A cable in conduit chart is a reference table that cross-references the physical size of electrical wires against the internal area of electrical conduit (pipe). It tells you the maximum number of wires of a specific gauge (AWG) and insulation type that can legally fit inside a specific trade size of conduit (e.g., 1/2", 3/4", 1").
This guide provides an overview of how to read these charts, the rules governing them, and standard sizing examples for common cables like THHN and Romex (NM-B). cable in conduit chart
When placing NM cable in conduit, the conduit fill is based on the of the cable, not its individual wires. Per NEC 334.80, you must use the major diameter of the cable for fill calculations. A cable in conduit chart is a reference
Here's an example of how to read a cable in conduit chart: When placing NM cable in conduit, the conduit
| Conduit Size (inches) | #12 AWG | #10 AWG | #8 AWG | #6 AWG | #4 AWG | #2 AWG | #1/0 AWG | |-----------------------|---------|---------|--------|--------|--------|--------|----------| | 1/2" | 9 | 6 | 3 | 2 | 1 | 1 | 0 | | 3/4" | 15 | 10 | 6 | 4 | 2 | 1 | 1 | | 1" | 25 | 16 | 9 | 6 | 4 | 3 | 1 | | 1 1/4" | 40 | 26 | 15 | 11 | 6 | 4 | 2 | | 1 1/2" | 54 | 35 | 21 | 15 | 9 | 6 | 3 | | 2" | 85 | 56 | 33 | 24 | 14 | 10 | 5 |