wireways

[ArticFox]

Electrical mounting specifics needed

we are removing an old (1987)westinghouse VSD and replacing it with an A-B VSD, much smaller.

I want to mount some kind of wireway just above the floor where the conduits stup up thru the floor in the control room.

Mount the new boxes on the wall where the large ones were.

Looking for expert advice on the wireway and conduits to the new VSDPURGE

 

[HCBFlash]

OK, I'm wondering what you might mean by "expert advice". I think you'll want to have a 10"x10" piece of "wireway" a.k.a. "trough" or "auxiliary gutter" mounted on the wall, up a few inches off the floor (high enough for the conduits to be straight and connectors accessible for tightening). A 10x10 trough should be large enough for wire bending and room to splice if so desired.

Bring the feed (line) into the drive in it's own metallic conduit(s) (HWG, GRC, EMT, IMC, it should be ferrous material as opposed to Aluminum), and the load conductors in their own conduit(s). Leave adequate space around the VFD for cooling, and layout the wall space so that you could add a transformer or reactor later if you find you need one.

Be sure to use grounding bushings on all the conduits, and a bonding jumper to the wireway, would probably be good too, although good assembly practices and use of "star" washers with fasteners and coppercoat or penetrox to keep good ground continuity throughout all enclosures and raceways is really how the work needs to be executed.

A-B has literature with extensive directions pertaining to the installation and wiring of VFDs. Actually all VFD manufacturers have that kind of stuff, some better than ABs.

Hope this has been a little help.

Please let us all know how this works out for you! and don't forget faq731-376

 

[ArticFox]

It has been a long time since i have had to specify the details of installation in a scope of work. Now just getting all the parts and pieces specified for a bill of material.

thank you for the tips