First, you have done the right thing by showing the requirement in the
standard that supports your assertion. It's really difficult to argue
against that. Second, I suggest you ask the manufacturers of the
terminal block how they claim it meets the requirements of 60204-1. You
may find that it doesn't, but it does for some other standard, that
doesn't apply to your EUT.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-06-18 19:38, Steve Brody wrote:
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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