I am having a bit of a problem understanding the proper meaning to a particular article in NFPA 70. In 220.5 (A), it states that "unless other voltages are specified, for purposes of calculating, branch and feeder loads, nominal systems voltages of 120,120/240, 208Y/120, 240, 347,480Y/277, 480, 600Y/347, and 600 volts shall be used". From what I am understanding, if you are making a product and a customer gives you a voltage other than the listed nominal voltages you are still covered under the "unless other voltages are specified". This could occur selling products overseas. The question I am blurry on is you make a product sold globally (US included), can you specify your own voltage to fit the market area you trying to push your product?
As a side note, on a nameplate marking. If you calculate using a different nominal voltage, should that be the listed voltage on the nameplate? I would think yes, but if anyone has any other thoughts on it would love to hear it.