Hi Doug, I believe there is another option (which may or may not be palatable) - You can ask your NRTL to strap out (bypass) the fuse and conduct whatever tests they like & if there is no fire or shock danger they must ignore the fuse rating entirely. The down side of this is the cost & time of the additional testing.
Mike Harris/Teccom -----Original Message----- From: Doug <[email protected]> To: EMC-PSTC Discussion Group <[email protected]> List-Post: [email protected] Date: Thursday, October 19, 2000 10:50 AM Subject: Got a beef with an NRTL ... > >I'm just about ready to escalate this issue. > >Issue: Major NRTL has recognized a DC-DC power supply. > Said ps is being used within the confines of > it's stated purpose, input power, output power, > temps, etc ... > > Said product is submitted to NRTL for what appeared > to be a walk through. Oh no, Mr. McKean. You can't > use THAT power supply as intended. Input fuse of > power supply (that is the fuse INSIDE the power that > is out of our hands) is an AC fuse. It should be a > DC fuse. (From the documentation from the ps mfr, > the approval was done with the aC rated fuse.) > > You have to either: > > 1. have the ps mfr change the input fuse. > > or > > 2. drop an in-line fuse between the power inlet > of the product and the input of the ps. > >EXCUSE ME!?! > >How the heck can a power supply mfr get NRTL approval on one >hand and, yet, when that power supply is used within it's >intended and stated purpose, get rejected? > >Even bringing this to the attention of the test engineer >(who has approx over 10 years experience as a test eng) >it defaults to - "well, that's just because the OTHER >test engineer interpreted it that way ... " > >I can understand and have been in those areas of >"interpretation" with NRTLs, but this one really ... >er ... surprises me. > >Yours truly and totally confused, Doug > >------------------------------------------- >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] > > ------------------------------------------- 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]
