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jnmeade
Joined: 27 Sep 2012
Posts: 12
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 Posted: Mon Mar 08, 2021 5:14 pm Post subject: Rotax 912ULS External Alt Sense Wire |
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I plan to run a sense wire from the IG terminal of the Denso 201080-0800 40A alternator to the load side of the 25A CB that is used for a master switch on the Flight Design CTSW. The sense wire will be about 5' long.
1. I'm thinking of using an 18AWG wire for the sense wire. I don't want any voltage loss on this sense circuit.
2. Is there any particular need to insert a fuse? It would call for a 10A fuse. If I need one, I'd probably use an inline automobile fuse but I haven't decided to add a fuse or not. Your thought?
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user9253
Joined: 28 Mar 2008
Posts: 1922
Location: Riley TWP Michigan
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| Posted: Mon Mar 08, 2021 8:09 pm Post subject: Re: Rotax 912ULS External Alt Sense Wire |
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The only way to lose voltage is for current to flow. A sense wire that carries very
little current will have very little voltage drop. A 25 amp circuit breaker is too big
to protect a small gauge wire. So protect the sense wire with a fuse. Wires subject
to engine vibration are more likely to short out than in other places in an airplane.
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