> From: scott barrows > Sent: Monday, May 07, 2007 12:03 PM > > Hi all, > > With dual power cords think: > 1. Single fault scenario and how much current will then go > through each cord or a single cord if there is a failure of > some sort. This is a design thing, easier with two power > supplies then splitting the input.
I echo Scott's sentiment. If it's an allowable construction, the power supply cords need to be sized to handle full current (min. No. 12 AWG), in the event of a fault. > 2. Limits to the current on the branch circuit. This can be > overcome by stipulating that the power cords have to go to > different circuits (and mean it) The problem with this is that it's not always simple to know that a nearby outlet is on another circuit, unless it's professional equipment. Even so, if the second circuit on another phase and there's no independent rectification for that circuit, it may cause problems inside the product. This last issue could be reason enough to consider disallowing safety certification of other than professional equipment. Regards, Peter L. Tarver, PE [email protected] CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform Electronic Transactions Act or the applicability of any other law of similar substance and effect, absent an express statement to the contrary hereinabove, this e-mail message its contents, and any attachments hereto are not intended to represent an offer or acceptance to enter into a contract and are not otherwise intended to bind the sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any other person or entity. _____________________________________________________________________________ Scanned by Sanmina-SCI eShield _______ _____________________________________________________________________ - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
