Re: Earthing of conductive floor tiles
I read in !emc-pstc that Arno van Kesteren avkes...@eso.org wrote (in 001801c1cec6$a16ff500$55b9a...@hq.eso.org) about 'Earthing of conductive floor tiles', on Mon, 18 Mar 2002: Do conductive tiles in floors for ESD prevention have to be connected together (e.g. through a low impedance earth bond) ? There is to be an IEC standard IEC61340 on this subject: IEC 61340-4-1, Ed. 2: Electrostatics - Part 4-1: Standard test methods for specific applications - Electrical resistance of floor coverings and installed floors IEC 61340-4-5: Electrostatics - Part 4-5: Standard test methods for specific applications - Methods for characterising the electrostatic protection of footwear and flooring in combination Information about work in IEC TC101 on this subject is available on the public part of the IEC web site http|://www.iec.ch If you need more information, please contact me by e-mail. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Earthing of conductive floor tiles
Funny you should mention that. We had the same problem only it turned out to be an access plate in our turntable. Even though the plate is screwed into the turntable, over time the screws loosen enough through vibrations and the plate starts arcing. Like all great inventions, we accidentally found this out during our troubleshooting by making a scan with the access plate removed. The plate is now a permanent part of our turntable preventive maintenance schedule. Bob Heller 3M Product Safety, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 = - Forwarded by Robert E. Heller/US-Corporate/3M/US on 03/20/2002 12:14 PM - Hans Mellberg emcconsultant@ To: David Spencer dspen...@oresis.com yahoo.com 'Arno van Kesteren ' avkes...@eso.org 'emc-p...@majordomo.ieee.org ' emc-p...@majordomo.ieee.org 03/20/2002 cc: (bcc: Robert E. Heller/US-Corporate/3M/US) 10:31 AM Subject: RE: Earthing of conductive floor tiles Please respond to Hans Mellberg Several years ago I was called in to debug a chamber that had spurious emissions whilst turning the table. Naturally, everyone accused the tt manufacturer but after several hours of frustrating dead ends, it turned out that the small amount of vibration caused by the tt was causing the floor tiles to move and shift ever so slightly. This was enough for small amounts of static charge to develop and discharge causing the emissions in the chamber. Once this was ascertained, grounding the floor tiles eliminated the problem. We used copper tape under every tile folded over till the tile manufacturer came in with a permanent solution which included spring fingers. These metal lined tiles were for a false raised floor for cabling and a/c and not the ferrite types. --- David Spencer dspen...@oresis.com wrote: Hi Arno, John gave you the short answer...the MFG should have installation instructions. In all of the installation I have been party, there is a grid of copper tape laid down in the conductive adhesive. This keeps the adhesive from getting excessively resistive over large areas. Surface resistance tests run anywhere from 100k-400k ohms when it's all done. Note that if you are installing relay racks or metal benches that you can run into ground loops. Have a Great Day, Dave Spencer Oresis Communications -Original Message- From: Arno van Kesteren To: Arno van Kesteren; emc-p...@majordomo.ieee.org Sent: 3/18/02 1:48 PM Subject: Earthing of conductive floor tiles Dear Group, Do conductive tiles in floors for ESD prevention have to be connected together (e.g. through a low impedance earth bond) ? Arno van Kesteren ESO Munich, Germany e-mail: avkes...@eso.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard
RE: Earthing of conductive floor tiles
Several years ago I was called in to debug a chamber that had spurious emissions whilst turning the table. Naturally, everyone accused the tt manufacturer but after several hours of frustrating dead ends, it turned out that the small amount of vibration caused by the tt was causing the floor tiles to move and shift ever so slightly. This was enough for small amounts of static charge to develop and discharge causing the emissions in the chamber. Once this was ascertained, grounding the floor tiles eliminated the problem. We used copper tape under every tile folded over till the tile manufacturer came in with a permanent solution which included spring fingers. These metal lined tiles were for a false raised floor for cabling and a/c and not the ferrite types. --- David Spencer dspen...@oresis.com wrote: Hi Arno, John gave you the short answer...the MFG should have installation instructions. In all of the installation I have been party, there is a grid of copper tape laid down in the conductive adhesive. This keeps the adhesive from getting excessively resistive over large areas. Surface resistance tests run anywhere from 100k-400k ohms when it's all done. Note that if you are installing relay racks or metal benches that you can run into ground loops. Have a Great Day, Dave Spencer Oresis Communications -Original Message- From: Arno van Kesteren To: Arno van Kesteren; emc-p...@majordomo.ieee.org Sent: 3/18/02 1:48 PM Subject: Earthing of conductive floor tiles Dear Group, Do conductive tiles in floors for ESD prevention have to be connected together (e.g. through a low impedance earth bond) ? Arno van Kesteren ESO Munich, Germany e-mail: avkes...@eso.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Sports - live college hoops coverage http://sports.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Earthing of conductive floor tiles
They can be. It depends upon what your requirements for conductivity with the floor are. You can also use plain old bare concrete floors without any coverage. They have been known to be sufficient for some conductive requirements. Concrete flooring can be sufficient for such things as storage or not-so-strict assembly areas. But, concrete can be dependent upon the water table and/or moisture content of the ground it's on. Or, the floor can be painted with conductive paint. A paint specifically made for floors. But you may have to monitor the floor more often. Paint has a tendency to chip. Or you can have the tiled flooring bonded to building earth ground with copper strips. Or, you may not have to have the tiles connected with copper strips. Best to have a defined goal of conductivity that you're going to need, then work from there. If you need clean room or telco/Bellcore or medical equipment mfr type grounding, you might consider using the tiles because their conductivity is repeatable and reliable no matter what. - Doug McKean --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Earthing of conductive floor tiles
Hi Arno, John gave you the short answer...the MFG should have installation instructions. In all of the installation I have been party, there is a grid of copper tape laid down in the conductive adhesive. This keeps the adhesive from getting excessively resistive over large areas. Surface resistance tests run anywhere from 100k-400k ohms when it's all done. Note that if you are installing relay racks or metal benches that you can run into ground loops. Have a Great Day, Dave Spencer Oresis Communications -Original Message- From: Arno van Kesteren To: Arno van Kesteren; emc-p...@majordomo.ieee.org Sent: 3/18/02 1:48 PM Subject: Earthing of conductive floor tiles Dear Group, Do conductive tiles in floors for ESD prevention have to be connected together (e.g. through a low impedance earth bond) ? Arno van Kesteren ESO Munich, Germany e-mail: avkes...@eso.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Earthing of conductive floor tiles
I read in !emc-pstc that Arno van Kesteren avkes...@eso.org wrote (in 001801c1cec6$a16ff500$55b9a...@hq.eso.org) about 'Earthing of conductive floor tiles', on Mon, 18 Mar 2002: Do conductive tiles in floors for ESD prevention have to be connected together (e.g. through a low impedance earth bond) ? The manufacturer will give you full installation instructions. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
