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 c
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
Schne
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 feasi
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 fuse
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 be
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 an
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Monrad
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
Fax:+972-3-691
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]
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 de
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 manu
>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 Op
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
Hello Brian,
What surg
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
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
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 protection
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