Power lines: specific voltages

Use the links in the table to find the field for any specific power lines.

All these graphs show the actual field values. The alternative of presenting fields as percentages of the maximum field can be misleading. These calculations assume the currents within each circuit are balanced, which makes little difference to the higher fields at closer distances but can affect the smaller fields at larger distances. More on the effect of balance.

Overhead Lines Underground Cables
400 kV
photo of 400 kV L6 pylonphoto of 400 kV L2 pylon

overhead magnetic field
see also
"T-pylons"
low-height pylons
single-circuit pylons

overhead electric field

underground magnetic field

275 kV

overhead magnetic field

overhead electric field

underground magnetic field

132 kV

photo of 132 kV pylonphoto of 132 kV wood pole

overhead magnetic field

overhead electric field

underground magnetic field

66 kV

overhead magnetic field

overhead electric field

underground magnetic field

33 kV

photo of double circuit 33 kV wood polephoto of single circuit 33 kV wood pole

overhead magnetic field

overhead electric field

underground magnetic field

11 kV

photo of 11 kV wood pole

overhead magnetic field

overhead electric field

underground magnetic field

400 V

photo of 400 V wood polephoto of 400 V wood pole with abc

overhead magnetic field

overhead electric field

underground magnetic field

Raw Data

icon indicating availability of dataIn the spirit of openness, most of the raw data used to plot these graphs are available as downloadable spreadsheets.

These pages deal with the size of the field.  See also information on the direction of the field.

For comparison of fields from different voltage lines click here:

link to page of comparisons