Florida Regulations 62-814.450: Electric and Magnetic Field Standards
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(1) Existing electrical facilities for which construction was commenced on or prior to March 21, 1989 (Reserved).
(2) New transmission lines and substations.
(a) The maximum electric field at the edge of the transmission line ROW containing a 500 kV nominal voltage or less transmission line or at the property boundary of a new substation containing facilities operating at these voltages shall not exceed 2.00 kV/m.
(b) The maximum electric field at the edge of the transmission line ROW for a line with a nominal voltage greater than 500 kV or at the property boundary of a new substation containing facilities operating at these voltages shall not exceed 5.50 kV/m.
(c) The maximum electric field on the ROW of a 230 kV or smaller transmission line shall not exceed 8 kV/m.
(d) The maximum electric field on the ROW of a transmission line with a nominal voltage greater than 230 kV and up to 500 kV shall not exceed 10 kV/m.
(e) The maximum electric field on the ROW of a transmission line greater than 500 kV shall not exceed 15 kV/m.
(f) The maximum magnetic field at the edge of a 230 kV or smaller transmission line ROW or at the property boundary of a new substation serving such lines shall not exceed 150 milliGauss.
(g) The maximum magnetic field at the edge of the transmission line ROW for a transmission line with a nominal voltage greater than 230 kV and up to 500 kV or at the property boundary of a new substation containing facilities operating at these voltages shall not exceed 200 milliGauss, except for double circuit 500 kV lines to be constructed on ROWs existing on March 21, 1989, as identified below where the limit will be 250 milliGauss.
(h) The maximum magnetic field at the edge of the transmission line ROW for a transmission line with a nominal voltage greater than 500 kV or at the property boundary of a new substation containing facilities operating at these voltages shall not exceed 250 milliGauss.
(i) For existing ROWs extending from the Andytown substation to the Orange River substation, Andytown substation to the Martin Generating Plant, and the Martin Generating Plant to the Midway substation, where the facility owner has acquired, prior to March 21, 1989, a ROW sufficiently wide for two or more 500 kV transmission lines and has constructed one or more 500 kV transmission lines on this ROW prior to March 21, 1989, the maximum magnetic field at the edge of the ROW or property boundary of a new or modified substation shall not exceed 250 milliGauss.
Table of New Transmission Line and Substation Standards
KV Rating
Property Boundary
of new Substation
Edge of Transmission Line
Right-of-Way
On the Transmission Line
Right-of-Way
<=230 kV 2.00 kV/m & 150 milliGauss 2.00 kV/m & 150 milliGauss 8 kV/m <=500 kV and > 230 kV
2.00 kV/m & 200 milliGauss [1]
2.00 kV/m & 200 milliGauss [1]
10 kV/m
>500 kV
5.50 kV/m & 250 milliGauss
5.50 kV/m & 250 milliGauss
15 kV/m
Footnote 1: Except as provided in paragraphs (2)(g) and (2)(i).
Rulemaking Authority Florida Statutes § 403.061(7), 403.523(1) FS. Law Implemented 403.061(31), 403.523 FS. History-New 3-21-89, Amended 1-7-93, Formerly 17-274.450, 17-814.450, Amended 6-1-08.
(a) The maximum electric field at the edge of the transmission line ROW containing a 500 kV nominal voltage or less transmission line or at the property boundary of a new substation containing facilities operating at these voltages shall not exceed 2.00 kV/m.
(b) The maximum electric field at the edge of the transmission line ROW for a line with a nominal voltage greater than 500 kV or at the property boundary of a new substation containing facilities operating at these voltages shall not exceed 5.50 kV/m.
(c) The maximum electric field on the ROW of a 230 kV or smaller transmission line shall not exceed 8 kV/m.
(d) The maximum electric field on the ROW of a transmission line with a nominal voltage greater than 230 kV and up to 500 kV shall not exceed 10 kV/m.
(e) The maximum electric field on the ROW of a transmission line greater than 500 kV shall not exceed 15 kV/m.
(f) The maximum magnetic field at the edge of a 230 kV or smaller transmission line ROW or at the property boundary of a new substation serving such lines shall not exceed 150 milliGauss.
(g) The maximum magnetic field at the edge of the transmission line ROW for a transmission line with a nominal voltage greater than 230 kV and up to 500 kV or at the property boundary of a new substation containing facilities operating at these voltages shall not exceed 200 milliGauss, except for double circuit 500 kV lines to be constructed on ROWs existing on March 21, 1989, as identified below where the limit will be 250 milliGauss.
(h) The maximum magnetic field at the edge of the transmission line ROW for a transmission line with a nominal voltage greater than 500 kV or at the property boundary of a new substation containing facilities operating at these voltages shall not exceed 250 milliGauss.
(i) For existing ROWs extending from the Andytown substation to the Orange River substation, Andytown substation to the Martin Generating Plant, and the Martin Generating Plant to the Midway substation, where the facility owner has acquired, prior to March 21, 1989, a ROW sufficiently wide for two or more 500 kV transmission lines and has constructed one or more 500 kV transmission lines on this ROW prior to March 21, 1989, the maximum magnetic field at the edge of the ROW or property boundary of a new or modified substation shall not exceed 250 milliGauss.
Table of New Transmission Line and Substation Standards
KV Rating
Property Boundary
of new Substation
Edge of Transmission Line
Right-of-Way
On the Transmission Line
Right-of-Way
<=230 kV 2.00 kV/m & 150 milliGauss 2.00 kV/m & 150 milliGauss 8 kV/m <=500 kV and > 230 kV
2.00 kV/m & 200 milliGauss [1]
2.00 kV/m & 200 milliGauss [1]
10 kV/m
>500 kV
5.50 kV/m & 250 milliGauss
5.50 kV/m & 250 milliGauss
15 kV/m
Footnote 1: Except as provided in paragraphs (2)(g) and (2)(i).
Rulemaking Authority Florida Statutes § 403.061(7), 403.523(1) FS. Law Implemented 403.061(31), 403.523 FS. History-New 3-21-89, Amended 1-7-93, Formerly 17-274.450, 17-814.450, Amended 6-1-08.