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Old 02-22-07, 06:05 PM   #1
phantomcow2
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Grounding, does it need to be earth?

I am almost done! Final wiring for my 6 month project is about to be complete. I've got a lot of things grounded already. When I think of it, I think everything is connected to the power ground of my house; earth. What about my shielded cable though? Do I need to connect the one end of the cable to the same ground? Or could I simply connect it to the steel enclosure I have for all my electronics?
Also, I've got a small 5v and 12v power supply which has a ground terminal. Should this be grounded right to the house ground as well?
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Old 02-22-07, 06:07 PM   #2
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I should also add that some of the shielded cable will carry 160vDC, some will carry only 12vDC. 2.5aRMS for the 160v line. And only 10mA for the 12v line
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Old 02-22-07, 06:14 PM   #3
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Don;t forget to post pics.
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Old 02-22-07, 06:15 PM   #4
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I was thinking of making a little video on my Digicamera and Youtube it.
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Old 02-22-07, 06:25 PM   #5
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Quote:
Originally Posted by phantomcow2
I am almost done! Final wiring for my 6 month project is about to be complete. I've got a lot of things grounded already. When I think of it, I think everything is connected to the power ground of my house; earth. What about my shielded cable though? Do I need to connect the one end of the cable to the same ground? Or could I simply connect it to the steel enclosure I have for all my electronics?
Also, I've got a small 5v and 12v power supply which has a ground terminal. Should this be grounded right to the house ground as well?
I don't think I'm up to explaining all of the possibilities regarding proper grounding. As a rule of thumb, a common ground will ensure that you are not pulling your hair out chasing down weird problems caused by ground loops. That said, there are also valid reasons for isolating grounds for different circuits, so without a schematic of what you are doing, I can't give you good advice. It's also been a good ten years since I last designed any electronic circuitry - just sayin.
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Old 02-22-07, 06:39 PM   #6
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Ground loops was my concern. Basically here is how it all goes together:

I've got 3 (soon to be 4) step motors. These are the 160v 2.5aRMS lines. THey connect to their own drive. All drives are inside a steel, HOffman enclosure. All drives get their AC input from one, 14gage cable coming into the box. Then I've got three limit switches, these are the 12v 10mA lines. These interface with printer port inside the box as well.
Theres also a little 12v 2A power supply inside the box. Hope this makes more sense now
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Old 02-22-07, 07:00 PM   #7
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Ground loops was my concern. Basically here is how it all goes together:

I've got 3 (soon to be 4) step motors. These are the 160v 2.5aRMS lines. THey connect to their own drive. All drives are inside a steel, HOffman enclosure. All drives get their AC input from one, 14gage cable coming into the box. Then I've got three limit switches, these are the 12v 10mA lines. These interface with printer port inside the box as well.
Theres also a little 12v 2A power supply inside the box. Hope this makes more sense now
All DC grounds, motor/drive/switch/ps chassis, enclosure and one side of shielded cables to earth ground, IMO. If you have any problems with noise, you may want to isolate the DC grounds from the rest of the chassis/earth grounds.
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Old 02-22-07, 07:02 PM   #8
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You're ground, go to your room!!!
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Old 02-22-07, 07:08 PM   #9
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So what did you build and will your local power grid support it?
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Old 02-22-07, 07:27 PM   #10
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Earth ground it is then, I was leaning that way anyways. Thanks.
My whole project does not take much more energy than a small electric heater.
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Old 02-22-07, 10:16 PM   #11
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Good luck on the project, regardless of number of common grounds it has.
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