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Maximum length depends on cable capacitance (and pullup resistors).
See the technical caracteristics of I2cbus.
I try successfully 10 m of cable in I2cbus @ 100KHz.
For I2cBus there is a bidirectional buffer for decreasing source impedence of a factor 10.
You can increase the cable length by using current source instead of a simple resistor... if the current source is let say 2 mA you can use a cable much longer than would be possible if you use a resistor with the same current.
use a good shielded cable and buffers if possible.
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