Answer / dr rajan

There is no formula. It is always a thumb rule. The dielectric
break down of air is about 6kv/cm of gap. So depending on the
terminal voltage, use a rational distance keeping in mind the
connecting terminal dimensions of the cable. An average of 15
cm space between phases in 11Kv accepted as a practice.

Why more than 2.5 MVA distribution transformers (secondary is 440V)are not used in india.

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How phase to phase voltage comes 440V.

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