Agenda - Council - 06/25/2013 - Laserfiche WebLink

Home

Enterprise Park to Crooked Lake 115 kV Transmission Line March 2012 Environmental Assessment above ground). In addition to Minnesota, six other states have state -specific regulations for the maximum electric field of a transmission line, as shown in Table 5.4. State California Florida Minnesota Montana Oregon New Jersey New York Table 5.4: State -Specific Standards for Electric Fields Maximum Electric Field (kV/m) Notes No kV/m standard; however, a setback distance of 100 ft is required between new schools and the edge of HVTL ROWs for lines between 50 and 133 kV Applies to HVTL between 69 and 230 kV Standard applies to highway crossings A standard of 7 kV/m applies to highway crossings; a standard of 11 kV/m applies to private road crossings; the maximum electric field for all locations is 11.8 kV/m Source: California Electric and Magnetic Fields Program, 2000. 8 8 7 9 7 7-11.8 Magnetic fields are created by and are solely dependent upon the electrical current in a conductor. Magnetic field strength is measured in milliGauss (mG). Similar to electric fields, the strength of a magnetic field decreases rapidly as the distance from the source increases. However, unlike electric fields, magnetic fields are not easily shielded or weakened by objects or materials. There are no federal or Minnesota regulations for the permitted strength of a magnetic field from a transmission line. Only Florida, Massachusetts, and New York have state regulations for the permitted strength of a magnetic field from a transmission line, which are set at 150 mG, 85 mG, and 200 mG, respectively, for transmission lines less than 230 kV in size. A number of international health and safety organizations have developed guidelines for EMF exposure, which are shown in Table 5.5. 33