The cable-to-conduit fill ratio is a critical parameter for a safe and efficient cable pull. It represents the percentage of the conduit's internal cross-sectional area occupied by the cables. Industry standards like the NEC (National Electrical Code) provide clear guidelines to prevent "jamming" and reduce pulling friction.

• For one cable: Maximum fill is 53%.

• For two cables: Maximum fill is 31%.

• For three or more cables: Maximum fill is 40%.

Adhering to these ratios ensures enough space for the cables to move freely, especially around bends, which is crucial for preventing damage to the cable jacket and reducing the overall pulling tension.