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Relays.

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jack.byrne(at)bigpond.com
Guest

Posted: Sat Oct 21, 2006 8:19 pm Post subject: Relays.

Am wiring probe heat and taxi/ldg lights.

Should I be using a relay or will straight through the switch suffice?

Both draw 8 Amps.

Using 700 1-3 switches from B & C.



Thanks

Chris Byrne

SYDNEY

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FLYaDIVE(at)aol.com
Guest

Posted: Sun Oct 22, 2006 3:15 am Post subject: Relays.

In a message dated 10/22/2006 12:22:19 AM Eastern Standard Time, jack.byrne(at)bigpond.com writes:

  	  Quote: 	
		  

Am wiring probe heat and taxi/ldg lights.

Should I be using a relay or will straight through the switch suffice?

Both draw 8 Amps.

Using 700 1-3 switches from B & C.



Thanks

Chris Byrne

SYDNEY 	


 =================================

 Chris:

  

 I strongly believe in the K.I.S.S. M.E. Principal and fewer components with less failure points sure supports that principal.

 I would use a Toggle Switch Circuit Breaker (CB), install wire of sufficient design (Mil-W) to handle your power requirements Now and in the Future and use a good crimp lug & tool.

  

 Doing it this way you eliminate the separate CB and the associated screws & lugs ... And work.  And you have a high quality switch as part of the CB, one wire run, maybe two if you do not trust the plane to be the ground side ... I don't!

  

  

 Barry

"Chop'd Liver"



"Show them the first time, correct them the second time, kick them the third 

time." 

Yamashiada

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nuckollsr(at)cox.net
Guest

Posted: Sun Oct 22, 2006 5:55 am Post subject: Relays.

At 02:16 PM 10/22/2006 +1000, you wrote:



 	  Quote: 	
		  

<jack.byrne(at)bigpond.com>



Am wiring probe heat and taxi/ldg lights.

Should I be using a relay or will straight through the switch suffice?

Both draw 8 Amps.


	


 	  Quote: 	
		  Using 700 1-3 switches from B & C.


	


    Have you reviewed any of the architecture drawings

    in



http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf



    You will note that relays and contactors are relatively

    scarce in the drawings. Their use is indicated where

    you need to (1) control currents that are too large for

    the panel mounted switch, (2) the point where switching

    needs to take place is remotely mounted from pilot's

    reach on the panel or (3) you need synchronized, multi-

    circuit switching to satisfy a design goal that might be

    met with something like a 4-pole, double throw relay.



    The S700 series switches are suited to the tasks

    you've cited. For the vast majority of airplanes

    flying, the use of relays is on a par with applications

    shown in the Z-figures. On occasion, you may encounter

    a system installation that calls for relays . . . an

    example is illustrated here:



http://www.aeroelectric.com/Pictures/Relays/TooManyRelays.jpg



    It's doubtful that whoever designed this system had

    "simplicity" in mind. Flight system reliability for

    so complex an array o relays leaves much to be desired.



    Bob . . .



      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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