Hi Ken,Yes, this is is regarding safety, we are not seeing EMC issues on
previous design.This is something I didn't consider because of the door size
(~3ft x 7ft) and weight (about 30 lbs) and the depth these spring-loaded
captive “finger” have to be.
--
Thank you and best regards.
- Frank
On Thursday, June 16, 2022, 03:37:32 PM PDT, Ken Javor
<ken.ja...@emccompliance.com> wrote:
Re: [PSES] Removable door panel groundingI’m just curious why something like a
spring-loaded captive “finger” couldn’t be in contact with the door/plate when
installed. I’m assuming here the grounding is for safety, not EMI. In the
latter case, the gasket approach is necessary. Also, for safety I don’t see
the gas-tight spot as an issue: a little corrosion or “gunk” between plate and
finger would break down in the event of a line-potential fault to the
door/access panel.
Ken Javor
Phone: (256) 650-5261
From: John Cochran <jcoch...@strongarm.com>
Reply-To: John Cochran <jcoch...@strongarm.com>
Date: Thu, 16 Jun 2022 19:52:00 +0000
To: <EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] Removable door panel grounding
>From my knowledge, the access panel will need a ground conductor or metal to
>metal contact. The second is more tricky as there can be no electrical
>components on the panel and no possibility of a live conductor touch it.
I would find a way to keep the ground conductor connected but maybe consider
ground studs at opposite corners so it has little slack when closed but allows
the panel to be set aside without disconnecting the ground.
John Cochran
jcoch...@strongarm.com <mailto:jcoch...@strongarm.com>
215-443-3400 x219
From: Stultz, Mark <00000f79f2e10e47-dmarc-requ...@listserv.ieee.org>
Sent: Thursday, June 16, 2022 15:38
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Removable door panel grounding
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Hi Frank,
Can you do a longer ground that allows moving the cover to the side? In my
experience it is risky to design a system where the ground is routinely
disconnected. If you need to design it that way, I recommend using a braided
gasket that is partially compressed when the panel is installed. You’ll need
the panel and gasket plated so that there is no corrosion that would increase
the contact resistance since this arrangement can’t be considered gas-tight.
Best regards,
Mark Stultz | CMSE® | Sealed Air | Automated Packaging Systems | Streetsboro,
OH | 330-342-2402
From: Frank Tang <00000d3fa4ae712a-dmarc-requ...@listserv.ieee.org>
Sent: Thursday, 16 June, 2022 3:23 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Removable door panel grounding
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Hi All,
In the past we have typically done a stud and nut grounding for removable
lift-off access panels, but this is an inconvenience to disconnect the ground
cable.
What are other methods for grounding large panel doors (3ft x 7ft) if any?
--
Thank you and best regards.
- Frank
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