Hello Rich,

Thank you for your comment.

What you wrote is a good general approach however in this particular case phase 
conductors will be attached directly to terminal of the mains switch and PE 
conductor will be fixed to a stud terminal. So I cannot compare dimensions 
directly.

Do you maybe know why table is limited to 80A?

Best regards,
Bostjan

On 1. dec. 2016, at 19.37, Richard Nute <ri...@ieee.org<mailto:ri...@ieee.org>> 
wrote:


As a general rule, the PE hardware should be the same as the phase hardware.  
Since, under worst-case fault, the PE will carry the maximum phase current from 
the wall, construction should be the same as phase construction.

Bonding conductor (internal earthing conductor) hardware depends on fault 
current within the equipment, usually depending on the internal overcurrent 
protective device rating.

Rich



From: Scott Aldous [mailto:00000220f70c299a-dmarc-requ...@ieee.org]
Sent: Thursday, December 01, 2016 9:04 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto: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<mailto: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<mailto: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<mailto:ibm...@gmail.com>]
Sent: Thursday, December 1, 2016 5:24 AM
To: Boštjan Glavič <bostjan.gla...@siq.si<mailto:bostjan.gla...@siq.si>>
Cc: EMC-PSTC@LISTSERV.IEEE.ORG<mailto: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<mailto: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


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