Maybe an assumption on my part. I couldn’t figure why he would want to put gaps in an uninstalled item.
He wants to power the frog separately so he can control polarity with a Tam Valley Frog Juicer. Isolating the frog is a pretty standard procedure for Peco Electrofrog turnouts.
Dave
Yes, got that part. But the frog is pretty well isolated until such time that some track is connected to the frog end of the turnout. As others said, a couple insulated rail joiners would accomplish said isolation unless track was already laid.
My understanding (limited as it may be) is that the closure rails on the Peco Electrofrogs are connected to the frog rails. More recent models have gaps already cut between the frog and closure rails but there are jumpers that must be removed in order to isolate the frogs. Older models did not have the gaps with jumpers, so the track had to be cut. I have a bunch of older HO Peco Electrofrogs where I had to do that in order to make them DCC friendly.
Here is what I have used as a reference for wiring the turnouts:
http://www.wiringfordcc.com/switches.htm
Dave