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n8zg(at)mchsi.com
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 Posted: Wed Jan 06, 2010 4:25 am Post subject: Question about 16V POLYFUSER Radial Leaded Resettable PTC |
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No sir. We put switches on electrical circuits to provide On/Off control of
the load under normal operations. Once an overload condition manifests,
operations are no longer normal. Powering a circuit that you know has
experienced an overload invites smoke, flame and fury in a confined space
with no reasonable exit.
War story follows:
Standing nuclear alert in the missile fields around Cheyenne, WY, our
procedures allowed ONE attempt to reset a tripped circuit breaker, after a
specified cool-down period. Smoke in the capsule is bad, and getting out is
neither easy nor quick.
Neal
I can understand the concern for a circuit resetting itself after the power
is restored...but isn't that a reason we put switches on things?...Like
leave that circuit off if it has a problem...
Sorry, just don't see the design as having much of a downside. If you think
you may accidentally turn the thing back on, put some red tape on the switch
or something...pull the wire.
Al
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al38kit
Joined: 13 Jul 2009
Posts: 21
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| Posted: Wed Jan 06, 2010 7:24 am Post subject: Re: Question about 16V POLYFUSER Radial Leaded Resettable PT |
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Neal...having spent some time in the military myself, I know there is often not much thinking that is to be done, and a procedure for almost everything...
That being said and that we are no longer held to that kind of procedure, what's the down side to leaving the switch off?
I'm not advocating that one re-power the circuit, as your reply suggests.
No one says you have to reset it.
My understanding is that once the electrons are removed from the circuit, it's dead.
(Sorry I mentioned anything about what a switch was for).
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Neal.George(at)hurlburt.a
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| Posted: Wed Jan 06, 2010 9:54 am Post subject: Question about 16V POLYFUSER Radial Leaded Resettable PTC |
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I set the premise poorly - let me try again.
On alert, operating a nuclear delivery system, the goal is to maintain
maximum operational capability and flexibility. To that end, the Technical
Order REQUIRED _one_ attempt to restore a tripped circuit breaker, forbade
more than one attempt, and also forbade holding an offending CB closed. In
this situation, the down side to leaving the switch OFF is some reduction in
either capability or flexibility, depending (of course) on which system is
compromised.
On the other hand, NOTHING electrical (except the spark-maker) on my RV is
so critical to my continued survival that it will require troubleshooting
before I get on the ground comfortably. My panel contains exactly one
breaker - the Crowbar OVM. If it trips, I leave it alone, enable the SD8
and decide whether to land soon or later.
=============
Neal...having spent some time in the military myself, I know there is ofter
not much thinking that is to be done, and a procedure for almost
everything...
That being said and that we are no longer held to that kind of procedure,
what's the down side to leaving the switch off?
No one says you have to reset it.
My understanding is that once the electrons are removed from the circuit,
it's dead.
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