GBP 57 ESD EPA = Electrostatic Protected Area A comprehensive EPA zone covers the following areas (minimum requirement according to DIN EN 61340-5-1): Storage / Containers Dissipative ESD shelves and containers for transporting and storing devices protect Workspace / Workstation at-risk devices. An ESD protected workspace should be ergonomically adaptable. Roller cabinets should have conductive Electrostatic charge is dissipated via the working area and a grounding cable, wheels. so the workspace remains charge-neutral. Grounding of personnel People are the main source of electrostatic charges. Shoes and wristbands with grounding cables are mandatory for employees working in electronics production. Wristband and shoe testers make the daily checking of EPA effectiveness easier. Chairs and standing stools should also have ESD protection. Tools To ensure safe handling of your components you should use ESD-compliant tools. Floor The floor should be conductive and meet the required limits of DIN EN 61340-5-1. Markings Floor markings identify ESD protected areas. Signs and labels are equally important 97 When cleaning ESD floors, use only cleaning products that do not create layers, for signalling potentially at-risk components and assemblies. so that the conductivity values remain within the desired range. You can watch a video on how to plan an electrostatic protected area on If only individual workstations are set up as EPA, ESD floor mats or tiles can be Hoffmann Group TV under the quick link: http://ho7.eu/esd2 fitted with grounding, but these must be clearly marked. Measuring equipment It is essential to test protection devices regularly using measuring equipment. Measurements must always be taken when entering an EPA and regular personnel checks must be performed. Work tables, floor mats and grounding connections must be checked on a monthly basis and ESD monitoring instruments must be checked annually. The discharge resistance should have the following values: ■ Work surfaces: less than 1×109 Ω. ■ Floors: less than 1×109 Ω. ■ Chairs/standing stools: less than 1×109 Ω. ■ Tools: less than 1×1012 Ω. 563