[PSES] Ground Plane Grounding in the Immunity Lab
Dear Members, Could you please share your experience and/or knowledge for the ground plane grounding in the immunity lab? We plan to layout a L shape ground plane in the 24' x 18' area for ESD, etc. tests. The corner of the L shape is right next to a 10 wide building collar. Is a ground strap tied to the collar good enough? Do we need (copper) ground rods? If yes, what is the minimum length (deep)? What is the recommended space between rods? How to choose metal sheet material (galvanized steel, stainless steel, etc.)? When weldering the metal sheet, is there anything that need to be cautious? Thank you very much and look forward to your help. Best regards, Grace Lin - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] Ground Plane Grounding in the Immunity Lab
You do not need any of them for EMC. Do as you deem necessary for electrical safety. Regards, Ing. Gert Gremmen, BSc Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens Grace Lin Verzonden: Friday, August 23, 2013 3:04 PM Aan: emc-p...@ieee.org Onderwerp: Ground Plane Grounding in the Immunity Lab Dear Members, Could you please share your experience and/or knowledge for the ground plane grounding in the immunity lab? We plan to layout a L shape ground plane in the 24' x 18' area for ESD, etc. tests. The corner of the L shape is right next to a 10 wide building collar. Is a ground strap tied to the collar good enough? Do we need (copper) ground rods? If yes, what is the minimum length (deep)? What is the recommended space between rods? How to choose metal sheet material (galvanized steel, stainless steel, etc.)? When weldering the metal sheet, is there anything that need to be cautious? Thank you very much and look forward to your help. Best regards, Grace Lin - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] Ground Plane Grounding in the Immunity Lab
Grace: Welding galvanized steel is not a good idea; toxic zinc fumes. What is a building collar? Your immunity lab must be within a shielded enclosure, so it should already be safety grounded. Since you will be doing ESD testing INSIDE the enclosure, you will not have to be draining any charges of the exterior of that chamber. Metal sheet material for where; the chamber walls, the ground plane table? Ed Price WB6WSN Chula Vista, CA USA From: Grace Lin [mailto:graceli...@gmail.com] Sent: Friday, August 23, 2013 6:04 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Ground Plane Grounding in the Immunity Lab Dear Members, Could you please share your experience and/or knowledge for the ground plane grounding in the immunity lab? We plan to layout a L shape ground plane in the 24' x 18' area for ESD, etc. tests. The corner of the L shape is right next to a 10 wide building collar. Is a ground strap tied to the collar good enough? Do we need (copper) ground rods? If yes, what is the minimum length (deep)? What is the recommended space between rods? How to choose metal sheet material (galvanized steel, stainless steel, etc.)? When weldering the metal sheet, is there anything that need to be cautious? Thank you very much and look forward to your help. Best regards, Grace Lin - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.org David Heald dhe...@gmail.com - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] Ground Plane Grounding in the Immunity Lab
Grace, On Fri, 23 Aug 2013 09:03:35 -0400, Grace Lin graceli...@gmail.com wrote: Could you please share your experience and/or knowledge for the ground plane grounding in the immunity lab? We plan to layout a L shape ground plane in the 24' x 18' area for ESD, etc. tests. The corner of the L shape is right next to a 10 wide building collar. Is a ground strap tied to the collar good enough? Do we need (copper) ground rods? If yes, what is the minimum length (deep)? What is the recommended space between rods? I think you can simply connect the ground plane to the grounding system already available in the building. How to choose metal sheet material (galvanized steel, stainless steel, etc.)? If mechanical strength is also required, thick sheet of galvanized steel or stainless steel may be used. Galvanized steel is cheap, but, personally, I don't like this kind of plated material as we may need to take care so that those thin plating will not be damaged. Recently, we replaced galvanized steel sheets in our old shielded rooms with austenite stainless steel sheets. If mechanical strength is not important, thin sheet of aluminum or copper may work well. In the case of IEC 61000-4-2, minimum thickness of the ground plane is 0.25 mm for copper and aluminum. Copper is electrically good but its surface may not looks so good, and can be heavy and expensive than aluminum. When weldering the metal sheet, is there anything that need to be cautious? It can become troublesome to weld thick metal sheets placed on the floor, and some material may not suitable for welding. I rather like not to weld and bond them with other means. Regards, Tom -- Tomonori Sato vef00...@nifty.ne.jp URL: http://homepage3.nifty.com/tsato/ - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] Ground Plane Grounding in the Immunity Lab
Grace, Our lab is used for testing of ITE products to the IEC 55024 (CISPR24) immunity standard. We built ours from sheets of 1/4 (6mm) 5052 aluminum, screwed down onto 1 (25mm) plywood, with the plywood then fastened to the building floor. (Our products are large, heavy, rack-based systems, and this aluminum is hard enough to prevent the rack casters from doing any damage to the plate.) A 4 (10cm) wide backing plate is placed under each butt joint, and fasted to the plates with countersunk screws about every 4 along the joint. This insures good electrical continuity across the entire plane. The backing plate does require the plywood to be routed/notched at the butt joints, to accommodate the extra thickness of the backing plate. We have two such floors, one which is about 15 years old, and have had no issues with them (electrical, mechanical, auditors). These are grounded to the building steel. One uses a flat braid, the other uses 6 gauge wire. John D. Flavin Teradata TCP Engineering 17095 Via del Campo San Diego, CA 92127 john.fla...@teradata.commailto:john.fla...@teradata.com V: (858) 485-3874 F: (213) 337-5432 From: Grace Lin [mailto:graceli...@gmail.com] Sent: Friday, August 23, 2013 6:04 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Ground Plane Grounding in the Immunity Lab Dear Members, Could you please share your experience and/or knowledge for the ground plane grounding in the immunity lab? We plan to layout a L shape ground plane in the 24' x 18' area for ESD, etc. tests. The corner of the L shape is right next to a 10 wide building collar. Is a ground strap tied to the collar good enough? Do we need (copper) ground rods? If yes, what is the minimum length (deep)? What is the recommended space between rods? How to choose metal sheet material (galvanized steel, stainless steel, etc.)? When weldering the metal sheet, is there anything that need to be cautious? Thank you very much and look forward to your help. Best regards, Grace Lin - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.orgmailto:emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.netmailto:emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.orgmailto:mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.orgmailto:j.bac...@ieee.org David Heald dhe...@gmail.commailto:dhe...@gmail.com - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] Ground Plane Grounding in the Immunity Lab
Keep in mind that a primary purpose of grounding the plane is electrical safety. Ghery S. Pettit From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Flavin, John Sent: Friday, August 23, 2013 11:55 AM To: emc-p...@ieee.org Subject: RE: [PSES] Ground Plane Grounding in the Immunity Lab Grace, Our lab is used for testing of ITE products to the IEC 55024 (CISPR24) immunity standard. We built ours from sheets of 1/4 (6mm) 5052 aluminum, screwed down onto 1 (25mm) plywood, with the plywood then fastened to the building floor. (Our products are large, heavy, rack-based systems, and this aluminum is hard enough to prevent the rack casters from doing any damage to the plate.) A 4 (10cm) wide backing plate is placed under each butt joint, and fasted to the plates with countersunk screws about every 4 along the joint. This insures good electrical continuity across the entire plane. The backing plate does require the plywood to be routed/notched at the butt joints, to accommodate the extra thickness of the backing plate. We have two such floors, one which is about 15 years old, and have had no issues with them (electrical, mechanical, auditors). These are grounded to the building steel. One uses a flat braid, the other uses 6 gauge wire. John D. Flavin Teradata TCP Engineering 17095 Via del Campo San Diego, CA 92127 john.fla...@teradata.commailto:john.fla...@teradata.com V: (858) 485-3874 F: (213) 337-5432 From: Grace Lin [mailto:graceli...@gmail.com] Sent: Friday, August 23, 2013 6:04 AM To: EMC-PSTC@LISTSERV.IEEE.ORGmailto:EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Ground Plane Grounding in the Immunity Lab Dear Members, Could you please share your experience and/or knowledge for the ground plane grounding in the immunity lab? We plan to layout a L shape ground plane in the 24' x 18' area for ESD, etc. tests. The corner of the L shape is right next to a 10 wide building collar. Is a ground strap tied to the collar good enough? Do we need (copper) ground rods? If yes, what is the minimum length (deep)? What is the recommended space between rods? How to choose metal sheet material (galvanized steel, stainless steel, etc.)? When weldering the metal sheet, is there anything that need to be cautious? Thank you very much and look forward to your help. Best regards, Grace Lin - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.orgmailto:emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.netmailto:emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.orgmailto:mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.orgmailto:j.bac...@ieee.org David Heald dhe...@gmail.commailto:dhe...@gmail.com - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.orgmailto:emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.netmailto:emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.orgmailto:mcantw...@ieee.org For policy questions, send mail to: Jim Bacher j.bac...@ieee.orgmailto:j.bac...@ieee.org David Heald dhe...@gmail.commailto:dhe...@gmail.com - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html
Re: [PSES] Ground Plane Grounding in the Immunity Lab
In message beec1fc38f37bc4da6df70db9d7d0e3608d9c...@sushdc8002.td.teradata.com, dated Fri, 23 Aug 2013, Flavin, John john.fla...@teradata.com writes: Our lab is used for testing of ITE products to the IEC 55024 (CISPR24) immunity standard. Not IEC 55024, which does not exist, but EN 55024. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Why is the stapler always empty just when you want it? John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
