Panel Building
Panel Building
(OP)
A few times a year I build panels for machine tool retrofits usally 3 phase 480. I always ground one side of the 115 vac control transformer as well as the 24vdc and -+15 vdc supplies.
These are grounded to coppper plate (in the panel) and usally connected to a ground rod and the primary service ground as well.
Is the the industry standard?
Thanks in Advance
These are grounded to coppper plate (in the panel) and usally connected to a ground rod and the primary service ground as well.
Is the the industry standard?
Thanks in Advance





RE: Panel Building
RE: Panel Building
"Venditori de oleum-vipera non vigere excordis populi"
RE: Panel Building
Wheels within wheels / In a spiral array
A pattern so grand / And complex
Time after time / We lose sight of the way
Our causes can't see / Their effects.
RE: Panel Building
This application includes both scale and rotary encoder fedback
I have never had any problems ever with this method with noise etc.
Just thought I would throw that out as they are not simple applications.
Thanks to all that responded
RE: Panel Building
As an example, the DC supply in our power plants is isolated from the ground grid. However, over the course of many upgrades, etc, somewhere in the system at one of the plants, the DC common was tied to earth ground, this, of course, defeated the isolation. I believe this could be an external wire an electrician added or could be from some piece of equipment, which uses AC and DC power, tying the two commons together in their equipment (I think this happens alot).
So to answer your question, I would say many DC systems have the return tied to ground. It would all depend on the final installation and internal design of the device.
As far as DC supplies in a panel being tied to ground, I have seen some that do and some that dont but mostly they do.
RE: Panel Building
In most other cases it's best to ground if you can. Prevents large potential differences between the DC circuit and earth ground in the event of system faults or lightning.
Old Dave
RE: Panel Building
Please read Thread748-106713.
I posed a simular question to EU Standards forum and got no affirmative response from them.
David Baird
mrbaird@hotmail.com
Sr Controls Engineer
EET degree.
Journeyman Electrician.
RE: Panel Building
Regards,
Afterhrs