Some Home Depot’s use that same setup for 200 amp latching lighting contactors. Usually 120 is preferred because the control contacts are rated 250 or less.
MCCs and some stand alone combination starters...have never even seen a pump panel like you are talking about.
That always been my question. You end up bypassing limits. I don't know why they do this. Only one that I am aware of that does it, and has been doing it probably since they first started building these. They can use one less conductor in the cable that is run on these systems than what everyone else uses is the only advantage but there is disadvantages as have been brought up. I'm pretty sure they are listed. This company been building them that way for 50 or more years.
Even if the machine is listed as is?
I would have to find and read the actual product standard that the equipment was listed to.
Can remember working on 240 & 480 volt 1 to 5 ton traveling hoists with some traveling outdoors on an I beam that had 240 or 480 volts to push buttons then by the end of the 1970's all of the hoist we purchased used 24 volts AC for the controls. Got shocked on a old hoist where the ground wire broke off. Installed a lot of Allen Bradley size 0 & 1 480 volt starters that had 480 volt start stop & light kit that were bolted to holes that were inside of NEMA1 starter enclosures. Had to knock out a piece on starter cover. Never had one short out or cause a problem. Large plant that I worked at had two old candy starch mogul machines that used 480 volt for all controls in dust filled space. Everything was done for explosion proof wiring except they refused to ever place sealing compound in any of the seal off fittings. Must have had at least halve a dozen limit switches feed with 480 volts and worst yet while changing over to 120 volt controls found they had the #14 guage control wire feed from a 30 amp time delayed fuse. Controls only fed about eight motor starter coils and some indicating lights.
All I can say is this company been making them that way since the late 1960's and new systems today still use a grounded conductor as the "safety circuit" for the main control. Any limit throughout the system will interrupt the return portion of this grounded conductor. It runs all the way to end of the system, all intermediate motor contactors connect to it as a "common", but then a return conductor has all the safety limits in it on the way back to the main control panel. Back there it ties to the holding contacts on the main contactors. Start button bypasses the holding contact and allows the system to run while holding start button, this is how you get it back "in line" if it stopped because it was out of line. Of course you need to fix whatever caused it to get out of line or if you hold it too long it just gets further out of line, possibly until something breaks.
Oh, pivots.
It's nice when coil voltage is the same as load voltage. Easy.
I'm sure you are familiar with the Reinke center pivots and using the grounded conductor for the safety loop through the length of the system.
For single motor or other somewhat limited applications.
