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Voltage Designation



Nominal Voltage- The characteristic operating voltage of a wire or cable that is referenced to define its electrical rating.

The nominal voltage in European applications is expressed by the combination of two values expressed by the designations Uo/U, where:

Uo: The voltage between any insulated conductor and shield or ground.

U: The voltage between any two conductors of a multi-conductor cable.

Example 1:

P/N 26157- The nominal voltage is expressed as 300/500 V. How do these values correspond to one another?

The first voltage always refers to Uo, the second refers to U. Therefore;

Uo: 300 V, voltage between any insulated conductor and shield ground.
U: 500 V, voltage between any two conductors of a multi-conductor cable.


Voltages are expressed in terms of Alternating Current (AC). A conservative estimate of the amount of Direct Current (DC) voltage is 1.5 times the AC Value.

Example 2:

P/N 26157- We know the Uo= 300 V and U = 500 V from the above example. The estimated DC voltage would be as follows:

Uo: 300 Vac x 1.5 = 450 Vdc
U: 500 Vac x 1.5 = 750 Vdc
    
 
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