A wire from an actuator (tortise, servo, etc.) through a hole in a throw bar made from PC board, could touch foils on both sides. I build my turnouts in place and only use PC tie material for the throw bar. I normally have the actuator hole in the middle of the throw bar. I cut the top foil on both sides of the actuator hole and the bottom foil in one place. The only low current short issue I had is if I recently ballasted and it is still damp. One the ballast is completely dry, I have no problems.