billhuntersemail(at)gmail
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 Posted: Fri May 19, 2017 6:51 pm Post subject: Grounding On A Composite Airplane |
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Greetings,
I have a question about the grounding cables of this in construction design.
I have two independent electrical systems each with a heavy gauge cable that connects the respective NEG pole of the battery to the engine block/starter motor case and the questions are:
Do I need a ground cable to connect the two NEG sides together or is the big cables that connect the respective batteries to the engine block/starter sufficient?
If you do recommend a ground interconnect what size cable should I have considering that one battery is mounted under the rear seat and the other is mounted in the nose?
-------------------------ADDITIONAL INFORMATION------------------------------------
The airplane is a Velocity (composite pusher) with a TIO-540 engine (7.3 compression) and a 12 VDC dual battery/dual independent electrical systems.
The “RED” system is an independent system that is powered by an SD-20 and a BNC BC116-1 battery mounted under the rear seat The POS cable is AWG 2 and runs from battery + to the battery contactor mounted under the rear seat. The other pole of the contactor is mounted to a copper bus bar that is the BUS TIE. The NEG cable is AWG 2 and runs directly from the battery (–) pole to a stud on the starter motor. There is a AWG 8 cable that connects the engine block to a rear firewall bus bar (copper bar). The alternator cable and the bus feed are 8 AWG wire. The RED system just powers the following:
-Pilot side EFIS
-Plasma III ignition system
-Taxi light.
The “GREEN” system is an independent system that is powered by a L60 and a BNC BC116-1 battery mounted in the nose. The POS cable is AWG 2 and runs from battery + to the battery contactor mounted in the nose and then another AWG 2 cable connects the battery contactor to the BUS TIE mounted on a copper bus bar mounted under the rear seat. The NEG cable is AWG 2 and runs from the battery (–) pole directly to the stud on the engine block. There is a AWG 8 cable that connects the battery (-) pole to the nose/avionics firewall bus bar (copper bar). The GREEN system powers the following:
-Copilot EFIS
-Plasma III ignition system
-All other electrical loads
The BUS TIE contactor is mounted under the rear seat and one pole is the GEEEN system power feed cable and the other pole is connected to the copper bus bar that the connects the RED system battery contactor and the starter contactor. The starter contactor has a 2 AWG cable that connects the starter contactor to the starter motor.
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THANKS!!!
Bill Hunter
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