If you have a 30 cm (12 in) wide data tray, what does ANSI/TIA 569-B recommend be the maximum pathway fill cross sectional area assuming a MAXIMUM pathway depth of 15 cm (6 in)?

112.5 sq cm represents only 25% of the tray's total cross-sectional area, which is more restrictive than the 50% maximum the standard requires.

150 sq cm represents approximately 33% fill, which is below the 50% maximum and does not reflect the correct calculation from the standard.

Per ANSI/TIA 569-B, the maximum pathway fill for a cable tray is 50% of its cross-sectional area. A 30 cm wide by 15 cm deep tray has a total cross-sectional area of 450 sq cm (72 sq in). Applying the 50% fill rule yields a maximum allowable fill of 225 sq cm (36 sq in), which prevents cable damage, eases heat dissipation, and allows for future cable additions.

300 sq cm represents 66.7% of the total cross-sectional area, exceeding the 50% maximum fill allowed by ANSI/TIA 569-B.

450 sq cm is the full 100% cross-sectional area of the tray, which would completely fill it and violates the 50% fill rule.