Cable rating nomenclature

[qstorm]

A 300mm2 shielded XLPE power cable has the following marking embossed on its outer sheath: 1.8/3(3.6)kV. What do the figures in this nomenclature mean?

 

[nightfox1925]

1.8/3(3.6)kV

3 - denotes the phase to phase voltage rating

1.8 - denotes the phase to neutral voltage rating

(3.6) - extended rating? Im not quite sure about this.



GO PLACIDLY, AMIDST THE NOISE AND HASTE-Desiderata

 

[KJvR]

1.8 - RMS Power frequency voltage to earth of SUPPLY SYSTEM
3 - RMS Power Frequency voltage between phases of SUPPLY SYSTEM
(3.6) - Maximum rms power freq voltage between two phases for which cables are designed. This is the highest voltage that can be sustain at any time. This exclude transient voltages.

 

[qstorm]

So if the cable is new and were to be subjected it to an insulation resistance (Megger)test, would it be correct to set the tester to twice the phase-to-phase voltage rating of the cable (that would be 6kV)?