joulesarecool
Member
Existing switchboard has a 1200A busduct off the main switchboard rising up the floors of an office building. At the 6th floor, it transitions up to the top with 600A. Thanks!
joulesarecool said:Existing switchboard has a 1200A busduct off the main switchboard rising up the floors of an office building. At the 6th floor, it transitions up to the top with 600A. Thanks!
joulesarecool said:Existing switchboard has a 1200A busduct off the main switchboard rising up the floors of an office building. At the 6th floor, it transitions up to the top with 600A. Thanks!
petersonra said:How is this any different than any other tap?
bdarnell said:joulesarecool said:Existing switchboard has a 1200A busduct off the main switchboard rising up the floors of an office building. At the 6th floor, it transitions up to the top with 600A. Thanks!
petersonra said:How is this any different than any other tap?
It's different in that it's specifically addressed in Article 368. The requirement goes back as far as the '99 Code, at least that's the oldest one I have with me.
jim dungar said:Another 240.21(E) code reference is another location that says busway taps are special.
My guess is, it is because plug-in busways are not much different than very long panelboards. Would you allow a 600A MLO panelboard to be fed from a 1200A feeder?