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klehman(at)albedo.net
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 Posted: Tue Oct 15, 2013 8:13 am Post subject: New electrical architecture with ENGINE BUS |
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It is good to have two ground straps on an electric dependant engine.
There are a few cases of failed single ground straps causing sudden
quiet. I noticed one of mine was not as tight as it should have been on
an annual inspection.
Ken
On 15/10/2013 11:33 AM, user9253 wrote:
| Quote: |
<fransew(at)gmail.com>
> ...in my fiberglass airframe, can I bring a SINGLE 4AWG ground
> directly to the engine?
The size of the wire depends on the starter current and also the
distance between the battery and the starter. The negative wire is
just as important as the positive wire. If you use a singe wire, be
100 percent sure that the connections at each end will not loosen or
corrode. The same can be said for the positive wire (if only one is
used).
> can I (should I?) use a brass strap to connect the (-) sides of the
> contactors?
Contactors do not have a negative side unless you are talking about
the coil. If you use 2 battery contactors, then the negative side of
each coil is connected to a separate switch. A brass strap could be
used to connect the negative terminals of 2 batteries together. Joe
-------- Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=410614#410614
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Bob McC
Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON
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| Posted: Tue Oct 15, 2013 9:33 am Post subject: New electrical architecture with ENGINE BUS |
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A brass strap should NOT be used to connect the two battery negative terminals together. The only thing connected to any battery terminal should be soft flexible welding cable to reduce the risk of vibration failure of the terminals themselves. A rigid brass strap will transmit vibration from one battery to the other with the possibility of breaking off the terminal on one or the other.
Bob McC
| Quote: | Subject: Re: New electrical architecture with ENGINE BUS
From: fransew(at)gmail.com
Date: Tue, 15 Oct 2013 08:33:45 -0700
To: aeroelectric-list(at)matronics.com
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>
> ...in my fiberglass airframe, can I bring a SINGLE 4AWG ground directly to the engine?
The size of the wire depends on the starter current and also the distance between the battery and the starter. The negative wire is just as important as the positive wire. If you use a singe wire, be 100 percent sure that the connections at each end will not loosen or corrode. The same can be said for the positive wire (if only one is used).
> can I (should I?) use a brass strap to connect the (-) sides of the contactors?
Contactors do not have a negative side unless you are talking about the coil. If you use 2 battery contactors, then the negative side of each coil is connected to a separate switch. A brass strap could be used to connect the negative terminals of 2 batteries together.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=410614#410614
>====
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http://www.matronics.com/Navigator?AeroElectric-List |
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_________________
Bob McC
Falco #908
(just starting) |
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