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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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How do you convert voltage line to voltage phase?

For questions of this type, it seems the main issue may be one of definitions and industry terms. See if this makes sense: Line voltage is a very ambiguous term. For instance

Can i use a circuit breaker with 420V nominal voltage in 520V line voltage nominal current of circuit breaker is 1600A if I can how much current can pass from this circuit breaker?

  NO! NO! NO!   The circuit breaker must be rated for the line voltage used. Exceeding this limit can cause catastrophic failure!   If you are really working on a 16

What is line voltage that it is understood to be any voltage?

Your question is confusing and probably reflects certain  misunderstandings. But I will attempt to give an answer.    household single phase line voltage is 110 VAC, 11