Re: [PSES] Old editions of IEC 65

fifth edition, 1976 (original) has been spoken for. Priority: normal Date sent: Mon, 21 Aug 2017 06:31:55 -0700 Send reply to: ptar...@ieee.org > Hello, everyone. > > I'm going through old papers and discarding items I'm no > longer interested in keeping. I

Re: [PSES] Surge Suppression - Dos, and Don'ts

Hi Brian, An open-circuit of 15kV pk and short-circuit peak of 7500A, tells me an internal impedance of 2 ohms. If I recall correctly, 61000-4-5 specifies source impedance, depending on L-L or L-G coupling (2 ohms or 12 ohms) Ralph McDiarmid Product Compliance Engineering Solar Business

Re: [PSES] Surge Suppression - Dos, and Don'ts

Brian C I faced the very issue that you raised in your last para below at a company (best not to name!) for which I worked after I "inherited" a situation where unprotected GDTs had been designed in to correct an EMC-specific surge test failure, and further design changes were not really

Re: [PSES] Surge Suppression - Dos, and Don'ts

Hello All, We have a base design that passed testing (exhibiting no damage) using a 1.2u/50uS open-circuit of 15kV, and an 8/20uS current peak of 7.5kA, as per IEC61000-4-5. (This product did not include the extra design features that I proposed earlier, only basic surge suppression, and a

Re: [PSES] Surge Suppression - Dos, and Don'ts

Hi Brian: If your charger is powered from 120/240 volts domestic service, the maximum transient over-voltage is about 6 kV due to the clearances in the service entrance. Domestic equipment will never see 15 kV. Likewise, for industrial service, the maximum transient over-voltage will

Re: [PSES] Surge Suppression - Dos, and Don'ts

Hi Brian: I've been following this thread and have some comments/questions: 1) I work mostly with telecom lightning protection, but I'm pretty sure you are correct that for AC mains protection, there are some international standards that prohibit simply placing an MOV line-to-ground

Re: [PSES] EU Blue Guide

Downloads fine in Firefox ESR [52.3.0 (32 bit)] and Microsoft Internet Explorer 11 … both open the separate Adobe Acrobat Pro XI application.    Also downloads fine in Google Chrome [version 60.0.3112.101 (64 bit)] which opens the file within a new tab within the Chrome browser.   Monrad  

Re: [PSES] Surge Suppression - Dos, and Don'ts

Hi Brian, Details about Surge suppressors you can find in the IEC 61644-1 and UL 1449 standards. Best Regards, Steli Steli Loznen, M.Sc., SM-IEEE Member of BoD IEEE-PSES Convener IEC 62A/MT 62354 17-3 Shaul HaMelech Blvd. Tel Aviv 6436719 Israel Tel:+972-3-6912668

Re: [PSES] Surge Suppression - Dos, and Don'ts

I second that. The NRTLs and the standards are typically interested in safety, not product quality/reliability. Reliability is up to the designer. -Dave From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: Tuesday, August 22, 2017 1:31 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES]

Re: [PSES] Surge Suppression - Dos, and Don'ts

The point surely is that if the surge protection fails, and that is not detected and repaired, the next storm may destroy the equipment. As I said, I don't think this is a standards matter, it's a design matter. It is absolutely essential to distinguish between designing to meet a standard and

Re: [PSES] Surge Suppression - Dos, and Don'ts

I've not had any NRTL be concerned with protection of the surge protector. The surge protector is typically protecting against product failure not fire or operator injury. The NRTL is not concerned with surge protector failure as long as it doesn't result in a hazardous condition. If the

Re: [PSES] Surge Suppression - Dos, and Don'ts

>From what impedance? I know that these are successive questions, but without information about the source, nothing can be reliably designed. Standards in the IEC 62561 series might help with information. With best wishes John Woodgate 3 Bramfield Road East, RAYLEIGH Essex SS6 8RG UK OOO - Own

Re: [PSES] Surge Suppression - Dos, and Don'ts

We have been requested to pass 15kV on the mains input. Best Regards, Brian C. From: James Pawson (U3C) [mailto:ja...@unit3compliance.co.uk] Sent: August-22-17 9:36 AM To: Brian Ceresney ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] Surge Suppression - Dos, and Don'ts

Re: [PSES] Surge Suppression - Dos, and Don'ts

Standards are not intended to give design information, although sometimes it may be deduced from the provisions. TVS are less likely to fail catastrophically than varistors. I think you have to seek papers and textbooks about the design of protection against lightning. Since you are committed to

Re: [PSES] Surge Suppression - Dos, and Don'ts

Hello Brian, What surge voltages are you testing to? Presumably just on the mains input? Thanks James From: Brian Ceresney [mailto:bceres...@delta-q.com] Sent: 22 August 2017 17:31 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Surge Suppression - Dos, and Don'ts Dear

Re: [PSES] Surge Suppression - Dos, and Don'ts

Dear Regulatory Experts, We have recently had a request from a customer to modify an industrial battery charger(48V, 1000W output) to meet extremely high surge limits, ostensibly to help survive lightning strikes. In designing this version of the product, we have added varistor surge