Cable Reel Capacity / Length on Reel
How many feet of a given cable fit on a reel (or how much is left on a partial reel): length = fill x pi x (flange^2 - drum^2) x traverse / (48 x cable_OD^2), lengths in inches. A 30 in flange, 12 in drum, 18 in wide reel holds ~801 ft of 1 in cable; a fatter 1.5 in cable drops it to 356 ft, since the cable OD enters squared. The figure that tells the crew whether the pull is on one reel or two.
Formula and source
length_ft = fill_factor x PI x (flange_dia_in^2 - drum_dia_in^2) x traverse_width_in / (48 x cable_od_in^2).
Reel-capacity identity by name (annular winding volume / cable cross-section, with a fill factor); first-principles geometry.
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