The best place for transient protection is near the actual device or circuit to be protected. The spike can be generated by any inductive device, motors, track switches, trackside accessories, or the transformer. The transformer is not the only device that can generate damaging transients, they can come from many sources. As we have discovered in some testing done by Adrian, even the chokes we use to improve DCS performance can, under the right circumstances, generate damaging transients.
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