coffeebean
Senior Member
- Location
- Mercer County NJ
Can the line and load be in the same conduit for a variable-frequency drive?
Can the line and load be in the same conduit for a variable-frequency drive?
Can the line and load be in the same conduit for a variable-frequency drive?
FWIW, I think it's a bad idea.
I would have thought that, as a rule, the supply and the motor would be in two different locations making it a bit impractical to use a common conduit for all the conductors.I am inclined to agree that in general it is better not to do this.
However, there are cases where one can run into situations where routing two conduits to a VFD is difficult where one might want to take a closer look.
I am inclined to agree that in general it is better not to do this.
However, there are cases where one can run into situations where routing two conduits to a VFD is difficult where one might want to take a closer look.
Do not route more than
three sets of motor leads in a single conduit to minimize “cross talk”. If
more than three drive/motor connections per conduit are required,
shielded cable must be used.
I did not see any restrictions either in this manual or in the general AB drives instruction manual about not routing input power and VFD output in the same conduit. Maybe it is there, but I cannot recall ever seeing it, and I specifically went looking for such a caution just now.
In fact, I don't recall seeing it in any VFD manuals, but I mostly use AB drives.
I looked thru the manual for a Baldor drive I used last year and did not see anything there about this either.
Symmetrical power cable equipped with compact low-impedance shield and intended for the specific mains voltage. 360? earthing of the shield with cable glands in both ends needed for EMC levels C and H.
Possibly so.This is a tangent on the topic, but I tihnk the NEC eventually needs to address the issue of non-sinusodial and high frequency current rating of conductors along with derating for multiple conductors.