Parallel Trench Clamp Molding Installation: Why It Can Fundamentally Prevent Moisture Intrusion.

In the long-term operation and maintenance of overhead power lines, the moisture-proof performance of the connection points often determines the stability of the entire line. Once metal conductors are exposed to moisture for extended periods, oxide film forms rapidly, contact resistance increases, and eventually leads to overheating or even circuit breakage. The emergence of molding installation technology is a structural solution to this problem. It fills and solidifies the gap between pg clamp connector and the wire with insulating material, physically cutting off the path for moisture to penetrate.

Mechanism of Sealed Interface Formation

Traditional bolted installation relies on manual tightening torque, inevitably leaving microscopic gaps between the clamp and the conductor, allowing humid air and moisture to continuously penetrate along the stranded wire gaps. The molding process differs: under hydraulic pressure or specialized tools, the insulating molding material completely fills the outer stranded gaps of the conductor during the instant of pressure molding, forming a continuous, seamless sealed interface after curing. This means that the conductive contact area of pg clamps is completely enclosed, and water molecules in the external environment lose their entry channels.

This process involves three layers of protection:

• Physical sealing: The molded body adheres tightly to the outer layer of the aluminum stranded wire, eliminating capillary channels;

• Chemical isolation: The insulating material itself has hydrophobic properties, preventing condensation from penetrating inwards;

• Pressure self-locking: After molding, the internal stress of the material continuously acts on the contact interface, maintaining a long-term sealed state.

Long-term protection of conductor contact surfaces

During the installation of single bolt parallel groove connector clamps, conductive grease containing copper and silver ions is usually applied to the conductor surface to prevent the oxide layer from oxidizing again at crack points. The molding process goes a step further: the conductive grease is sealed within a sealed cavity, preventing loss due to rain or moisture replacement, thus ensuring its anti-oxidation effect continues throughout its entire lifespan.