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  #11  
Old 03-30-2021, 07:15 PM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
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On the 14 it is really easy to mount a tabs plate on the aft side of the right firewall with a through bolt to the other side where the normal ground bolt and connection is made. The wire runs to that tabs location are easy enough.
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  #12  
Old 03-30-2021, 07:58 PM
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johnbright johnbright is offline
 
Join Date: Aug 2010
Location: Newport News, Va
Posts: 364
Default load on IP ground bus

In my case I followed a combination of Bob Nuckolls and manufacturer's recommendations for grounds and ended up with 16 A max on the subpanel tabs.

Not implemented yet, my schematic shows two 14 awg wires from tabs on the IP tab block to tabs on the firewall aft tab block. Bolts could be used as long as they are two separate bolts for redundancy. If one of the 14 awg connections fails it will be a benign failure detected by physical inspection at next annual. The IP tabs are also bolted/grounded to the subpanel so it's triple redundant.

Items locally grounded: pitot heat, landing lights, interior/map/glareshield lights, nav/strobe mounting brackets, flap motor, seat heaters, 12V outlets and USB chargers, defrost fans, stick switches.

Grounded to the subpanel with its own bolt: nav/strobe ground return (current-carrying) shields.
.
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  #13  
Old 03-31-2021, 12:18 AM
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swisseagle swisseagle is offline
 
Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
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Been there, done that ... until my builder supporter pointed his finger onto.

I measured then the resistance, increased the square size of the wire and made an additional one, so that the resistance was greatly reduced.

Don't remember all the measurements, but he was right. Also, 10 times easier to do now, than later when you may think that there is a problem ;-)
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  #14  
Old 03-31-2021, 03:31 AM
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rv8ch rv8ch is offline
 
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Location: LSGY
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Default # of tabs

Just a suggestion - don't underestimate the number of ground tabs you will need. I recently had to add some, much to my surprise. "The best-laid plans of mice and men ..."
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  #15  
Old 03-31-2021, 08:57 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest
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Default yup

Quote:
Originally Posted by rv8ch View Post
Just a suggestion - don't underestimate the number of ground tabs you will need. I recently had to add some, much to my surprise. "The best-laid plans of mice and men ..."
Truer words were never spoken.
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  #16  
Old 03-31-2021, 01:25 PM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
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Quote:
Originally Posted by rv8ch View Post
Just a suggestion - don't underestimate the number of ground tabs you will need. I recently had to add some, much to my surprise. "The best-laid plans of mice and men ..."
Very true

24 tab mounted on the firewall cold side for all the grounds from boxes between the sub panel and firewall, 20 tabs on the co-pilot side of the sub panel for avionics and 20 more tabs on the pilot side for switch grounds
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Last edited by mfleming : 03-31-2021 at 01:26 PM. Reason: Correction
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