The Impact Of Rainy Weather On The Installation Of Cable Clamps In Parallel Trenches

Rainwater entering the contact interface between the conductor and bimetal pg clamp forms a water film on the metal surface. This water film hinders direct contact between the conductor and the inner wall of blackburn parallel groove clamp, reducing the conductivity of the contact surface. Even if surface moisture is wiped away during installation, humidity in the air will still condense at the metal gaps. burndy parallel groove clamp relies on the contact pressure generated by bolt tightening to achieve electrical connection; the presence of moisture causes the contact resistance after crimping to exceed design standards, leading to abnormal heating at the contact point during long-term operation.

A humid environment accelerates the formation of an oxide film on the aluminum conductor surface. Conductor cleaning requires removing the surface oxide layer with sandpaper or a wire brush, exposing the metallic luster, and then immediately proceeding with the installation of connector parallel groove. During rainy weather, the cleaned conductor surface will reform an oxide film within minutes. This newly formed oxide layer has the same properties as the original oxide layer, both increasing contact resistance. Even after mechanical fixing of groove clamp, the electrical performance will not meet design requirements.