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Standard voltages - What is standard? I am trying to determine a standard for design, and I notice that industrial companies throughout the US use the following 3-phase voltages; 208, 220, 230 440, 460, 480, etc; Canada using 575VAC. Even if you consider +/-10% of nominal voltage, conditions exist in which voltages may be too high for supply to a machine. If a 3-ph Isolation transformer is used with 5% taps, I've just added greater cost and another enclosure to my small workcell. Is the common nominal voltage supply "creeping" upward from 440VAC 3-ph to 460, 480, etc. just as the nominal "120VAC" 1-ph did? (110VAC to 115VAC to 120VAC; Or maybe I am completely "off-my-rocker" associating the two...)
I am looking only for references to a standard indicating typical/nominal values, or replys from individuals with some time spent in industrial design.
I am looking only for references to a standard indicating typical/nominal values, or replys from individuals with some time spent in industrial design.