Hi Andrew
Providing the protective earth is the same on the two UPSs then there should be no issue. The purpose of an A and B supply to ensure security of supply and they have to be run off separate supplies. Best regards John www.cei.ie <http://www.cei.ie/> www.fms-corp.com [email protected] ***************************************************************** DISCLAIMER: The information contained in this e-mail may be confidential and is intended solely for the use of the named addressee. Access, copying or re-use of the e-mail or any information contained therein by any other person is not authorised. If you are not the intended recipient please notify us immediately by returning the e-mail to the originator _____ From: Andrew McCallum [mailto:[email protected]] Sent: 01 June 2012 15:03 To: [email protected] Subject: [PSES] Power Supplies Hi All We have a control system in a single 19 inch cabinet. The system is duplicated - two computers - one live (system A) and one in standby (system B). The customer wants to run each system off a separate UPS. I am concerned that this would mean having potentially dangerous voltages in the cabinets under fault conditions. Supply would be 110V AC to each system from different phases of the building 3 Phase supply. Regards Andrew McCallum _____ Confidentiality: This e-mail and its attachments are intended for the addressees only (or people authorised to receive them on their behalf) and may be confidential or privileged. If they have come to you in error you must take no action based on them, nor must you copy or show them to anyone; please delete them from your system and reply to this e mail highlighting the error. Security: Please note that this e-mail has been created in the knowledge that internet e-mail is not 100% secure. Anyone who communicates with us by e-mail is taken to accept this. Viruses: We have taken steps to ensure that this e-mail and attachments are virus free, but we advise that in keeping with good computing practice you should ensure that they are actually virus free. _____ DeltaRail Group Limited registered office Hudson House, 2 Hudson Way, Pride Park, Derby, DE24 8HS. Registered in England and Wales, number 5839985. Please refer to www.deltarail.com - ---------------------------------------------------------------- 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 <[email protected]> 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://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]> - ---------------------------------------------------------------- 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 <[email protected]> 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://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]>
