Rated voltage (Un) (of the ASSEMBLY)
The ASSEMBLY manufacturer shall state the rated voltage(s) necessary for correct functioning
of the ASSEMBLY.
Rated operational voltage (Ue) (of a circuit of an ASSEMBLY)
If different from the rated voltage of the ASSEMBLY, the ASSEMBLY manufacturer shall state the
appropriate rated operational voltage of the circuit.
The maximum rated operational voltage of any circuit of the ASSEMBLY shall not exceed its
rated insulation voltage.
Rated insulation voltage (Ui) (of a circuit of an ASSEMBLY)
The rated insulation voltage of a circuit of an ASSEMBLY is the voltage value to which dielectric
test voltages and creepage distances are referred.
The rated insulation voltage of a circuit shall be equal or higher than the values stated for Un
and for Ue for the same circuit.
NOTE For single-phase circuits derived from IT systems (see IEC 60364-5-52), the rated insulation voltage
should be at least equal to the voltage between phases of the supply.
Rated impulse withstand voltage (Uimp) (of the ASSEMBLY)
The rated impulse withstand voltage shall be equal to or higher than the values stated for the
transient overvoltage’s occurring in the system(s) to which the circuit is designed to be
connected.
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