Good Morning Janne! It has been my experience that units seperate from the control cabinet that supplies power to them are grounded to the same ground potential as the the cabinet, assuming you are not using an IT type power system (which is what is used in the Nordic countries for example) where the PE is seperated from true ground by protective impedances.
IEC 60204-1 indicates that all parts of equipment should have earth continuity back to the primary earth stud/connection. In fact, section 19 gives testing requirements for this to be 0.1 ohms or less. I hope this helps. Please email me if you need specific data. Regards, Frank West Sr. Engineer TUV Rheinland NA --- Janne_Engström <janne.engst...@ivtg.se> wrote: > > Hi all, > > We are manufacturing heating equipment for > industrial use. > Our equipment is one part in an "in line" setup of > machines. > We are required, by one company we deliver to, to > provide a wire > for equalizing the earth potential between our > control cabinet and > the frame of the main machine. > > The heater is about 50kW at 400V. > > The required wire is 35 square millimeters copper > wire. > > The equiment in this case is for the European > market. > > I think what they are afraid of is that current will > flow in the shields in > the control cables between the different parts of > the setup, creating problems. > > Are there any standards that require this? Is this > "standard procedure"? > > Best regards > > Janne Engstrom > > > > > --------- > This message is coming from the emc-pstc discussion > list. > To cancel your subscription, send mail to > majord...@ieee.org > with the single line: "unsubscribe emc-pstc" > (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list > administrators). > > > __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
