Casey Multi-pole slide switches are available and can be simply mechanically interlocked to the on posiion. 4 pole dt are not that uncommon. still a single point of failure but on a single actuator. George Shaiffer
Date: Wed, 22 Jun 2011 21:01:04 -0700 From: [email protected] To: [email protected]; [email protected] CC: [email protected] Subject: Re: [altusmetrum] Telemetrum Switch Wiring for NAR Level 3 Thanks for the advice, guys. I'm still in the early stages, just scoping a parts list. I believe my planned backup unit (a Raven) also has a common rail for its outputs. So in total, I'd need to switch four circuits to separately isolate the outputs. I was thinking about using DPST switches, but after getting burned by a switch on my Level 2, I'd rather not run my primary and backup through a single point of failure. I could run each altimeter and its own outputs through a single DPST, but that almost seems to defeat the purpose of having separately-switched outputs. I'll run all this by my L3CC, once I figure out who that's going to be. Thanks again, Casey On Wed, Jun 22, 2011 at 7:59 PM, Bdale Garbee <[email protected]> wrote: On Wed, 22 Jun 2011 18:22:11 -0700, Casey Barker <[email protected]> wrote: > I was hoping I could get away with just the one switch for the Telemetrum, > plus whatever switch(es) my (heterogeneous) backup needs. Otherwise, I can > see my avionics bay quickly turning into a bit of a rat's nest. Keith's advice is spot-on. You need to talk to your L3CC about this. They don't all feel the same way, and what one thinks is great another may be very uncomfortable with. I personally used a separate DPST switch to break the common return from the igniters on each of the two altimeters in my L3 project to satisfy my L3CC's expectations. I'd be happy to review your proposed design before you build it if you'd like. Bdale _______________________________________________ altusmetrum mailing list [email protected] http://lists.gag.com/mailman/listinfo/altusmetrum
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