It comes from the nice new one UL60950. First time I encountered it was a new product submitted for approval in January. One thing though it only applies if the power supply can be removed by the operator. If it is a service removable item, i.e. screwed in place, then the test was not required.
"Kealey, Doug" wrote: > > > Please let us know which UL standard contains this test. I'm sure > you've aroused everyone's curiosity. > Thanks, > Doug > > -----Original Message----- > From: [email protected] [mailto:[email protected]] > Sent: Thursday, June 21, 2001 4:38 AM > To: [email protected] > Subject: Re: Hot Swappable Power Supplies ? > > > > Another UL specific test to consider it the Connector Current > Interrupt Test. > Hot plug your device 200 times and recheck the dielectric strength and > earth > path. It is a new UL requirements and the test sheet currently does > not have a > number on it. Well not he one I had to fill in the other month. > > [email protected] wrote: > > > Dan, > > > > Without knowing any detail on your product, my vote is to say that > all of > > the requirements of 60950 that apply to any other power supply would > apply > > in full to a hot swappable supply. Assuming the supply you're > handling is > > akin to a bank of rectifiers in a shelf, the shelf would also need > space > > fillers to close off access to hazardous parts in the event that a > full > > complement of supplies is not used. I assume the over-all design > addresses > > in-rush currents at both the supply and shelf ends, labels, > warnings, > > instructions, etc....the full monty. > > > > My opinion and not that of my employer. > > Regards, > > Kaz Gawrzyjal > > [email protected] > > > > -----Original Message----- > > From: Richardson, William G [mailto:[email protected]] > > Sent: Wednesday, June 20, 2001 4:50 PM > > To: 'Dan Teninty' > > Cc: '[email protected]' > > Subject: RE: Hot Swappable Power Supplies ? > > > > There must be a bleeder resistor (across the X caps) to make the AC > input > > pins safe to touch once the supply is removed from the cabinet. > > > > If there are exposed voltage or energy hazards with the supply > removed, > > there must be a restriction such that only trained personnel are > instructed > > to do this OR a tool must be used to remove the supply. > > > > -----Original Message----- > > From: Dan Teninty [mailto:[email protected]] > > Sent: Wednesday, June 20, 2001 4:16 PM > > To: Emc-Pstc@Majordomo. Ieee. Org > > Subject: Hot Swappable Power Supplies ? > > > > Do any of my esteemed colleagues know of any specific requirements > in 60950 > > (UL/CSA or EN) relating specifically to hot swappable power > supplies? A > > search in the PDF version of UL/CSA 60950 reveals nothing specific > when > > searching for "hot", "swap", or "power supply". A visual search of > the TOC > > also reveals nothing specific. > > > > 2.6.5.4 deals with : > > > > Parts that can be removed by an operator > > Protective earthing connections shall make earlier and break later > than the > > supply connections > > in each of the following: > > - the connector of a part that can be removed by an OPERATOR; > > - a plug on a power supply cord; > > - an appliance coupler. > > Compliance is checked by inspection. > > > > This is the most I could find that was related, and then it is > referring to > > the AC side. > > > > Thought I would triple check with the collective brain trust to be > sure. > > > > Appreciate any pointers to passages that I missed. > > > > Thanks, > > > > Daniel E. Teninty, P.E. > > Managing Partner > > DTEC Associates LLC > > Streamlining the Compliance Process > > 5406 S. 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