Hi to all,
I'm desigining a PCB with an Eurocard size that will be used in a subrack.
The board is connected to a mother board internal to the subrack and have some connector on the frontal side.
On the frontal side, the boards are covered by a metal front panel (chassis) that will be connected to earth.
In order to respect some safety standard I have to ensure 1500Vac of isolation between chassis and every signal provided by each frontal connector (also ethernet).
In my case I have a Single Board Computer that shows its ethernet connector on the front panel, and as you know, every computer realizes an electrical connection between its GND and chassis (metal enclosure of ethernet connector in my case).
Moreover I need to isolate some signals coming out from a DB37 connector as shown in the picture. The DB connector realizes an electrical connection between itself and chassis.
So I think I have the following problems.
1) due to electrical connection between gnd signal of Single Board Computer and chassis, I cannot ensure the 1500Vac isolation at ethernet connector.
2) My "gnd signal" is connected the "gnd field" via chassis and this defeats the electrical insulation between "gnd signal" and "gnd field".
Any suggestions?
Finally, to ensure the 1500Vac isolation I cannot connect the chassis to any gnd signal on board. I will connect chassis to an equipotential bar in the cabinet and this could keep me safe from any noise. Is it correct?
Thank you for your precious support.
I'm desigining a PCB with an Eurocard size that will be used in a subrack.
The board is connected to a mother board internal to the subrack and have some connector on the frontal side.
On the frontal side, the boards are covered by a metal front panel (chassis) that will be connected to earth.
In order to respect some safety standard I have to ensure 1500Vac of isolation between chassis and every signal provided by each frontal connector (also ethernet).
In my case I have a Single Board Computer that shows its ethernet connector on the front panel, and as you know, every computer realizes an electrical connection between its GND and chassis (metal enclosure of ethernet connector in my case).
Moreover I need to isolate some signals coming out from a DB37 connector as shown in the picture. The DB connector realizes an electrical connection between itself and chassis.
So I think I have the following problems.
1) due to electrical connection between gnd signal of Single Board Computer and chassis, I cannot ensure the 1500Vac isolation at ethernet connector.
2) My "gnd signal" is connected the "gnd field" via chassis and this defeats the electrical insulation between "gnd signal" and "gnd field".
Any suggestions?
Finally, to ensure the 1500Vac isolation I cannot connect the chassis to any gnd signal on board. I will connect chassis to an equipotential bar in the cabinet and this could keep me safe from any noise. Is it correct?
Thank you for your precious support.
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