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(b) For DC power lines: ±0.5 kV test voltage in open circuit between line and earth and ±0.5 kV between lines (pulse 1.2 µs / 50 µs) with a rise time (Tr) of 1.2 µs, and a hold time (Th) of 50 µs. Each surge shall be applied five times with a maximum delay of 1 minute. |
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