Laserfiche WebLink
Table 11: Electric and Magnetic Field Guidelines from Internationally Organizations <br />Organization <br />Electric Field (kV/m) <br />Magnetic Field (mG) <br />General <br />Public <br />Occupational <br />General <br />Public <br />Occupational <br />IEEE <br />5 <br />20 <br />9,040 <br />27,100 <br />ICNIRP <br />4.2 <br />8.3 <br />830 <br />4,200 <br />ACGIH <br />--- <br />25 <br />--- <br />10,000/1,0w <br />NRPB <br />4.2 <br />--- <br />830 <br />4,200 <br />European Union <br />4.2 <br />--- <br />830 <br />--- <br />Source: IEEE - Institute of Electrical and Electronics Engineers, ICNIRP - International Commission on Non - <br />Ionizing Radiation Protection, ACGIH -American Conference of Industrial Hygienists, NRPB - National <br />Radiological Protection Board <br />a for persons with cardiac pacemakers or other medical electronic devices. <br />Estimated electrical fields at maximum operating voltage for the proposed project, as provided by <br />the applicant, are presented in Table 12. The expected electric fields for the structure type and <br />voltage proposed have been calculated at various distances from the centerline. <br />Table 12: Calculated Electric Fields (kV/m) for Proposed Orono 115 kV Transmission Line <br />(3.28 feet above ground) <br />Source: Xcel Energy, 2011a, and Xcel Energy, personal communication, November 22, 2011. <br />* Maximum operating voltage is the nominal voltage plus five percent (i.e. 115 kV + 5.75 = 121 kV). <br />The closest home to the transmission line is approximately 275 feet. The highest calculated electric <br />field directly under the transmission line is 1.09 kV/m. As indicated by the applicant in the route <br />permit application and subsequent information, the highest calculated electric fields at 100 and 200 <br />feet from transmission centerline would be 0.104 kV/m and 0.025 kV/m, respectively (Xcel Energy, <br />personal communication, November 22, 2011). These electric field strengths are within the range of <br />Environmental Assessment <br />PUC Docket E002/TL-11-223 Page 33 <br />Maximum <br />Distance to Proposed Centerline (feet) <br />Operating <br />Voltage <br />Structure Type <br />(W) <br />-300 <br />-200 <br />-100 <br />-75 <br />-50 <br />-25 <br />0 <br />25 <br />50 <br />75 <br />100 <br />200 <br />300 <br />Single Pole <br />H -Post Vertical <br />121 <br />.011 <br />.021 <br />.043 <br />.037 <br />.037 <br />.338 <br />1.09 <br />.668 <br />.130 <br />.030 <br />.049 <br />.025 <br />.012 <br />115 kV Single Circuit <br />Single Pole <br />Davit Arm 115 <br />kV/ 115kV Double <br />121 <br />.002 <br />.005 <br />.011 <br />.005 <br />.071 <br />.341 <br />.437 <br />.341 <br />.071 <br />.005 <br />.011 <br />.005 <br />.002 <br />Circuit <br />Single Pole Davit Arm <br />115 kV/ 115kV Double <br />121 <br />Circuit <br />.002 <br />.004 <br />.004 <br />.014 <br />.088 <br />.278 <br />.107 <br />.294 <br />.089 <br />.014 <br />.004 <br />.004 <br />.002 <br />w/ Dist. Under Build <br />Single Pole <br />Y -Frame <br />121 <br />.005 <br />.015 <br />.104 <br />.215 <br />.507 <br />.977 <br />.295 <br />.977 <br />.507 <br />.215 <br />.104 <br />.015 <br />.005 <br />115 kV Single Circuit <br />Source: Xcel Energy, 2011a, and Xcel Energy, personal communication, November 22, 2011. <br />* Maximum operating voltage is the nominal voltage plus five percent (i.e. 115 kV + 5.75 = 121 kV). <br />The closest home to the transmission line is approximately 275 feet. The highest calculated electric <br />field directly under the transmission line is 1.09 kV/m. As indicated by the applicant in the route <br />permit application and subsequent information, the highest calculated electric fields at 100 and 200 <br />feet from transmission centerline would be 0.104 kV/m and 0.025 kV/m, respectively (Xcel Energy, <br />personal communication, November 22, 2011). These electric field strengths are within the range of <br />Environmental Assessment <br />PUC Docket E002/TL-11-223 Page 33 <br />