What is the GMR of equivalent single conductor?

Q.  Ds is the GMR of each subconductor of a four subconductor bundled conductor and d is the bundle spacing. What is the GMR of the equivalent single conductor?
- Published on 24 Nov 15

a. 1.09 √ (Ds * d3)
b. 1.09 √ (Ds3 * d3)
c. 1.09 (√ (Ds 3 * d3))1/4
d. 1.09 (√(Ds * d3))1/4

ANSWER: 1.09 (√(Ds * d3))1/4

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