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2 / 4 page TB-2000 Page 2 of 4 Grounding Methods Method 1 (Grounding via ground cords) 1. Desco recommends using a common point ground cord when grounding via ground cords. Most common point ground cords will ground your ESD worksurface and provide banana jack ground points for two wrist straps. 2. A common point ground should be installed at each workstation and should be connected directly to a verified “green wire” equipment ground. Only one groundable point should exist on a worksurface. Figure 5. Common point ground for each workstation. 3. Wrist straps should never be grounded through a worksurface, as the added resistance of the worksurface material will prevent the wrist strap from operating properly. Figure 6. Proper grounding of wrist straps. 4. Per ANSI/ESD S1.1, a current limiting resistor in the wrist strap ground cord is recommended. If other than a one megohm resistor, special marking in red is required. For additional information on grounding we recommend Desco Technical Bulletin TB-2007. Groundable Point Installation 1. Before installing a groundable point on your mat you must first determine whether you will need a snap socket or stud, the type of snap hardware and the location. 2. Desco has three types of 10mm (.395") field installable mat grounding snaps. The first type is a screw-on snap kit Desco item number 09864 Universal Snap Kit. A. Determine the position of the grounding snap (one only per mat) and type of fastener you will be installing (socket or stud). Take precautions not to cut your hand, and punch a hole through the material with a small Phillips screwdriver or awl. B. Remove the release paper from the circular common point ground label and affix it so that it aligns with the hole on the material. C. Select one of the screws as follows: Material less than .100" thick - short screw Material greater than .100" thick - long screw D. Insert the screw through the top on the snap stud or socket, the washer, the label and the material. Affix the assembly with the conical nut supplied with the kit and tighten down the screw using a Phillips screwdriver. E. Remaining will be either a 10mm stud or socket, and either a long or short screw to be discarded or saved for another application. ASSEMBLE SCREW, STUD, WASHER, LABEL AND CONICAL NUT AS SHOWN DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178 DESCO EAST - One Colgate Way , Canton, MA 02021-1407 • (781) 821-8370 • Web Site: Desco.com WRONG! RIGHT! Figure 8. Installing Universal Snap Kit on mat. USE A PHILLIPS SCREWDRIVER OR AWL TO PUNCH A HOLE IN THE MATERIAL © 2012 DESCO INDUSTRIES INC. Employee Owned Figure 7. Three kinds of snaps. 3. The second type of mat grounding snap is the push and clinch snap. This snap is designed for use with any type of soft mat material: dissipative, conductive or multi-layered. It is recommended for use with three-layered material, because it provides excellent contact with the internal conductive scrim layer. It is recommended that before inserting this snap, the mat be punctured with a sharp tool where the snap will be placed. Take precautions not to cut your hand. Push and Clinch snaps are available as a snap stud as item #09861 and as a snap socket as item #09863. A. Remove the release paper from the circular label and affix it onto the mat material in the desired location. B. Center the prongs on the snap assembly with the label. Apply pressure to the snap until the prongs come through the back of the mat, then clinch over prongs to secure snap as shown in Figure 9. |
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