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By certification 
Insulator Corona Ring:
Grading ring is necessary when voltage is ≥ 110kV
Grading ring is necessary when voltage is ≥ 220kV
And different types of end fittings are available based on customer's request
Grading ring is necessary when voltage is ≥ 110kV
Grading ring is necessary when voltage is ≥ 220kV
And different types of end fittings are available based on customer's request
