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Any ungrounded conductors can be charged to a large potential with respect to ground when brought near an electric field. An ESD event will naturally follow if the charged conductor is brought into contact or near proximity to ground (or any large potential difference) via a very conductive path (<1x103 ohms). This is why one of the most significant contributions to a good ESD control program is to remove all unnecessary charge generators (insulators) and ground all conductors. If a necessary insulator must be used in the process, it should be controlled with the appropriate control device such as an ionizer.