nuckolls.bob(at)cox.net
Guest
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 Posted: Mon Dec 10, 2007 10:06 pm Post subject: Switch Rating (clarification of syntax) |
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At 11:32 PM 12/10/2007 -0600, you wrote:
| Quote: |
<nuckolls.bob(at)cox.net>
At 05:41 AM 12/11/2007 -0800, you wrote:
>Hi:
>
>I recently joined this group cuz I'm working on an aviation project and
>have been reading the Aeroconnection manual. In past non aviation
>projects I've bought switches from Radio Shack etc that I've used in 12v
>systems. The rating on some of these switches only gave the AC rating
>say 15A.125VAC. I always assumed that if it was good for 15amps at 125v
>it was ok for the same amps at 12v. However, I'm trying to understand
>how all this works now. So the question is, can you convert that AC
>rating to DC and if so, how. I read in the manual where there was a
>resistive, inductive and tungsten rating for switches but not a AC - DC
>conversion. I also saw that V x A = W but that would give the switch
>about a 156A rating which doesn't sound right. Sorry if this is a stupid
>question or if its in the manual someplace and I've missed it.
See:
http://www.aeroelectric.com/articles/Switch_Ratings.pdf
If you're designing a failure tolerant system,
then switch replacement due to a lapse in
judicious selection is a maintenance issue,
not a safety issue.
Bottom line is that just about ANY switch you
choose to try in your airplane is MOST likely to
die of old age as opposed to a ratings issue.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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