What is the nominal voltage?

The nominal voltage is the specified system voltage of the supply circuit that the power supply is connected to.

In the case of 3-phase systems, the nominal voltage is the voltage between the phase conductors.

The following standard convention is used on this website:

If AC or DC appears before a number, it is a nominal voltage or a nominal voltage range (e.g. AC 230 V, AC 100–240 V, 3AC 380–480 V, DC 12 V). Tolerances can also be specified for the nominal voltage or nominal voltage range (e.g. AC 230 V ±10%, AC 100–240 V -15%/+10%, DC 12 V ±25%). The total range is the working range of the power supply.
If V AC or V DC appears after a number, it is an instantaneous voltage value without additional tolerances. For example: DC 12 V is used to describe a 12 V battery, regardless of whether it is fully charged (13.7 V DC) or already discharged (10 V DC).

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