Posted for: ivan_velasq...@hp.com
:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 (Voice) 619-505-1502 (Fax) Military & Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) > -----Original Message----- > From: VELASQUEZ,IVAN (HP-SantaClara,ex3) [SMTP:ivan_velasq...@hp.com] > Sent: Tuesday, November 09, 1999 11:57 AM > To: 'duncan.ho...@snellwilcox.com'; emc-p...@majordomo.ieee.org > Cc: PABON,GUS (HP-SantaClara,om4) > Subject: RE: Power hazard on modular equipment > > Duncan, > > I have seen power supplies with fuses at the secondary outputs which limit > the output power to 240 VA. If the power supply has a mechanical > enclosure > that limits user access, than the equipment can be user accessible as far > as > energy hazards goes. > > Ivan > > -----Original Message----- > From: duncan.ho...@snellwilcox.com [mailto:duncan.ho...@snellwilcox.com] > Sent: Tuesday, November 09, 1999 8:40 AM > To: emc-p...@majordomo.ieee.org > Subject: Power hazard on modular equipment > > > > Group, > Has anyone had any experience of problems with energy hazards on > modular > products and may be able to give some advice. The problem is that some of > our > equipment uses the compact PCI standard for interconnection. One of the > main > problems with the compact PCI standard is that it uses male connectors on > the > backplane card. This becomes a big problem when there is a bank of > redundant > power supplies capable of supplying over 240VA > > The product is modular and therefore a customer can hot-plug cards. When > all > cards are in place they have current limiting on board and there is no > access to > the backplane therefore there is no problem, however they are removable > without > a tool and because the system is modular you never know how many slots > will > be > used. > > EN60950 clearly states that 'there shall be no energy hazards in the user > accessable areas' and this is quite clearly the case so how do other > manufacturers of IT equipment with compact PCI busses and large power > supplies > get over this problem? Do other people screw their boxes shut, screw their > cards > in, designate the equipment for use only in a restricted access area, or > use > another method of protection from the hazard. I know the possible > solutions > but > I am looking for feedback as to how some other people have overcome this > and > what method they have used. > > Any information anyone can give me would be greatly appreciated. > Regards, > Duncan. > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
