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The main role of downlead clamp​ is to achieve a precise and stable connection between the overhead wires and the terminal equipment. In the terminal link of the transmission line, the wire needs to be transferred from the overhead state to the ground equipment connection. In this conversion process, the downlead clamp needs to continuously withstand the gravity and wind loads of the wire, as well as the stress changes caused by the thermal expansion and contraction of the wire due to changes in ambient temperature.

The preformed downlead clamp​ is a connecting component that allows current to be conducted efficiently and safely. It is mainly used to fix and support the ground conductors in the lightning protection lead-off line or power system, so that the conductors can maintain a stable position during long-term operation and avoid loosening or breaking of the connection due to external forces, environmental corrosion and other factors, so as to ensure the safe operation of the entire power system or lightning protection system.