First-time post with an application question after getting guidance from many of you earlier this year about how/where to learn more about safety. So here goes.....I would appreciate recommendations for either reference materials I should read or hardware options to convert a 208V/30A/3PH branch circuit to support qty. 6 of 208V/15A/1PH loads while trying to minimize the hardware volume.
Loads do not have internal supplementary protection devices, so I cannot rely on the 30A branch circuit protection w/simple disconnect switch for service support, similar to my home 240V air conditioning compressor circuit. I've searched the PSES archives with a variety of terms (208V, 3 phase, load center, molded case breaker, DIN rail, NEMA, etc.) and have been looking at online (well-known load center/circuit breaker suppliers, electrical supply companies, Mike Holt forums, etc.) and just started calling/visiting local electrical supply companies and big box home improvement stores. Haven't landed on a clear option yet. 3PH load centers all appear rated for 100A or larger capacity requiring larger AWG supply conductors than what I am told the branch circuit will have (10AWG or possibly 8AWG depending on final building construction plans). Descriptions of DIN Rail circuit breakers/supplementary protection devices sounded promising for the smaller form factors, but I haven't found a source that puts all of the hardware pieces together (supplementary protection devices, DIN rails, housing, etc.) into a system that meets NEC requirements -- this doesn't look like a common configuration. I also looked at suppliers of rack mount PDU gear and found one option that is about the size of a 12 circuit load center, but doesn't have a NEMA 3R requirement (surprise..) and would require a larger housing. The 208V PDU's that I have seen and in a couple of cases, peeked inside, have double-pole breakers with C19 outlets rated for 12A continuous load. Are there other options worth investigating or aspects of the power distribution design that I likely am not understanding? Kind regards, Adam - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
