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LarryRosen
Joined: 16 Jan 2006
Posts: 415
Location: Medford, NJ
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 Posted: Sun May 04, 2008 1:54 pm Post subject: ANL Current Limiter to protect 10 AWG Wire |
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I need some guidance.
I want to use 10 AWG wire from my SD-20 alternator to feed my endurance
bus.
I would like to use an ANL current limiter to protect the wire.
B&C sells a 40 amp ANL and Bussman makes a 35 amp ANL (does anyone have
a source for this 35 amp ANL)
The wire table (Fig 8-3) in the connection suggests 30 amp protection
for 10 AWG wire.
Is 35 or 40 amp protection on this wire acceptable?
Would I be better off using a 14 AWG fusible link?
In addition in this circuit I want to use a S704-1 relay that is rated
at 20 amps, do I need to protect the relay? The maximum loads off the
relay are well below the 20 amps, but if it does see excessive currents,
how does it fail?
Larry Rosen
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_________________
Larry Rosen
#40356
N205EN (reserved)
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rshannon
Joined: 05 Sep 2007
Posts: 62
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| Posted: Sun May 04, 2008 6:28 pm Post subject: ANL Current Limiter to protect 10 AWG Wire |
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Larry,
FWIW, I was convinced by a number of folks that #12 AWG was adequate for both my Jabiru 3300's nominal 20A alternator AND for the SD-20S backup, which have separate charging output circuits, of course. If you look at AC43, you'll see that in short lengths, #12 is plenty big enough for even 30A. I don't expect to ever draw more than 25A from either alternator, and then only for rare, short periods, after a long cold start followed by fairly immediate high RPM, i.e., poor battery mgmt.
On advice of B&C, for over current protection I went with an 30A ATC inline blade fuse, one for each alternator, and the S704-1 relay to provide switching for one leg of the Jabiru PM alternator's output (no field circuit there) for OV protection. I don't think you need a relay for the SD-20, because the OVP scheme (whether inboard with the LR3C regulator, or one of the outboard "crowbar" circuits) will shut down the alternator by cutting the field circuit, wired in series with your panel ALT switch.
Ron
On Sun, May 4, 2008 at 2:50 PM, Larry Rosen <LarryRosen(at)comcast.net (LarryRosen(at)comcast.net)> wrote:
[quote] --> AeroElectric-List message posted by: Larry Rosen <LarryRosen(at)comcast.net (LarryRosen(at)comcast.net)>
I need some guidance.
I want to use 10 AWG wire from my SD-20 alternator to feed my endurance bus.
I would like to use an ANL current limiter to protect the wire.
B&C sells a 40 amp ANL and Bussman makes a 35 amp ANL (does anyone have a source for this 35 amp ANL)
The wire table (Fig 8-3) in the connection suggests 30 amp protection for 10 AWG wire.
Is 35 or 40 amp protection on this wire acceptable?
Would I be better off using a 14 AWG fusible link?
In addition in this circuit I want to use a S704-1 relay that is rated at 20 amps, do I need to protect the relay? The maximum loads off the relay are well below the 20 amps, but if it does see excessive currents, how does it fail?
Larry Rosen
[b]
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rshannon
Joined: 05 Sep 2007
Posts: 62
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| Posted: Sun May 04, 2008 6:32 pm Post subject: ANL Current Limiter to protect 10 AWG Wire |
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Forgot to mention that Potter & Brumfield, makers of the S704-1, rate it for 30A through the N.O. contact when used in SPST configuration. If I'm paying attention, it should hardly ever see more than 20A, and never more than 30A from the Jabiru's PM alternator.
Ron
[quote][b]
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