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1 / 4 page TB-2000 March 2012 Page 1 of 4 Installation and Maintenance of ESD Mats Introduction The purpose of an ESD worksurface is to aid in the prevention of damage to ESD sensitive components and assemblies from electrostatic discharge. An ESD worksurface provides protection in the following two ways: 1. Providing an antistatic worksurface area that will limit static electricity generation. 2. Removing the charge from a conductive object placed on the worksurface. A dissipative worksurface having a surface resistance of at least 1 x 10E6, but less than 1 x 10E9 ohms is recommended by worksurface standard ANSI/ESD S4.1. Dissipative materials minimize the generation of static charges, and will dissipate a charge slow enough so that a spark will not occur. Dissipative materials are usually the preferred choice for bench top worksurfaces. Conductive materials are the quickest to remove a charge, but they can also cause damage by discharging too rapidly. Conductive materials are usually used as floor mats, which is defined by ANSI/ESD S7.1 as less than 1 x 10E6 ohms. General Grounding Guidelines 1. ANSI/ESD S20.20 requires that all conductors in an ESD protected area, including personnel, must be grounded. 2. The ESD ground must be tied directly to and at the same potential as the building or “green wire” equipment ground. 3. Per ANSI/ESD S20.20, the ESD control program can in no way replace or supercede any requirements for personnel safety. Ground fault circuit interrupters (GFCI) and other safety protection should be considered wherever personnel might come into contact with electrical sources. 4. All electrical outlets should be verified for proper wiring configuration, resistance or impedance and GFCI function when the mat is installed and periodically thereafter. Common Point Grounds A common point ground is defined by the grounding standard ANSI/ESD S6.1, as: 1. A grounded device where two or more conductors are bonded. 2. A system or method for connecting two or more grounding conductors to the same electrical potential. Examples of common point grounds with ground cords are illustrated below. Figure 2. Other ground cords. Figure 3. 09814 with screw allows ground cord to be bolted to mat to keep cord from disconnecting. Common point grounds are designed to provide ground for worksurface mats, wrist straps, and other items. NOTE: DO NOT DAISY CHAIN. Because of the high resistances inherent to many types of protective surfaces, daisy chaining of these materials can severely limit their ability to properly dissipate and protect against static charges. 09817 09814 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 TECHNICAL BULLETIN TB-2000 Made in the United States of America © 2012 DESCO INDUSTRIES INC. Employee Owned 09835 09740 Figure 1. Typical common point grounds. 09837 09825 COMMON POINT GROUND Per ANSI/ESD S6.1, Grounding section 4.1.1 “Every element to be grounded at an ESD protected station shall be connected to the same common point ground.” ESD Handbook ESD TR20.20 section 5.1.3 Basic Grounding Requirements “The first step in ensuring that everything in an EPA is at the same electrical potential is to ground all conductive components of the work area (worksurfaces, people, equipment, etc.) to the same electrical ground point. This point is called the common point ground. The next step in completing the ground circuit is to connect the common point ground to the equipment ground (third wire, green).” WRONG! RIGHT Figure 4. ESD mats should never be grounded in series, that is daisy chained. |
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