What is the formula for the window space factor, when the output is 1000 kVA?

What is the formula for the window space factor, when the output is 1000 kVA? Correct Answer 12 / (30+kV)

10 / (30+kV) denotes the empirical value of window space factor for rating between 50-200 kilo-volt-amp. When the output is near 1000 kilo-volt-amp then the formula used is 12/(30+kV).
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