> Ed Kozlowsky wrote:
> If you don't isolate the frog, it will short because the rails connected to
> it on the side away from the points are opposite polarity.
Hi Ed....The "opposite polarity" problem is easily solved by cutting a gap at
the appropriate locations and feeding power from the point side. This problem
does not require isolated frogs for a solution.
>If you don't isolate on the point side, you would have to either rely on point
>contact to switch the polarity of the point rails or you would need to install
>a switch.
Yes, that is true. But that does not lead to the conclusion that isolated
frogs are necessary and/or the only solution. Keep in mind that thousands and
thousands of turnouts were built and operating long before DCC was invented and
the isolated frog concept became popular.
>I don't power my frogs, so isolation is mandatory to prevent a short.
Yes, but that is a choice you made. Isolation is not necessary when
considering the bigger picture. You simply chose a solution that required
isolation. Isolation is not required by many other solutions.
"S"till looking for a reason why isolation is NECESSARY. I agree it is one of
several alternatives, but it is not mandatory and it is not the only solution.
"S"miles....Ed L.
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