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109 <br />Security Guidelines for the Electricity Sector: <br />Physical Security <br />Related Documents: <br />— Security Guidelines for the Electricity Sector: Guideline Overview <br />— Security Guidelines for the Electricity Sector: <br />• Vulnerability and Threat Assessment <br />• Threat Response <br />• . Emergency Plans <br />• Continuity of Business Processes <br />• Communications <br />• Cyber Security <br />• Employment Background Screeping <br />• Protecting Potentially Sensitive Information <br />— An Approach to Action for the Electricity Sector, Version 1, NERC, <br />June 2001, http: /Iwww.nere.com <br />— Threat Alert Levels and Physical Response Guidelines, NERC, <br />November, 2001, http: / /www.nerc.com <br />— Threat Alert Levels and Cyber Response Guidelines, NERC, March <br />2002, http: / /www.nerc.com <br />Revision History: <br />Date Version Number Reason /Comments <br />Version 1.0 Security Guideline: Physical Security <br />June 14, 2002 Page 4 of 4 <br />North American Electric Reliability Council <br />