This is not really a plc question but I am sure for many of you this will be a simple question to answer. I have an old machine that has several safety or stop motion sw. that are 24vdc to grounded frame. The switches are exposed and when they go to ground it turns on a 24vdc cube relay (470 ohm across the coil if that means anything )and stops the machine. If you happen to be touching the switch and the frame when the switch makes or breaks it will give you a small bite. Not bad but just catches you off guard if you are not expecting it. How can I prevent this. High ohm resister across the coil? how would I calculate the ohms? diode? snubber? Any thoughts?