can you feed 2 vfd's from 1 disconnect? Here are the specs. 230v 3phase power. I have A 60amp breaker with #6g wire going into a 60A non-fusible disconnect.
Then was wanting to feed 2 vfd's with #10g wire out of the disconnect to 30a fuses for each vfd. The motors after the vfd's are rated for 26a fla. So 60a breaker(6g)>60a disconnect>(10g)30a fuses>vfd's(10g)>26fla motors. I hope I explained that right. Thanks for the help!
Where are the fuses going to be, in the VFD cabinets with no additional disconnect? Not a good plan. If one fuse blows and the only disconnect is the 60A one feeding both drives, you lose both drives when you have to shut down, troubleshoot and replace a fuse (or drive). I prefer having a disconnect for each individual drive. It’s simpler, cleaner and safer. The exception would be if the two drives are feeding a machine in which, if one goes down, the entire machine must be shut down anyway. In that case you can do what you planned, but as Bob said, you must then follow the Feeder Tap rules.
What size fuse and type of fuse you need for each drive is dictated by what the drive is listed with. You cannot just pick one out on your own, you must follow the drive mfr instructions. Bob is correct on that too, the UL listing standard for VFDs HAS changed relatively recently and fusing has become much more strict.
Side note: SCCR for non-fused disconnects has become problematic too. Although a few have been series listed with
specific breakers of the
same mfr as the switch, most are not so they typically only carry a 10kA SCCR at best, some are as low as 5kA.