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1. 10:54 AM - Re: CB polarity? (Robert L. Nuckolls, III)
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| Subject: | Re: CB polarity? |
At 09:08 PM 4/17/2022, you wrote:
>"johnbright" <john_s_bright@yahoo.com>
>
>I'm not using this type of breaker but
>curious why is it marked for polarity?
There is a constellation of reasons for marking
the input and output connections for breakers,
switches and relays. On of many explanations can
be found here:
https://tinyurl.com/y5zge76c
Standardization specs call for marking terminals
on such devices if it 'makes a difference'. Instances
where it does make a difference includes specialy
breakers with internal features beyond the
rudimentary need to protect a wire from fault
damage.
A manufacturer can choose not to mark inputs and
outputs if their device doesn't care . . . or if
they want to avoid a qualification test that
demonstrates tolerance to a reversed flow.
In small breakers typical of applications
in aviation, the LINE/LOAD labels would be
significant only if there's a third terminal
common to specialized electronics inside the
breaker (soft fault detection, remote trip,
etc).
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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