I fully agree, but I have no motors that can be strapped for 208. As I said, my Bridgeport is wound for 230. I don't recall what the Graziano demands, and the motor is internal--not readily available. I just know that it runs well on 240, so why risk anything? The induction furnace is wired 220/440. It would be within range, but the huge amperage demand makes running at a slightly higher voltage an advantage over running lower. Not necessarily for wire size, but, again, for heat control.
I understand that, but the cooler operation is certainly a benefit.
No, what I'm assuming is that the majority of the machines would be running in the tolerance zone, unnecessarily. Given a choice, why would I want any of my machines to run under voltage? Even within tolerance? Over voltage is far superior to under voltage if one must deviate from the ideal.
Could be, but I'd not be willing to gamble on it. Good example is the induction furnace, although it's not one of the machines that falls out of the tolerance zone (220/440 in this case). The motor generator weighs almost three tons, and is water cooled, not fan cooled. That means it has the potential to run hotter than I would like because it relies on heat conduction with small coils of circulating water wrapped around the exterior of the assembly. Adding any unnecessary heat to its operation would not be in my best interest, especially if it had the potential for failure. I can't speak for you, but I couldn't afford to pay for a rewind on something of that magnitude.
Dunno. As I said, I don't recall, but he has since built his own place and has it wired according to his needs. Can't help but think it's delta, but I couldn't swear it is. For all I know, he may be wired 480. I'll try to remember to ask him the next time we talk on the phone.
All well and good if you choose to use a wye service, but I chose to eliminate that problem. I'm as happy as if I had good sense. Even *if* one can get around the licensed electrician, you still face the cost of the buck/boost transformers, which, at a minimum, would cost at least $300 per machine, assuming you could get away with two instead of three. You also have the cost of mounting them, and the inconvenience of them being in place, adding considerably to the bulk of the machine, with no benefits. No thanks.
Nope! Wrong again. I am paying for two services in spite of my choice of delta over wye. *ANY* 3 phase service is considered industrial where we live. Had I run everything through the CT can, avoiding the meter base, I'd be paying for my power at a higher rate because I'd exceed the maximum (demand meter). Our meter base is a 375 amp unit, so we feed both the shop and the house from it, at a residential rate. It's simple------if I wanted three phase service, and I did, I had to pay for two services, like it or not (and I don't). As much as I may not like the cost, I'm very happy to have the convenience. I explored the idea of phase converters and quickly dismissed the idea. Way too expensive, considering the load I had with the induction furnace. I had two choices had I chosen phase converters-----buy one huge unit and pay for the idling current endlessly, or buy a few small units and bring them online as needed, still paying for idling current. It was cheaper, and far more convenient, to pay for three phase service.
To the best of my knowledge, I chose the right service for my needs. Considering I have nothing that is wired for 208, nor can any of it be rewired to accommodate that voltage, I sure as hell didn't want it in the shop. If industry today is headed that direction, and machine tools are so wired, that's a whole different situation, and I'd have no quarrel with the choice. With the machines I have, that wasn't one of the options, and I sure as hell wasn't going to spring for transformers that weren't necessary, not when all I had to do is request the right service.
Again, a judgment call. I have one device with that load. Why would I pay for 480 service, add an additional panel, then transform for everything else? Personally, I think I made some excellent choices. Everything I have runs as it should, and I haven't filled the shop with unnecessary transformers. Idling current alone would have been expensive in the long haul had I chosen that path. I have only one machine that *requires* 480 volts, a German made universal cylindrical grinder, which cannot be strapped for 240 volts, or anything within reason. The only time the transformer will be energized is when I use the machine. There will be no idling consumption otherwise, so I won't be paying for making heat. Regardless of your opinion, I feel I've done a damned good job of addressing the problems at hand. Your bias against delta service seems to be a much greater stumbling block for you than my choices are for me. Very strange, Pete. However, I think if you visited my shop and observed how nicely it all has come together, I think you might find yourself agreeing that I did the right thing. :-)