Matronics Email Lists :: View topic - help for tap off starter cable

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

help for tap off starter cable

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

daniel.m.newman.au(at)gma
Guest

Posted: Wed Feb 21, 2024 5:16 pm Post subject: help for tap off starter cable

Good morning

I'm in Australia, building an RV-8, with rear-mounted batteries.

For the main feed from battery to starter and alternators, I'm using Tycab 35mm^2 flexible power and welding wire, part # ZDU1112102.  On its ends I'm using Cabac  CAL 35-6 tinned coper crimp lugs.

However, I'd like to tap off this cable about half way along it to feed to my electrical/avionics bus.  One way to do it would be to just break the cable, using lugs and a 6mm stud.  I'm thinking about an alternative, stripping off about 20mm of insulation and wrapping with a copper tag, similar to Aero-Electric Connection book Figure 9-5 flag terminal.  The wrap around the wire could be either soldered or crimped.

Has anyone tried anything like this?  Is there any reason why this might be a bad or good idea?

Thank you for your help and advice.

Dan Newman

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

Ceengland

Joined: 11 Oct 2020
Posts: 381
Location: MS

Posted: Wed Feb 21, 2024 5:29 pm Post subject: help for tap off starter cable

On Wed, Feb 21, 2024 at 7:20 PM Dan Newman <daniel.m.newman.au(at)gmail.com (daniel.m.newman.au(at)gmail.com)> wrote:



 	  Quote: 	
		  Good morning

I'm in Australia, building an RV-8, with rear-mounted batteries.

For the main feed from battery to starter and alternators, I'm using Tycab 35mm^2 flexible power and welding wire, part # ZDU1112102.  On its ends I'm using Cabac  CAL 35-6 tinned coper crimp lugs.

However, I'd like to tap off this cable about half way along it to feed to my electrical/avionics bus.  One way to do it would be to just break the cable, using lugs and a 6mm stud.  I'm thinking about an alternative, stripping off about 20mm of insulation and wrapping with a copper tag, similar to Aero-Electric Connection book Figure 9-5 flag terminal.  The wrap around the wire could be either soldered or crimped.

Has anyone tried anything like this?  Is there any reason why this might be a bad or good idea?

Thank you for your help and advice.

Dan Newman

	




Hi Dan, 

I wouldn't do it. Unless you're doing something very unusual in where you're mounting your primary bus, it will logically be between the instrument panel and the firewall; barely 18" of length difference, and actually closer to the electrical bus than a mid-point cut/splice. If you're trying to minimize firewall penetrations, I'd consider mounting the starter contactor on the cold side of the firewall. Then the 'hot' side of the starter contactor is still your distribution point, and only the starter cable penetrates the firewall (other than control/monitoring stuff, of course).

FWIW,

Charlie



Virus-free.www.avast.com[url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2][/url]

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Charlie

ashleysc(at)broadstripe.n
Guest

Posted: Wed Feb 21, 2024 8:43 pm Post subject: help for tap off starter cable

Hi Dan; Where are you going to tie in your ammeter? You want to measure all the current going to and from the battery.

Cheers!   Stu.

From: "Dan Newman" <daniel.m.newman.au(at)gmail.com>

To: aeroelectric-list(at)matronics.com

Sent: Wednesday, February 21, 2024 5:15:18 PM

Subject: help for tap off starter cable

/*<![CDATA[*/pre, code, address { 	margin: 0.0px; } h1, h2, h3, h4, h5, h6 { 	margin-top: 0.2em; 	margin-bottom: 0.2em; } ol, ul { 	margin-top: 0.0em; 	margin-bottom: 0.0em; } blockquote { 	margin-top: 0.0em; 	margin-bottom: 0.0em; } /*]]>*/

Good morning

I'm in Australia, building an RV-8, with rear-mounted batteries.

For the main feed from battery to starter and alternators, I'm using Tycab 35mm^2 flexible power and welding wire, part # ZDU1112102.  On its ends I'm using Cabac  CAL 35-6 tinned coper crimp lugs.

However, I'd like to tap off this cable about half way along it to feed to my electrical/avionics bus.  One way to do it would be to just break the cable, using lugs and a 6mm stud.  I'm thinking about an alternative, stripping off about 20mm of insulation and wrapping with a copper tag, similar to Aero-Electric Connection book Figure 9-5 flag terminal.  The wrap around the wire could be either soldered or crimped.

Has anyone tried anything like this?  Is there any reason why this might be a bad or good idea?

Thank you for your help and advice.

Dan Newman

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

user9253

Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan

Posted: Thu Feb 22, 2024 11:36 am Post subject: Re: help for tap off starter cable

If Charlie's good advice does not fit your situation and you think it better to 

make a splice, then I would NOT make a flag terminal as described in fig 9-5 

because it is designed for connecting to a battery.  The screw and nut are

unnecessary failure points and so is the ring terminal that is clamped to the 

flag.  Perhaps a variation of this method would work for you:

http://www.aeroelectric.com/articles/Tech_Tips/Solder_Lap_Splicing/Solder_Lap_Splices.html

Make the splice as you intended without cutting the large cable, except, instead 

of a flag, wrap the small wire to the large cable with a fine strand and solder.

Protect the splice against vibration.

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Joe Gores

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum