Today's Message Index:
----------------------
1. 08:00 AM - Re: wiring my amerri-king A-350 to my Narco AT-50A (Robert L. Nuckolls, III)
2. 08:40 AM - amerri-king A-350/Narco AT-50A (correction) (Robert L. Nuckolls, III)
3. 07:42 PM - Newbie Wiring Questions (Art Zemon)
4. 09:18 PM - Re: Newbie Wiring Questions (Charlie England)
5. 09:42 PM - Re: Newbie Wiring Questions (Ken Ryan)
6. 10:23 PM - Re: Newbie Wiring Questions (Rob Turk)
Message 1
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| Subject: | Re: wiring my amerri-king A-350 to my Narco AT-50A |
At 09:04 PM 2/29/2016, you wrote:
>Thanks.
>The bare wire of the encoder seems no to fit anywhere, but it's
>usually ground wire. What's the difference with the Black one wich
>is also a ground wire ?
The black, insulated wire is USUALLY a power/signal
ground having significance with the operations of
the device. A bare wire has to be a shield ground
for the harness. Do an ohmmeter check to see if
the bare wire has continuity at the encoder end.
If so, then leave it unconnected at the transponder
end. OTHERWISE, connect it to the same ground
as the black insulated wire at the transponder
end.
Bob . . .
Message 2
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| Subject: | amerri-king A-350/Narco AT-50A (correction) |
At 09:04 PM 2/29/2016, you wrote:
>Thanks.
>The bare wire of the encoder seems no to fit anywhere, but it's
>usually ground wire. What's the difference with the Black one wich
>is also a ground wire ?
The black, insulated wire is USUALLY a power/signal
ground having significance with the operations of
the device. A bare wire has to be a shield ground
for the harness. Do an ohmmeter check to see if
the bare wire has continuity (TO THE CASE OF
THE ENCODER) at the encoder end.
If so, then leave it unconnected at the transponder
end. OTHERWISE, connect it to the same ground
as the black insulated wire at the transponder
end.
Bob . . .
Bob . . .
Message 3
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| Subject: | Newbie Wiring Questions |
Hello,
I am starting to plan the wiring for my BD-4C. My immediate problem is that
I want to install the wires for things which will go in the rear of the
plane, and near the floor by the back seat, soon so that I can close up the
"tunnel" and (hopefully) not need to get in there again.
The autopilot servos and the magnetometer have me wondering what to do.
Each needs power + 4 signal wires. The autopilot servos draw up to 1.7 A so
I think I use larger wire for the power than the signals. The magnetomer
only draws 0.12 A, though, so do I just get a cable with 5 or 6 conductors
in it? Or should the power be a separate wire from a 4-conductor signal
cable?
The rear seat intercomm has me wondering, too. It looks like 4-conductors
will do, since there aren't any PTT switches. But shielded or not? I think
not but would like some reassurance.
Finally, an off the wall question: How do you size a fuse for a circuit? Do
you just round up to the next highest integer or do you go bigger? I'm
thinking of the autopilot servos, average current of 0.9 A and max current
of 1.71 A. Should I use a 2 A fuse? 3 A? Put both on a single 5 A fuse?
Something else?
Thanks,
-- Art Z.
--
http://CheerfulCurmudgeon.com/ <http://cheerfulcurmudgeon.com/>
*"If I am not for myself, who is for me? And if I am only for myself, what
am I? And if not now, when?" Hillel*
Message 4
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| Subject: | Newbie Wiring Questions |
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Message 5
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| Subject: | Re: Newbie Wiring Questions |
Example: 1.7 amp X 2 = 3.4 amps. Table 11-9 in AC43.13 shows to carry that
amount of current you will need at least #20 wire. Figure 11-2 shows #20
wire with 4 amps can only be 12 feet long (otherwise too much voltage
drop). I would use #18 to be safe. Table 11-3 shows #18 wire being
protected by 10 amp breaker or 10 amp fuse. That would be the maximum.
Since the load is only 3.4 amps I would use a 5 amp fuse. Or something like
that. Consult 43.13 for specifics.
On Wed, Mar 2, 2016 at 8:16 PM, Charlie England <ceengland7@gmail.com>
wrote:
> Size the wire for the load. Size the fuse to protect the wire.
>
>
> -------- Original message --------
> From: Art Zemon
> Date:03/02/2016 9:39 PM (GMT-06:00)
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Newbie Wiring Questions
>
> Hello,
>
> I am starting to plan the wiring for my BD-4C. My immediate problem is
> that I want to install the wires for things which will go in the rear of
> the plane, and near the floor by the back seat, soon so that I can close up
> the "tunnel" and (hopefully) not need to get in there again.
>
> The autopilot servos and the magnetometer have me wondering what to do.
> Each needs power + 4 signal wires. The autopilot servos draw up to 1.7 A so
> I think I use larger wire for the power than the signals. The magnetomer
> only draws 0.12 A, though, so do I just get a cable with 5 or 6 conductors
> in it? Or should the power be a separate wire from a 4-conductor signal
> cable?
>
> The rear seat intercomm has me wondering, too. It looks like 4-conductors
> will do, since there aren't any PTT switches. But shielded or not? I think
> not but would like some reassurance.
>
> Finally, an off the wall question: How do you size a fuse for a circuit?
> Do you just round up to the next highest integer or do you go bigger? I'm
> thinking of the autopilot servos, average current of 0.9 A and max current
> of 1.71 A. Should I use a 2 A fuse? 3 A? Put both on a single 5 A fuse?
> Something else?
>
> Thanks,
> -- Art Z.
>
> --
> http://CheerfulCurmudgeon.com/ <http://cheerfulcurmudgeon.com/>
>
> *"If I am not for myself, who is for me? And if I am only for myself, what
> am I? And if not now, when?" Hillel*
>
Message 6
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| Subject: | Re: Newbie Wiring Questions |
Good example, but you didn't apply the "size the fuse to protect the
wire" rule. Using a 5A fuse is sized to the load, not to the wire. The
table says 10A for a #18 wire, so use 10A.
On 3/3/2016 6:40 AM, Ken Ryan wrote:
> Example: 1.7 amp X 2 = 3.4 amps. Table 11-9 in AC43.13 shows to carry
> that amount of current you will need at least #20 wire. Figure 11-2
> shows #20 wire with 4 amps can only be 12 feet long (otherwise too
> much voltage drop). I would use #18 to be safe. Table 11-3 shows #18
> wire being protected by 10 amp breaker or 10 amp fuse. That would be
> the maximum. Since the load is only 3.4 amps I would use a 5 amp fuse.
> Or something like that. Consult 43.13 for specifics.
>
> On Wed, Mar 2, 2016 at 8:16 PM, Charlie England <ceengland7@gmail.com
> <mailto:ceengland7@gmail.com>> wrote:
>
> Size the wire for the load. Size the fuse to protect the wire.
>
>
> -------- Original message --------
> From: Art Zemon
> Date:03/02/2016 9:39 PM (GMT-06:00)
> To: aeroelectric-list@matronics.com
> <mailto:aeroelectric-list@matronics.com>
> Subject: AeroElectric-List: Newbie Wiring Questions
>
> Hello,
>
> I am starting to plan the wiring for my BD-4C. My immediate
> problem is that I want to install the wires for things which will
> go in the rear of the plane, and near the floor by the back seat,
> soon so that I can close up the "tunnel" and (hopefully) not need
> to get in there again.
>
> The autopilot servos and the magnetometer have me wondering what
> to do. Each needs power + 4 signal wires. The autopilot servos
> draw up to 1.7 A so I think I use larger wire for the power than
> the signals. The magnetomer only draws 0.12 A, though, so do I
> just get a cable with 5 or 6 conductors in it? Or should the power
> be a separate wire from a 4-conductor signal cable?
>
> The rear seat intercomm has me wondering, too. It looks like
> 4-conductors will do, since there aren't any PTT switches. But
> shielded or not? I think not but would like some reassurance.
>
> Finally, an off the wall question: How do you size a fuse for a
> circuit? Do you just round up to the next highest integer or do
> you go bigger? I'm thinking of the autopilot servos, average
> current of 0.9 A and max current of 1.71 A. Should I use a 2 A
> fuse? 3 A? Put both on a single 5 A fuse? Something else?
>
> Thanks,
> -- Art Z.
>
> --
> http://CheerfulCurmudgeon.com/ <http://cheerfulcurmudgeon.com/>
>
> /"If I am not for myself, who is for me? And if I am only for
> myself, what am I? And if not now, when?" Hillel/
>
>
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