Wiring method to 2000A transfer switch, 10 feet outside

electrofelon

electrofelon

Senior Member
Location
Cherry Valley NY, Seattle, WA
Occupation
Electrician
I have to come out of a 2000A switchboard, theu a CMU wall to a 2000A transfer switch outside. There is about 10-12 feet between the wall and the transfer switch. There is already a large box mounted on top of the switch board. The equipment is oversized, with 3 years of demand data showing max demand of 136KW. (377A). Thus i will probably reduce the feeder down to maybe 1200A. I can probably get 2 sets of 600Al in a 4" with a reduced neutral, in which case that would be 4 conduits total (2 out, 2 back in). We're just toying with other options. What about using a 3r wire way? I can just cut a hole in the CMU wall, use a wire way and box flange to come into the back of the inside box, then nipple put the bottom into the top of xfer switch. Another option might be cable tray, but that doesn't seem like a great option due to transitioning from inside to outside and having to go into the top of the switch. Any other thoughts or ideas? Should I just run the conduits?
 
pipe_bender said:
I have always thought busway was cool, there is a hotel here that has a service with an ATS thats all in busway.
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That would certainly be nice. My initial thought is that would not be real cost effective due to the small size of this, and I would have to transition back to conductors at each end which seems to imply that perhaps a wire way is just simpler.
 
pipe_bender said:
I have always thought busway was cool, there is a hotel here that has a service with an ATS thats all in busway.
Click to expand...
I did a lot of work for a large manufacturing company that removed all of their outside busway from their US plants because of failures, overtime, related to water ingress, even though the busway was rated for wet locations. The plant I worked at replaced it with cable bus, not sure what the other plants did.
 
Strathead said:
Just don't forget that pesky 314.28 rule applies to the wireways. Ridiculously so, IMO.
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Can I just ignore that? :unsure:. Yes that would be problem as on one side I would need to come out the bottom of the wireway, and was thinking something like a 12"X12". There is a large box available (project was started by someone else) that can go on top of the transfer switch so I could use a box flange on both ends so it would just be straight in and out.
 
I'd love to have about 300 feet of bussway for my shop. I'll have to put that on my list for Santa along with the 250KVA 480 volt padmount
 
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