Steve, You have received many good comments focusing especially on the
rational provision of earthing/grounding including under 60204-1.
It is not clear as to which specific argument will persuade the
customer however, perhaps you can get some movement to agreement by providing
the CE pedigree (VDE or whoever) along with specifics about the adequacy of
using the DIN rail earthing/grounding from an authoritative source which they
will accept. The DIN rail manufacturer should be helpful in supporting this
application.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Affairs Consultant
PO Box 1067
Albany, Ore 97321-0413
503/452-1201
IEEE Life Fellow
<mailto:[email protected]> [email protected]
Entropy ain’t what it used to be
From: Nyffenegger, Dave <[email protected]>
Sent: Tuesday, June 18, 2019 12:21 PM
To: [email protected]
Subject: Re: [PSES] Grounding
Steve, I don’t recall EN 60204-1 requiring a central earthing point,
disallowing daisy chaining of the protective bonding circuit. My copy is with
2009 amendments. Is there a newer version with this requirement? NFPA 79 2015
is harmonized with EN 60204-1 and I don’t think there is such a requirement in
there either.
The use of the screw-less DIN rail terminal blocks for protective bonding
connections should be fine if that is their intended purpose and they are NRTL
approved or (for outside NA) CE marked to a standard allowed by EN 60204-1.
-Dave
From: Steve Brody [mailto:[email protected]]
Sent: Tuesday, June 18, 2019 2:39 PM
To: [email protected] <mailto:[email protected]>
Subject: [PSES] Grounding
HI all,
I have a client with whom I am having a discussion about grounding for an EN
60204-1 product. The product consists of 3 sub-modules all of which use mains
power derived from the first module where the external mains comes into the
unit.
In the first module the ground from the branch circuit goes to a ground stud,
lockwasher and nut, and from there a ground wire goes from the stud to a DIN
rail mounted Wago terminal block designed for grounds, as it is green/yellow in
color, which is screwless and uses spring pressure to secure the wire in place.
Other internal grounds in this module also connect to this block.
The second module receives the main ground from the first module in a similar
arrangement, and the third module gets it's ground from the second module.
I have pointed out to my client that, in accordance with all safety standards I
am aware of, and a figure in EN 60204-1 on grounds, that modules 2 and 3 must
have ground leads that goes back to the point where the main ground comes into
the unit originally, and not daisy chained from module to module.
I don't think there is anyone who will disagree with this but I did say I would
ask the question. Second question is do you thin there is a problem is using a
screwless pressure connector for the grounds, as opposed to a
stud/lockwasher/nut?
Thoughts and comments would be appreciated by reply to his or privately at
[email protected]
<https://connect.xfinity.com/appsuite/[email protected]>
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