3-phase supply, overvoltage catogory, line-to-neutral and working voltage (IEC 61010-1)

Benjamin Weber

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#1
Dear community,

I am having trouble with determining insulation requirements according to IEC 61010-1 (unfortunately no separate forum for that standard) and I am pretty sure there are some smart people here, who can help me.

Creepages, clearances and test voltages are all based on the overvoltage category in the first place. The overvoltage category is determined by the line-to-neutral voltage of the mains supply and the expected transient overvoltages. A supply mains with single phase 230 V line-to-neutral and expected 2,5 kV transient peaks is category II. So far I understand. The working voltage is the lline-to-neutral voltage of 230 V.

But what about a 3-phase supply mains with again 230 V line-to-neutral and 400 V phase-to-phase and 2,5 kV transients between each phase and neutral. This is still category II, isn't it? Here we have two different woring voltages: 230 V (l-n) and 400 V (ph-ph).

Now my problem: In IEC 61010-1 for such a three-phase system, which requirements are applicable according to subclause 6.7.1.5?
  1. Subclause 6.7.2 for cat II with up to 300 V nominal supply voltage
    OR
  2. Annex K.1 for cat II with over 300 V?
In my oppinion it would be (1) cat II with up to 300 V. My point is, that there is no further dependence from the actual working voltage of 400 V (ph-ph). I think that the required creepages, clearance and test voltages should be greater in this case, than in the single-phase case with 230 V working voltage.

If it was Annex K.1: In the tables here there is also no value for the working voltage, but only for the line-to-neutral voltage.

Coming from the IEC 60601-1 world, I assumed, that I find some tables where I can select the line-to-neutral-voltage (here 230 V) than overvoltage category/expected transient voltage (here II or 2,5kV) and then the working voltage in the relevant circuit (here 400 V phase-to-phase) - like in IEC 60601-1, table 13.

I hope I explained my problem and somebody can help me.
 
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