I agree with Brian. I've been involved with product safety over 20 yrs and 
worked for an NRTL for about 6 of those.

The 40 A requirement came from the Canadian electrical code and all the NRTLs.

The only exemptions I've seen to the 100 % ground bond requirement has been for 
Class II and Class III devices or devices using an external power supply (brick 
or wall-wart styles.)

Josh

From: Brian Kunde <bkundew...@gmail.com>
Sent: Wednesday, May 12, 2021 8:42 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Ground Bond Tests

EXTERNAL SENDER: Verify links, attachments and sender before taking action


61010-1 § 4.1 says,  "Tests in this standard are TYPE TESTS to be carried out 
on samples of equipment or parts. Their only purpose is to check that the 
design and construction ensure conformity with this standard. In addition, 
manufacturers shall perform the ROUTINE TESTS of Annex F on 100 % of equipment 
produced which has both HAZARDOUS LIVE parts and ACCESSIBLE conductive parts."

61010-1 Annex F, § F2 calls out the "Protective earth" test, also known as the 
Ground Bond Test, as a required test to be performed on 100% of production.  
Note the "NOTE" that says, "No value is specified for the test current.".   So 
some NRTL inspectors allow the ground bond test in production to be performed 
at any reasonable current value, but most will follow the requirements of 6.5.2.


I have been doing Product Safety for over 30 years and have worked with UL, 
CSA, TUV, NEMKO, EOLAS, etc., and all of them require 100% testing of 
production units to both the Highpot test and the Ground Bond test.

Regarding the 100mΩ verses 200mΩ question, all the NRTL inspectors I have 
worked with require the measured impedance of the Power Cord to be no more than 
100mΩ.  Note the UL/ANSI/CSA Deviation to 6.5.2.4 that instead of the 100mΩ 
requirement has a "shall not cause a potential drop of more than 4 V".  At a 
minimum 40 A ground bond test, a 100mΩ impedance would give you a 4V drop.  It 
doesn't say anything about an 8V drop for non-detachable power cords.  So NRTLs 
are going to stick with the 100mΩ across the board, I believe (this is opinion).

Hope this information is helpful.

The Other Brian


On Tue, May 11, 2021 at 11:27 PM Steve Brody 
<sgbr...@comcast.net<mailto:sgbr...@comcast.net>> wrote:
So here is my question, or actually two of them:

First, one of my clients has been told by their 3rd party NRTL that a ground 
bond test is required as part of factory/production routine tests, even though 
it is not required by 61010-1.  I have never run into this requirement in my 
work history and I would be interested in hearing if any of you have.

Second, just to be sure my interpretation is correct, 61010-1, section 6.5.2.4, 
Impedance of protective bonding of plug-connected equipment, in the fist 
sentence, it has a limit of 100 mOhms impedance and my read is that this is for 
equipment with a power cord that has a plug on one end and a receptacle on the 
other.

Then, in the same section, still under the title of plug-connected equipment, 
it says for equipment that has a non-detachable power cord  the limit is 200 
mOhms.  My interpretation is that plug-connected equipment with a 
non-detachable power cord is when the power cord is hard wired to the unit 
under test, but still has a plug for mains connection.

Thoughts?

Thanks in advance and you can reply here or privately to 
stev...@productehsconsulting.com<mailto:stev...@productehsconsulting.com>


Steve Brody
sgbr...@comcast.net<mailto:sgbr...@comcast.net>
C - 603 617 9116
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