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Toggle switch keyways redux

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Mar 18, 2011 10:44 am Post subject: Toggle switch keyways redux

>At 10:54 AM 3/1/2011, I wrote:

 >I would take "keyway conventions" with a grain of salt!

 >

<snip>



 >   When we began to study the application of progressive

 >   transfer switches I published drawings with numbered

 >   terminals to assist the neophyte technician in getting

 >   wires on the right  terminals the first time. I discovered

 >   that the way Microswitch and Carling built their progressive

 >   switches was not the same. I had to publish this piece to

 >   make folks aware of the differences:

 >

 >http://www.aeroelectric.com/articles/Carling_Micro/Carling_Micro.pdf

 >

 >   . . . right and left hand columns were functionally

 >   swapped between the two brands. In later years,

 >   I think Carling swapped their progressive transfer

 >   switches to conform to what the mil-spec guys

 >   were doing.



 >   Microswitch had numbers molded into their switch

 >   housings as did the other high-end suppliers. So

 >   I adopted THEIR convention for speaking to terminal

 >   numbering versus functionality.

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



    I was wiring up a Microswitch product yesterday and

    noted (1) terminal numbers were indeed molded into the

    switch housing and (2) my illustration cited above was

    technically correct. But I see that while looking into the

    back of the switch, the numbers are right-side-up for

    reading when the key-way was down.



    Years later, I have no recollection of why I chose

    to reference the illustration key-way up . . . flip

    of the coin I guess. In any case, a degree of confusion

    would no doubt have been avoided had I translated more

    accurately from the data presented in the manufacturer's

    catalog data.



    For newer members to the List, I'll mention that

    the 'Connection website has an archive of manufacturer's

    data publications at:



http://aeroelectric.com/Mfgr_Data.html



    If anyone discovers data on a useful product that

    could be added to this archive, please let me know

    about it. The short lesson here is that it's never a

    waste of time to look over and understand the

    published data that supports proposed installation of a

    device.

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Mar 18, 2011 9:03 pm Post subject: Toggle switch keyways redux

 	  Quote: 	
		      Years later, I have no recollection of why I chose

    to reference the illustration key-way up . . . flip

    of the coin I guess. In any case, a degree of confusion

    would no doubt have been avoided had I translated more

    accurately from the data presented in the manufacturer's

    catalog data.


	


     Actually, now I do recall. We were just beginning to

     consider the utility of 2-pole, progressive transfer

     switches. In particular the 2-10 for OFF, BAT, BAT+ALT

     function as a DC PWR MASTER and the 2-50 as an OFF,

     PUMP, PUMP+PRIME functionality for fuel systems. The

     -50 switch would be oriented such that the PUMP+PRIME

     position was spring-loaded back to center for PUMP

     only. The the spring loaded position was on the key-way

     side, hence . . . key-way up became the "AEC convention"

     if you will for use of these switches in the Z-figures.



     Stir the gray matter gently and with patience. Never can

     tell what useful data might bubble to the surface. . .

   Bob . . .

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