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The application is the E-buss direct switch. I have placed seldom used items like the landing/taxi light, flaps, trim, and fuel pump on the E-buss. With everything on (and transmitting) the current can be in the mid 20's. I would rather not use another contactor. So, I was hoping to just use a switch.
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...I think it would be reasonable to assume that everything is NOT transmitting when the switch is activated.
Would you really flick this E-bus switch and hold down the PTT at the same time?
Since a comm radio is probably over 5 amps in Tx mode, does this change your calculations and let you use a more reasonably rated switch?
Gil,
snipped
Charlie,
The assumption in Bob's book is that the switch will be "switching" the entire load. As stated above, I will not be doing that. Thus, my question to the group.
Past threads on endurance vs emergency busses have debated the merits/demerits of each. After I read both sides of the debate, I decided that I will place seldom used items on my E-buss so that IF I arrive at my destination (or suitable landing site) with battery power still available, I can lower flaps, turn on the fuel pump, perhaps even turn on lighting if I want. If I am low on battery power, I won't. But, I have the option. And, yes, if it is in fact just an alternator failure, you can turn the master back on and still have access to main buss items. However, if the problem is a main buss fault of some sort, you have to troubleshoot the problem before re-engaging the master. I would prefer not to have to troubleshoot in the air, if possible.
PS Please check your private messages
Why do you have the lights, flaps, and fuel pump on the E-buss? If you follow Bob N's philosophy, those items would remain on the main bus, which can be re-activated if you need them. The E-bus is for the items needed for safe continued operation under battery only conditions - with minimal load.----
The application is the E-buss direct switch. I have placed seldom used items like the landing/taxi light, flaps, trim, and fuel pump on the E-buss. With everything on (and transmitting) the current can be in the mid 20's. I would rather not use another contactor. So, I was hoping to just use a switch.
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Thanks again,