The following is strictly my own opinion regarding star washers. Others here probably have lots more experience than I. The following is also regarding bare metal-to-metal contact only. I always require masking off around the area where grounding is done.
First, the only way the grounding integrity of whatever you end up doing can be checked as being sufficient is to check it with the ground current test. Second, the integrity of the ground is highly dpendent upon the torque imposed upon the the nut or screw used for securement. Get a calibrated torque tool for the job. Thirdly, I've had some very serious discussions with some NRTL test engineers regarding external toothed star washers versus internal toothed start washers. It was *require* at one time for me to use internal toothed star washers to protect the integrity of the cutting action of the teeth to chassis. It was *suggested* at another time by another engineer to use external toothed star washers so that the integrity of the teeth could be easily inspected. My personal preferences are: 1) use only metal-to-metal contact for any sort of ground, 2) if in any doubt - test it. Regards, 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"
