I too can vouch for doing the Bonding test to a few hundred amps using a
Sorensen DC supply (and calibrated V and I meters and stopwatch...)

-Ken

On Thu, Dec 1, 2016 at 5:07 PM, Scott Aldous <
00000220f70c299a-dmarc-requ...@ieee.org> wrote:

> I've done this test at several hundred amps before (not to 60950-1, but
> similar). I used an old Sorensen
> <http://www.programmablepower.com/brands/sorensen.htm> DC power supply
> (low voltage, high current), with external calibrated measurement for both
> current and voltage drop. Care must also be taken in connecting the power
> supply to the EUT to make sure it is low resistance.
>
> On Thu, Dec 1, 2016 at 1:52 PM, John Woodgate <jmw1...@btinternet.com>
> wrote:
>
>> Reminds me of an amusing argument between a student and a 5 V 1000 A MG
>> set, observed from a safe distance.
>>
>>
>>
>> With best wishes DESIGN IT IN! OOO – Own Opinions Only
>>
>> www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England
>>
>>
>>
>> Sylvae in aeternum manent.
>>
>>
>>
>> *From:* Ted Eckert [mailto:000007cf6ebeab9d-dmarc-requ...@ieee.org]
>> *Sent:* Thursday, December 1, 2016 7:11 PM
>>
>> *To:* EMC-PSTC@LISTSERV.IEEE.ORG
>> *Subject:* Re: [PSES] dimension of the stud for PE
>>
>>
>>
>> The test of 2.6.3.4 does get interesting for high current equipment. I
>> have personally run this test only on equipment rated up to 50 A. Even
>> then, it required applying a 100 A test current for 4 minutes. For the 130
>> A rated product, you would have a test current of 260 A applied for 8
>> minutes.
>>
>>
>>
>> It may not be easy to find a ground bond tester capable of supplying this
>> current. I did my testing at 100 A using a transformer salvaged from a
>> large scrap uninterruptible power supply. It allowed me to step down a 15
>> A, 120 V circuit to provide the necessary current at a voltage below the 12
>> V limit. With this transformer, only a calibrated volt-meter and
>> current-meter were required.
>>
>>
>>
>> One significant issue with this test setup is that additional care must
>> be taken to ensure operator safety. Purchased equipment often has sensors
>> to detect a faulty connection or other error that triggers the equipment to
>> shut off power quickly. You likely won’t have this in equipment you build
>> yourself for such testing. Proper PPE and safety precautions should be used
>> when using any high-power equipment, but it may be necessary to talk with
>> your facility safety staff as home-built equipment doesn’t come with a user
>> manual telling you what is required for safety.
>>
>>
>>
>> The lower voltage used should provide some safety benefit. However, a
>> loose connection that comes in contact with an earth-grounded circuit may
>> result in significant arcing. Even low voltages should be treated with
>> respect when you have high current available.
>>
>>
>>
>> Ted Eckert
>>
>> Microsoft Corporation
>>
>>
>>
>> The opinions expressed are my own and do not necessarily reflect those of
>> my employer.
>>
>>
>>
>> *From:* Scott Aldous [mailto:00000220f70c299a-dmarc-requ...@ieee.org
>> <00000220f70c299a-dmarc-requ...@ieee.org>]
>> *Sent:* Thursday, December 1, 2016 9:04 AM
>> *To:* EMC-PSTC@LISTSERV.IEEE.ORG
>> *Subject:* Re: [PSES] dimension of the stud for PE
>>
>>
>>
>> Ken alluded to this before - alternately, 2.6.4.2 allows you to run the
>> test of 2.6.3.4 for constructions that don't meet the requirements of Table
>> 3E.
>>
>>
>>
>> On Wed, Nov 30, 2016 at 8:42 PM, IBM Ken <ibm...@gmail.com> wrote:
>>
>> Bostjan;
>>
>>
>>
>> That is my understanding; use the table to determine the cross-sectional
>> area (as wire) required, and then ensure that the stud&nut
>> arrangement provides at least triple that contact area.
>>
>>
>>
>> -Ken
>>
>>
>>
>> On Wed, Nov 30, 2016 at 11:33 PM, Boštjan Glavič <bostjan.gla...@siq.si>
>> wrote:
>>
>> Hi Ken,
>>
>>
>>
>> Thanks.
>>
>> So on short, if table 3B brings requirement of 50mm2 conductor, you would
>> accept terminal if it brings contact area of 150mm2?
>>
>>
>>
>> Best regards,
>>
>> Bostjan
>>
>>
>>
>>
>>
>>
>>
>> *From:* IBM Ken [mailto:ibm...@gmail.com]
>> *Sent:* Thursday, December 1, 2016 5:24 AM
>> *To:* Boštjan Glavič <bostjan.gla...@siq.si>
>> *Cc:* EMC-PSTC@LISTSERV.IEEE.ORG
>> *Subject:* Re: [PSES] dimension of the stud for PE
>>
>>
>>
>> Hi Bostjan!
>>
>> Can note (c) in Table 3E be applied to this product?
>>
>>
>>
>> I think it is justifiable to extend the protective bonding rules to the
>> PE connection; i.e. to pass the bonding test or to verify via inspection
>> that the PE conductor is "not smaller" than the mains supply - but
>> that's just my opinion.
>>
>>
>>
>> -Ken
>>
>>
>>
>> On Wed, Nov 30, 2016 at 10:53 PM, Boštjan Glavič <bostjan.gla...@siq.si>
>> wrote:
>>
>> Dear experts
>>
>>
>>
>> I hope there are some experts dealing with IEC 60950-1 standard. We have
>> a product that has rated input current 130A. Unit is intended for permanent
>> connection to mains and provide special terminals for 3 phases and bolt
>> with stud for PE connectio.
>>
>>
>>
>> Question is how should we evaluate dimension of this PE stud according to
>> clause 2.6.4.2, 3.3.5 and table 3E of IEC 60950-1 since values in the table
>> go only up to 80A rated current.
>>
>>
>>
>> Thank you for your support.
>>
>>
>>
>> Best regards,
>>
>> Bostjan
>>
>>
>>
>>
>>
>> -
>> ----------------------------------------------------------------
>>
>> This message is from the IEEE Product Safety Engineering Society emc-pstc
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>> -
>> ----------------------------------------------------------------
>>
>> This message is from the IEEE Product Safety Engineering Society emc-pstc
>> discussion list. To post a message to the list, send your e-mail to &LT;
>> emc-p...@ieee.org&GT;
>>
>> All emc-pstc postings are archived and searchable on the web at:
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>>
>> Attachments are not permitted but the IEEE PSES Online Communities site
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>> well-used formats), large files, etc.
>>
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>>
>>
>>
>> --
>>
>> Scott Aldous | Regulatory Compliance Program Manager |
>> scottald...@google.com | 650-253-1994 <(650)%20253-1994>
>>
>>
>>
>> -
>> ----------------------------------------------------------------
>>
>> This message is from the IEEE Product Safety Engineering Society emc-pstc
>> discussion list. To post a message to the list, send your e-mail to <
>> emc-p...@ieee.org>
>>
>> All emc-pstc postings are archived and searchable on the web at:
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>>
>> Attachments are not permitted but the IEEE PSES Online Communities site
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>> well-used formats), large files, etc.
>>
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>> -
>> ----------------------------------------------------------------
>>
>> This message is from the IEEE Product Safety Engineering Society emc-pstc
>> discussion list. To post a message to the list, send your e-mail to <
>> emc-p...@ieee.org>
>>
>> All emc-pstc postings are archived and searchable on the web at:
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>>
>> Attachments are not permitted but the IEEE PSES Online Communities site
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>> well-used formats), large files, etc.
>>
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>> ----------------------------------------------------------------
>>
>> This message is from the IEEE Product Safety Engineering Society emc-pstc
>> discussion list. To post a message to the list, send your e-mail to &LT;
>> emc-p...@ieee.org&GT;
>>
>> All emc-pstc postings are archived and searchable on the web at:
>> http://www.ieee-pses.org/emc-pstc.html
>>
>> Attachments are not permitted but the IEEE PSES Online Communities site
>> at http://product-compliance.oc.ieee.org/ can be used for graphics (in
>> well-used formats), large files, etc.
>>
>> Website: http://www.ieee-pses.org/
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>
>
>
> --
> Scott Aldous | Regulatory Compliance Program Manager | scottaldous@google.
> com | 650-253-1994 <(650)%20253-1994>
>
> -
> ----------------------------------------------------------------
>
> This message is from the IEEE Product Safety Engineering Society emc-pstc
> discussion list. To post a message to the list, send your e-mail to &LT;
> emc-p...@ieee.org&GT;
>
> All emc-pstc postings are archived and searchable on the web at:
> http://www.ieee-pses.org/emc-pstc.html
>
> Attachments are not permitted but the IEEE PSES Online Communities site at
> http://product-compliance.oc.ieee.org/ can be used for graphics (in
> well-used formats), large files, etc.
>
> Website: http://www.ieee-pses.org/
> Instructions: http://www.ieee-pses.org/list.html (including how to
> unsubscribe) <http://www.ieee-pses.org/list.html>
> List rules: http://www.ieee-pses.org/listrules.html
>
> For help, send mail to the list administrators:
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> Mike Cantwell &LT;mcantw...@ieee.org&GT;
>
> For policy questions, send mail to:
> Jim Bacher &LT;j.bac...@ieee.org&GT;
> David Heald &LT;dhe...@gmail.com&GT;
>

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