What type of ladders should be avoided near powerlines?

When considering the safety of ladder use near power lines, the correct answer highlights that both metal ladders and wet wooden ladders should be avoided. Metal ladders are inherently conductive, meaning they can easily carry electrical current if they come into contact with power lines. This poses a significant risk of electric shock or electrocution to anyone using the ladder.

Similarly, wet wooden ladders can also be risky because moisture in the wood can enhance its conductivity. While wood is generally considered an insulator, when it is wet, it becomes more conductive and can also pose a risk of electrical hazards when in proximity to power lines.

By recognizing that both types of ladders present potential dangers in such environments, it is clear why the avoidance of these ladders near power lines is critical for ensuring safety. Such precautions prevent accidents and promote safer work practices in areas where electrical lines are present.