Grounding metal rails?

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flx
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Grounding metal rails?

Post by flx » Mon Mar 16, 2020 11:58 am

It looks like I’ll be building myself a 5U enclosure soon, which would have to house various module formats. This means that I won’t be able to use pre-drilled metal rails to screw the modules to. I thought about using hard wood and simple wood screws to attach the modules freely next to each other, but I’m wondering if the module front panels need to be grounded, as I’ve seen 5U cases which have grounded, pre-drilled metal rails. Is this recommend or even required generally?
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snevlida14
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Re: Grounding metal rails?

Post by snevlida14 » Mon Mar 16, 2020 12:58 pm

5u Modules don’t need to be grounded to rail. Tons of 5u guys have wood rails.

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StillNotWorking
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Re: Grounding metal rails?

Post by StillNotWorking » Mon Mar 16, 2020 1:16 pm

Rails are not designed to be electrically conductive. Surface treatment of rails and faceplate most often isolate them.
Still for good messure I like to ground mine :tu:
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luchog
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Re: Grounding metal rails?

Post by luchog » Mon Mar 16, 2020 1:17 pm

If you are worried about grounding to rail, and have to use wood, there's always the option to lay down strips of copper tape between the wood and module panels.

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flx
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Re: Grounding metal rails?

Post by flx » Mon Mar 16, 2020 2:27 pm

Thanks everyone! :tu:
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KSS
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Re: Grounding metal rails?

Post by KSS » Tue Mar 17, 2020 7:42 pm

flx wrote:
Mon Mar 16, 2020 11:58 am
but I’m wondering if the module front panels need to be grounded, as I’ve seen 5U cases which have grounded, pre-drilled metal rails. Is this recommend or even required generally?
Any metal parts which can be touched by an operator need to have a direct path to the mains GND. If you have wooden rails, the panels still need to be grounded. Usually this is taken through the sleeve of the jacks having a physical connection to the panel and an electrical connection to the module and from there to the PSU. Angled tooth washers are used to be sure the jack sleeve 'bites' through any non-conductive oxide or anodized layer.

edit: Once this safety GND is established, you might not want all other jacks to be connected to the panel electrically. Plastic jack body threads, plastic nuts and plastic step washers are used to insulate some jacks from the panel. /edit

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bphenix
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Re: Grounding metal rails?

Post by bphenix » Wed Mar 18, 2020 12:09 pm

some older 5u modules required the front plate to be grounded. for example, early versions of Modcan, though they away from that fairly quickly. i don't think anyone builds or sells front plate grounded modules anymore.

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Re: Grounding metal rails?

Post by KSS » Wed Mar 18, 2020 12:57 pm

bphenix wrote:
Wed Mar 18, 2020 12:09 pm
some older 5u modules required the front plate to be grounded. for example, early versions of Modcan, though they away from that fairly quickly. i don't think anyone builds or sells front plate grounded modules anymore.
I believe -and hope- you're wrong. Every one that isn't is a safety violation.

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bphenix
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Re: Grounding metal rails?

Post by bphenix » Wed Mar 18, 2020 1:56 pm

oh i was wrong. what i meant is that modcan b used to not ground their jacks which could cause issues. they now ground those.

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