LFNC Required?

[iMark]

I have a 500amp refrigeration rack piped in with PVC with back to back 90's between the strut rack on the building and the unit. The refrigeration unit is about 5 feet away from the building, the inspector thinks all the conduits with 120v or more should have flexible conduit between the building and unit. I can't find where LFNC is required to be installed. Can anyone help?

 

[Dennis Alwon]

If the unit requires flexibility then it would be required. I am not familiar with this unit but it sounds like an authority having jurisdiction call.

 

[iMark]

Thanks. It doesn't really vibrate as all the refrigeration lines are hard piped. I don't see any code that requires this?

 

[Dennis Alwon]

Thanks. It doesn't really vibrate as all the refrigeration lines are hard piped. I don't see any code that requires this?

I would agree

 

[iwire]

Thanks. It doesn't really vibrate as all the refrigeration lines are hard piped. I don't see any code that requires this?

We hard pipe them often, I would also point out the hard copper lines running to it.

If the unit requires flexibility then it would be required.

Strange as it sounds there is nothing in the NEC that says that. :slaphead:

 

[peter d]

We hard pipe them often, I would also point out the hard copper lines running to it.

Yes, the hard power and control cabinet for a refrigeration rack has no need for a flexible connection.

 

[GoldDigger]

Yes, the hard power and control cabinet for a refrigeration rack has no need for a flexible connection.

Unless you are worried about noise and vibration. Which is not likely to be a real problem.

 

[iwire]

Unless you are worried about noise and vibration. Which is not likely to be a real problem.

They are all so loud to start with it makes little difference.

Here is a small typical rack, notice it has a firm metal frame that sits directly on the floor.

The indvidule compressors will be on vibration mounts.

 

[iMark]

Thank you all.