Thanks for the information Horst. Regards,
Mark Gill, P.E. EMC/Safety/NEBS Design Nortel Networks - RTP, NC, USA > -----Original Message----- > From: [email protected] [SMTP:[email protected]] > Sent: Friday, June 02, 2000 1:53 AM > To: Gill, Mark [NCRTP:0S33:EXCH] > Subject: Re: Looking for Inrush Current Standard > > Mark, > > the IEC61204 defines inrush current limits. Also you might refer to > NAMUR (a standard of the chemical industry in Europe). This standard > defines peak inrush current less 15 times the input current. > > With best regards > Horst > > > Mark Gill wrote: > > > > Don - > > > > I have not heard of such a standard. Somewhat obvious, but general > > product safety requirements state that the inrush current must be > > limited such that overcurrent protection devices (either supplemental > > or branch circuit) are not opened in the course of normal operation of > > the product. This would be the upper limit for inrush, and depends > > upon the characteristics of the particular protector. Normally this > > is an end-product requirement, as compliance is affected by all > > passives and the particular supplemental protection (if any) in front > > of the supply in the final product. Unusually large decoupling > > capacitors (bulk) can sometimes require special circuits to limit the > > size of the inrush current. > > > > I am a bit unsure about the limits you mention below, specifically for > > t>500 ms, as normal operation of all products falls within this range > > and can well exceed this limit (infinite time implies steady state)! > > I hope this helps. > > > > Regards, > > > > Mark Gill, P.E. > > EMC/Safety/NEBS Design > > Nortel Networks - RTP, NC, USA > > > > -----Original Message----- > > From: [email protected] [SMTP:[email protected]] > > Sent: Thursday, June 01, 2000 9:03 AM > > To: [email protected] > > Subject: Looking for Inrush Current Standard > > > > I am looking for a standard or standards (IEC, EN or similar) > > which contain > > inrush current requirements for power supplies. > > The standard might require the inrush to be: <20A for 50 > > us<t<1.5ms, <10A for > > 1.5ms<t<500ms, 0.6A for t>500ms. > > > > Do any good standards exist on inrush current? > > > > Thanks, > > Don MacArthur > > > > ------------------------------------------- > > This message is from the IEEE EMC Society Product Safety > > Technical Committee emc-pstc discussion list. > > > > To cancel your subscription, send mail to: > > [email protected] > > with the single line: > > unsubscribe emc-pstc > > > > For help, send mail to the list administrators: > > Jim Bacher: [email protected] > > Michael Garretson: [email protected] > > > > For policy questions, send mail to: > > Richard Nute: [email protected]
