C Values for Short Circuit Calc.

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JJUDGE

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I am doing a short circuit calculations for a well site. And I can't find the C (conductor constant) value for a overhead service drop. I know the available Isc from the utilities transformer. I can find the tables for C values of Conductors in a Busway and in a Conduits. But I cannot find the C values for a conductor in free air, for the overhead runs from the pole mounted x-former to my ses. I am using the point-to-point method.
 
That is the table's I have. Shouldn't there be a different table for conductors that are not in a busway and not in a conduit. One just for free air, such as a overhead drop. Or do I use the values for Nonmagnetic conduit?? In table 2 of word doc.
 
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