Thanks Dan...

We have a customer that will not let us work on exposed wires with live voltage unless we have the full protection suits, balaclava, face shield, both pairs of gloves on and reaching out to hold on to the hand of GOD while working near the exposed wires. That was aggravating to say the least. To get around this we used a 6 X 6 NEMA 4 junction box, we put 4 momentary two position toggle switches for jumping circuits, 1 momentary three position toggle switch for the up/down control,and one momentary push button on the side of the box as the "safe" control while using the up/down toggle. We then outfitted all of their controllers with a molex plug wired up to the respective terminals. Now when we have to perform any testing, we do not have to wear the protective clothing. Out of this experience we only have assigned momentary toggle switches to use as a JUMPER when we are trouble shooting ANY unit. In addition the above named box is the only way we perform tests on a unit. We just use alligator clips instead of the molex plug on units that are not under contract. As we take over units under contract we install the molex plug, so we can quick connect/disconnect the test box. While not foolproof the momentary toggle switch has gave us a little peace of mind about left behind jumpers.

If you loose a field this will happen, had this happen more than once. Had it happen with a 1000fpm car very ugly.

I remember at Library Square, back in 1989, and one adjustor was using the OMT to check his governor tripping speeds, just holding his finger on the button, then "WHAM", broken machine room slab, as the car top roller guides poked right through the concrete. Scary.