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Central Office Application to ITU-T Recommendation K.20
The test level of 1000 V 10/700 delivers a peak short-circuit current level of 25 A. A series resistor is required to ensure coordinated operation with the primary protector at the 4000 V test level. The resistor value will be set by the sparkover voltage of the primary protector. A sparkover voltage of 300 V will give a 300/25 = 12 §Щ series resistor.
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