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jcohen@post.com
Joined: 10 Mar 2022
Posts: 17
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 Posted: Thu Feb 09, 2023 4:05 pm Post subject: FAT Wire Pt Implementation Question |
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I was planning on using one terminal stud of my 40A MIDI base (sold by B&C) to also act as my FAT wire point in Z101. But the B&C MIDI base utilizes #10 (0.1875" diam.) terminal studs, I was expecting 0.31" studs. I have three ring terminals that meet at this one #10 stud, of which one is 4AWG wire coming from the hot side of the battery contactor.
Is using this smaller #10 stud for my main power feed FAT wire point a poor choice? I ask because most #4 wire connects to 0.31" studs in my experience, though I am a novice at this. Can the smaller #10 stud handle continuous larger currents at 12V like the 0.31" stud can?
My system is Z101 on an RV7 IO360 with EFII. My power analysis shows nominal total aircraft continuous power draw in CRUISE of about 40amps, TO/LDG configuration can expect approx. 60amps total.
Should I change to device with a 0.31" stud for my hot wire point, to prevent either overheating hazards or unnecessary resistance/loss in the wire path? What do people commonly use for FAT wire points? I don't see many single junction posts available in aviation catalogs, lots on Amazon but questionable quality. Your comments / help is much appreciated.
Jeff
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johnbright
Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA
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| Posted: Thu Feb 09, 2023 5:57 pm Post subject: Re: FAT Wire Pt Implementation Question |
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You could crimp multiple wires into a larger terminal. If loose in terminal, fill with extra strands. BTW this method is Nuckolls approved and removes one FMEA failure mode - if nut loose on stud those wires are still connected together.
This may allow you to use a contactor stud instead of a separate fat wire tie point.
Hope my spreadsheet is not too cryptic. https://docs.google.com/spreadsheets/d/1RhErTJKOWOL39Aw6lWJwQCgBQZzuCNf9GmS4MCgzcnc/edit
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John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
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jcohen@post.com
Joined: 10 Mar 2022
Posts: 17
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| Posted: Fri Feb 10, 2023 9:45 am Post subject: Re: FAT Wire Pt Implementation Question |
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John, Your spreadsheet "terminals to use with multiple wires" is very helpful. I really appreciate that information and will follow your suggestion to reduce the number of connections with nuts when possible.
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