maximum Operating Class 2

[samreen]

Normally where thte insulation of Cable is mentioned,a maximum operating class is defined like 600/1000V.What do 1000 signify in this statemnet.?

 

[MikiBg]

It signifies maximum RMS AC voltage that cable insulation can withstand continuously. 600V between any insulated conductor and earth (metal covering of the cable), 1000V between any two phase conductors. Take a look at IEC 60227-1

 

[7anoter4]

I agree with your explanation but I am afraid this is not the IEC correct number of standard.
From IHS Standards Store: IEC 60227-1 Document Information: Title:
Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V – Part 1: General requirements.
I think the correct number may be: IEC 60502-1 Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) – ch. 4.1 Rated voltages.

 

[MikiBg]

Looks like you're right. I referred to IEC 60227-1 as an example of U0/U definition, not as standard for exact type of cable.