Output VFD Cables in a Single Conduit

[emartinez]

Due to project constraints, I am proposing to use a single existing conduit to run 4 separate VFD shielded cables to 4 separate motors ~450 ft. Is this possible? I understand it’s not advisable, but I just wanted to run it by here first for other input.

We are planning on using the X-Olene - Okoseal Shielded VFD cables.

 

[Boingo1972]

As you mentioned it's not advisable but the sheilding on the cable is really important to minimize the "cross talk". That cable you're planning on using has a 5 mil copper tape shield which is standard. But it has an overlap of only 25%, meaning half of that shield will be 10 mils thick but the other half will only be 5 mils thick. It would be better to find one with a 50% overlap wherein the shield will be 10 mils thick the entire lenght. A lot will depend on the voltage and voltage spikes the motors will generate. Even better would be to use a CCW VFD cable and forego the conduit alltogether and properly space each one.