How should I choose between 6.6/11kV and 12/20kV ratings?

Q: How should I choose between 6.6/11kV and 12/20kV ratings?

The choice depends on the system’s grounding. In the international market, Category A systems (fast fault clearing) can use lower insulation ratings, while Category B or C systems (where a fault can persist) require thicker insulation (higher voltage rating) to ensure safety during the fault duration.

Question

Accepted Answer

The choice depends on the system&#8217;s grounding. In the international market, Category A systems (fast fault clearing) can use lower insulation ratings, while Category B or C systems (where a fault can persist) require thicker insulation (higher voltage rating) to ensure safety during the fault duration.