control wiring in vfds

[NateDogg24]

I have always seen control wires pulled into vfd cabinets. i know that the control wire i use is 300v 75c wire and most of the wire inside the cabinet is 600v 90c. although the terminal blocks and such are seperated they may be in the same cabinet is it exceptable to use this type of wiring (cl3p) inside the cabinet and land it on the control terminal strip as long as it is kept off of the other wiring.

 

[petersonra]

Why would you use 300V wire for anything? It usually costs more then regular MTW.

 

[Flex]

Ive seen it done plenty of times, I also asked a similar question before... http://forums.mikeholt.com/showthread.php?t=116547

 

[daleuger]

Just did such an install last week. The condulets between the VFD's lead to a junction box of control wires on the wall to the right. 480V fed in from the trough.

View attachment 3697

 

[NateDogg24]

the control wire we use is cl3p and 300v is the rating it is a twisted shielded pair.

 

[NateDogg24]

the control wires in your picture look to be twisted shielded type wire, is that correct? if so it will mix with the line voltage in the drive body. have you had this inspected or not?

 

[daleuger]

the control wires in your picture look to be twisted shielded type wire, is that correct? if so it will mix with the line voltage in the drive body. have you had this inspected or not?

That's correct, but we ran the conduit and not the control wiring and weren't sure what type they were going to use, so better to be on the safe side. It's not been inspected yet. Still an ongoing job. But to answer the OP's question they are terminated together in the VFD w/o any kind of divider.

 

[johnj]

control wiring in VFDs

control wiring in VFDs

Check out 725.55D1

 

[stevenj76]

Just did such an install last week. The condulets between the VFD's lead to a junction box of control wires on the wall to the right. 480V fed in from the trough.

View attachment 3697

Where is the output of the drives?

About the seperation issue, I like to run raceways inside enclosures, and in one situation used a 600v heat shrink over the cables. The interference from the drive outputs can be severe as it is much higher than 60hz. I think as long as you avoid the output by always coming in on the left, you should have your clearance and be okay from interference.

 

[daleuger]

Where is the output of the drives?

About the seperation issue, I like to run raceways inside enclosures, and in one situation used a 600v heat shrink over the cables. The interference from the drive outputs can be severe as it is much higher than 60hz. I think as long as you avoid the output by always coming in on the left, you should have your clearance and be okay from interference.

Frequency? Voltage? Amperage? Please clarify.