For cables that have elliptical cross-sections, how should the cross-sectional area calculation for wire fill be determined?

The appropriate method for calculating the cross-sectional area of cables with elliptical cross-sections involves using the major diameter of the ellipse as the diameter of a circle. This approach is correct because the major diameter represents the largest width of the ellipse, which provides a better indication of the space occupied by the cable in typical applications. When determining wire fill, it is essential to assess the maximum cross-sectional area effectively, as this significantly affects cable performance, heat dissipation, and compliance with safety regulations.

Using the average diameter or minor diameter would not accurately reflect the effective cross-sectional area for wire fill, potentially leading to underestimations of space usage and affecting the performance of the electrical system. Ignoring the elliptical shape entirely undermines the geometric characteristics of the cable, which are crucial for calculating accurate fill ratios and compliance with industry standards. Therefore, employing the major diameter of the ellipse ensures a valid and practical assessment in line with established code standards.