setting and place one (1) sensor tip on one (1) ground and place the other
sensor tip on the other. Measurements close to 0 mV (within 5 mV) are, in
most cases, acceptable.
Other grounding recommendations include:
• Ensure that solid, thick electrical connections exist between engine and battery
ground.
• Do not paint over surfaces that are ground connection points.
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