The maximum length between vaults depends on system designs, customer requirements, and pulling equipment available.
The average pull normally runs between 500 and 1,000 ft., however, some systems require cable pulls over 2,000 ft.
How many 90-degree sweeps can one pull have before damage is done to the conductor? The rule of thumb in the industry is a maximum of 270 degrees.
However, some designs or requirements demand more but keep in mind every 90-degree sweep adds pulling tension to the pull.
The cable manufacturer normally recommends a maximum pulling tension for a specific size and type of conductor.
Remember a good conduit system is sized, installed, and tested (maundered) properly prior to installing the conductor.
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