… a star washer was not acceptable for military grounding. The rationale was that the points of the star washer created the conductive grounding path. Since the points were fairly small, and the ground fault current was high, a fault current would be forced to flow across those tiny point-contacts.
According to the Ingalls study (referenced by Ted Eckert): “After the end of testing, some team members voiced a concern about the smaller contact surface when grounding washers are substituted for a Class B bond. A current test was devised and is detailed in Attachment 12. It was demonstrated that the grounding washers have more than adequate current carrying capacity. The grounding washer contact points are able to carry more than enough current to trip a breaker or allow a ground to be detected.” Best regards, Rich - ---------------------------------------------------------------- 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 <[email protected]> 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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
