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Conduit Fill Calculator

NEC Chapter 9 fill with wire-area picker, conduit picker, derating hint and spare verdict. 4 inputs, 4 outputs with grouped results.

Inputs

Wires

Sets area from Table 5.

Same-size current-carrying plus ground as counted.

Raceway

EMT areas from Table 4.

More than 3 CCC?

Ampacity adjustment trigger.

Result

Raceway fill
Waiting for calculation.
NEC limit
Waiting for calculation.
Fill compliant (1=yes)
Waiting for calculation.
Spare fill
Waiting for calculation.
Screening calculation only. Verify against NEC articles cited on the page and the equipment nameplate; the authority having jurisdiction governs.

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Workspace

Keep the assumptions with the result.

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