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What is nominal line voltage?

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'Nominal' means 'named'. So a 'nominal' voltage is the named voltage of a system. For example, when we talk about a 120-V or 240-V system, we are describing their nominal values, not their actual values which can change from moment to moment.
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What voltage is line voltage?

Line voltage (line-to-line voltage) in a polyphase system is the voltage between two given phases. The potentail difference between the line and nuetral ...230 volts. Betwe