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IEC 60502-2 CLASS A&B VS. C

IEC 60502-2 CLASS A&B VS. C

IEC 60502-2 CLASS A&B VS. C

(OP)
With regards to IEC  60502-2, -4, I'm trying to understand the testing requirements for CLASS A&B vs. C high voltage cables and accesories.  It looks like the class c requires us to test our connector as if U = Uo.  A connector normally rated at 5.0 KVAC=U Class A&B, would need to be tested as if it were rate as a 8.6 KVAC=U connector for class c, but would still retain the 5 KVAC=U rating (class C).  Is this correct?

Additionally, a connector rated at 5 KVAC=U is often advertised as a 6 KVAC=Um (1.2 x U).  Is this a continuous operational max system voltage?  

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