Re: symbol meanings

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Subject:		Re: symbol meanings
From:		Dan Brown (dan@familybrown.org)
Date:		Thu Aug 28 - 7:25 AM

Quoting Andrew Butler <andrewbutler@ireland.com>:

> I mean, how can a switch be Normally Open AND Normally Closed. I noted

This often happens with momentary switches.  They'll have three  
terminals--Common, NO, and NC.  With the switch at rest, the circuit  
from Common to NO is open, and from Common to NC is closed.  When the  
switch is activated (pressed, etc.), this reverses--Common to NO is  
closed, and Common to NC is open.  So, it's Normally Open or Normally  
Closed depending on how you wire it.

-- 
Dan Brown, KE6MKS, dan@familybrown.org
"Since all the world is but a story, it were well for thee to buy the
more enduring story rather than the story that is less enduring."
  -- The Judgment of St. Colum Cille