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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 4207-2022 |
Method for determination of tracking resistance index and relative tracking index of solid insulating materials {译} 固体绝缘材料耐电痕化指数和相比电痕化指数的测定方法 |
China National Standards Method determination tracking |
 English PDF |
| GB/T 4207-2012 |
Method for the determination of the proof and the comparative tracking indices of solid insulating materials 固体绝缘材料耐电痕化指数和相比电痕化指数的测定方法 |
China National Standards Method determination tracking |
English PDF |
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