Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.

2012-05-10 Thread Doug Powell
The routine voltage test on mains is mandatory, but the method has options. This is how I read the standard. -- Thanks, -doug Douglas E Powell doug...@gmail.com http://www.linkedin.com/in/dougp01 On Thu, May 10, 2012 at 2:04 PM, John Woodgate wrote: > In message > <**64D32EE8B9CBDD44963AC

Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.

2012-05-10 Thread Doug Powell
Yes, but in this case, disconnection is not an option. Thanks, -doug Douglas E Powell doug...@gmail.com http://www.linkedin.com/in/dougp01 On Thu, May 10, 2012 at 1:52 PM, Kunde, Brian wrote: > F.3.2 says, “…test of F.3.1 *can* be carried out…..”. Because it says > “can” and not “shall” doe

Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.

2012-05-10 Thread John Woodgate
In message <64D32EE8B9CBDD44963ACB076A5F6ABB0261DE06@Mailbox-Tech.lecotech.local>, dated Thu, 10 May 2012, "Kunde, Brian" writes: F.3.2 says, "...test of F.3.1 can be carried out.". Because it says "can" and not "shall" does this make this test optional? It seems, from the limited conte

Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.

2012-05-10 Thread Kunde, Brian
F.3.2 says, "...test of F.3.1 can be carried out.". Because it says "can" and not "shall" does this make this test optional? Doesn't the previous version of this standard allow you to disconnect surge suppressors during the HiPot test? The Other Brian From: emc-p...@ieee.org [mailto:emc-p.

Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.

2012-05-10 Thread Mick Maytum
Doug, I wouldn't credit the TC 66 has having MOV component knowledge, just perceptions. Since my last message I have sent messages to the Chair and Secretary of TC 66 wearing my IEC SC 37B chair hat. I was restrained for a change, merely stating they were breaking the laws of phys

Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.

2012-05-10 Thread John Woodgate
In message , dated Thu, 10 May 2012, Doug Powell writes: I would put a graphical clip of the curves in this email with areas of concern highlighted except I remember this is prohibited on the listserv. You could put them on a web site and tell us where. -- OOO - Own Opinions Only. Try www.

Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.

2012-05-10 Thread Doug Powell
Mick, Sorry I didn't review this email before I just sent my last. Clearly you see the same problem as I. I have to wonder if the committee in reviewing this clause only used data sheets and did not validate in the lab. Or is it possibly the committee members just missed this? I would like to

Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.

2012-05-10 Thread Doug Powell
Ah, This is the problem, if you look at Current/Voltage curves of the MOV device, 0.9 of the Vc for the 8/20 uS point still has a significant amount of current passing through the device to earth. Too much for a hipot running 50/60 Hz or DC. It is an impossible test. I would put a graphical cl

Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.

2012-05-10 Thread Mick Maytum
Doug, My previous message gave the IEC rulings - terms clamping voltage and nominal varistor voltage - for two specific points on the MOV clamping (clipping) characteristic. For completeness IEC 61010-1, ed. 3.0 (2010-06) defines the following: *working voltage * highest r.m.s. value o