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Pull Box Sizing Calculator — NEC 314.28 Straight, Angle & U Pulls

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Input / result unit NEC trade sizes are conventionally expressed in inches; metric input is converted mathematically.Pull geometry Largest raceway in checked wall/row Use raceway trade size, not outside diameter.Sum of other raceway trade sizes in same wall/row For example, two additional 2 in raceways = 4 in total.Paired raceway carrying same conductors Angle/U only. Enter 0 when no same-conductor separation check applies.Proposed box dimension (optional) Enter 0 to calculate only the minimum.

Calculated result

22 in minimum

Angle pull wall requirement: 22 in

Same-conductor raceway separation: 18 in

Governing minimum checked dimension: 22 in

PASS — entered 24 in gives 2 in spare.

Show the working

1. Wall distance = 6 × 3 in + 4 in = 22 in.
2. Same-conductor entry separation = 6 × max(3 in, 3 in) = 18 in.
3. Governing checked dimension = max(22 in, 18 in) = 22 in.

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