The angle iron fixed horizontally on the top of the telephone pole has a porcelain bottle on it to support the overhead wire. The role of the cross arm: The cross arm is an important part of the tower. Its role is to install insulators and fittings to support the conductors and lightning conductors, and maintain a certain safe distance according to the regulations.
According to the purpose, it can be divided into: straight cross arm; corner cross arm; tensile cross arm.
According to the material, it can be divided into: iron cross arm; porcelain cross arm; synthetic insulation cross arm. A
Straight line: only consider the normal and horizontal load of the wire under normal unbroken conditions;
Tension-resisting cross arm: In addition to bearing the vertical and horizontal load of the wire, it will also bear the difference in the tensile force of the wire;
Corner cross arm: In addition to bearing the vertical and horizontal load of the wire, it will also bear a large single-side wire tension.
According to the force of the crossarm, a single crossarm is used for the straight rod or the corner bar below 15, and the double crossarm is used for the corner bar, the tensile bar, the terminal bar, and the branch bar with a corner of more than 15 degrees.
Crossbars are generally installed at a distance of 300 mm from the top of the pole. Straight crossbars should be installed on the power receiving side. Crossbars for corner bars, terminal poles, and branch bars should be installed on the cable side.