Here are two definitions of nominal voltage:
A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g., 120/240 volts, 480Y/277 volts, 600 volts). The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment.and
Voltage by which an installation or part of an installation is designated.{Why is it I always have to go back and edit my posts? Why can't I write it right the first time?
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[This message has been edited by C-H (edited 09-26-2003).]