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Firewall Placement Of Electrical Components

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nuckolls.bob(at)cox.net
Guest

Posted: Fri Dec 21, 2007 3:54 pm Post subject: Firewall Placement Of Electrical Components

At 08:39 AM 12/20/2007 -0800, you wrote:



 	  Quote: 	
		  

<david.m.gallagher(at)ge.com>



I am building a Zenith 601 and using a variation of the Z16 drawing.  I am 

currently working on placing my regulator, S704-1 OV relay and 

capacitor.  The B&C instructions are pretty clear that this stuff should 

be mounted on the cockpit side of the firewall and away from engine 

heat.  In this configuration, the Z16 would have me running a 12GA from 

the capacitor, through the firewall, and out to the up-leg screw on the 

starter relay.  I would also have a 12GA going from the down-leg screw of 

the battery relay, through the firewall, and to the main distribution 

bus.  My question is two-fold:



1. Is it critical that these electrical parts be on the backside of the 

firewall.  I have seen photos of this stuff on the engine side on other 

airplanes.


	


  Everyone likes to "stay cool" but virtually every

  product I design these days is required to live

  and work in a 55C environment minimum and virtually

  all our stuff can be demonstrated to run up to 100C.



  Lots of folks have installed the B&C products and

  the products of others on the engine side of the

  firewall with no complaints. Your risks are low.

 	  Quote: 	
		  2. If I follow B&C's recommendation on placement,  can I run the 

alternator lead from the capacitor straight to the main distribution 

bus?  This would only require one 12GA wire firewall penetration from the 

bus to the battery relay.


	


  If it's a cleaner installation to go up front, go ahead

  and do it.



  Bob . . .

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Sat Dec 22, 2007 4:00 pm Post subject: Re: Firewall Placement Of Electrical Components

Bob,



Thanks for the answer.  Sometimes I just need a little positive reinforcement to keep me moving forward.



Happy holidays to all,

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_________________
David Gallagher
Cincinnati, OH area

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