All high voltage transmission lines are provided with overhead shield wires for lightning protection.
However, the number of shield wires on these lines seems to vary. Some have just one wire attached to the top of the towers, but others have two wires attached to a cross arm. Both of the photos show a two-circuit transmission line (three wires on each side of the tower) and the first one has only one shield wire at the top, but the second has two wires attached to the upper cross arm.
It seems that lightning protection for power lines should be designed in accordance with uniform engineering standards, yet the variations indicate there is some difference in opinion about what is adequate.
However, the number of shield wires on these lines seems to vary. Some have just one wire attached to the top of the towers, but others have two wires attached to a cross arm. Both of the photos show a two-circuit transmission line (three wires on each side of the tower) and the first one has only one shield wire at the top, but the second has two wires attached to the upper cross arm.
It seems that lightning protection for power lines should be designed in accordance with uniform engineering standards, yet the variations indicate there is some difference in opinion about what is adequate.
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