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Raceway Fill Calculator

Our online calculator includes common sizes for wire & cable types not listed in the NEC, including manufacturer-specific cabling

RACEWAY FILL CALCULATOR

Conduit & Wireway Fill

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NEC Raceway Fill Guidelines

Conduit

1 conductor:    53%

2 conductors:  31%

3 or more:          40%

NEC 2023 - Chapter 9, Table 1

Conduit

60% fill allowable on runs 24" or less

NEC 2023 - Ch 9, Notes (4)

Wireways

20% of the

cross-sectional area

NEC 2023 - 376.22(A)

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