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From: svserenity (no email)
Date: Wed Sep 03 2003 - 13:05:53 EDT
> ...windlass there should also be an override for the
> protection circuit that
> can be activated in the heat of a battle.)"
Excuse me? As Lew said. the circuit breakers are there
to protect the insulation, or the wiring. Overload
protection on individual equipment serviced by that
particular branch are there to protect the equipment.
Last thing you should want is some meathead deciding
'in the heat of battle' that the overload condition is
acceptable and should be overridden. Got a ammeter in
every circuit to base this decision on? You must be
joking.
> ...Yes I agree with you once again, a circuit
breaker
> or a fuse should be there
> as means to survive a malfunction. As said before
> my humble "WRONG" opinion
> is we should not rely on mechanical contacts to
> interrupt large currents on
> a regular basis. (BTW: relays also have mechanical
> contacts.) ...
Except solid state relays. Sigh. Nothing wrong with
the mechanical contacts in breakers used for their
intended purpose. They are designed with proper sized
contacts, speed, latency, and arc suppression to work
repeatedly.
I do agree breakers should not be tripping on a
regular basis. If a breaker trips you have either a
poor design (overloaded ciruit) that should be fixed
or a failure to be diagnosed in the wiring, equipment
connected, or the breaker itself.
I also agree it isn't rocket science. Simply buy
marine breakers for marine applications, dc breakers
for dc, ac breakers for ac. Follow correct guideline
for sizing wiring and breakers. If you have to ask if
the surplus 32V 400Hz breakers from the space shuttle
program will work on your boat then you don't know
enough to use them, go back to West Marine. All these
jury rigs in a boats electrical system aren't going to
make it past a competent surveyor anyway, and let's
face it, most of us use insurance companies that
require periodic surveys.
>
> BTW (By The Way) the phrase "Current Flow" is
> redundant. Current does not
> flow, "charge" flows, current is "rate of flow of
> charge". This is another
> misconcemption people have, just like the
> characteristics of molded case
> circuit breakers.
No misconception here, just semantics. We might as
well start correcting each others english. You need a
time out while you send out a lot of corrections to
text books, trade publications, test equipment makers,
etc, etc, etc. Unless, of course, Norm read this,
slapped his forhead while saying "I get it now", and
changes his electrical religous views.
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