Read up on the NCE block detector circuit. See no need for that,at least with 3 rail track.
Hi Dale,
I assume you're referring to the NCE BD20 current detector that Matt asked about early in this thread. You are correct, they are not needed in 3-rail. We used insulated outside rails throughout the NWTL with excellent results.
However, Matt is now moving into 2-rail where some form of additional detection hardware is required. My reply was quite specific in making that distinction. The BD20 is an excellent choice for anyone working with DCS in 2-rail for several reasons. First, it works well with a star wiring pattern. Second, it doesn't cause any interference with the DCS signal. Third, it functions without any external power supply. There are many choices for detection in 2-rail and the BD20 isn't perfect in all scenarios, but it is a very good choice in most cases.
