Discussion

In summary, then, I believe the authors should be commended for making available these data and calculating procedures. I think that the simplified forms proposed in this discussion should be considered as alternative methods for calculating current ratings. The subject of calculating the effect of sun on the current rating needs further clarification with respect to sky radiation and sky temperature. Finally, I find it interesting that two separate organizations have been studying the same problem along exactly parallel lines, and while our investigations have not yet been completed, I must point out that in substance, we have checked, experimentally, the conclusions reached by the authors. It is apropos to suggest, therefore, that an Industry Committee be formed to consider the suggestion already made to our own organization. We feel that existing current-rating tables should be revised to reflect the more realistic values for standard conditions of 75 C conductor temperature, 25 C ambient temperature, and a crosswind velocity of 2 fps.