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Strain Clamp
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Strain Clamp

Hardware called strain clamps is used to secure wires and sustain their tension. Tension clamps fall into two categories based on various installation scenarios and structural configurations. There are two types of tension clamps: bolt-type and wedge-type. Both types must be able to bear the entire tensile force applied to the conductor, and the clamp's gripping force must equal or exceed 90% of the conductor's rated tensile strength. After installation, this kind of cord clamp can be taken off and reused. The other is a tension clamp, which serves as a conductor in addition to withstanding the wire's full tensile force.

General Information of Transmission Line Strain Clamp


Aluminum Alloy, Steel


Galvanized Steel

Basic Systems of Transmission Line Strain Clamp

Strain clamps are used to fix conductors and ground wires to insulators or link fittings to tower arms and substation structures. There are two basic systems of strain clamps:

  • Detachable clamps, such as wedge-type tension clamps, thimbles, bolted type tension clamps, which allow for subsequent adjustment.

  • Non-detachable clamps, such as compression dead-end clamps which require absolute matching to the conductor length.

  • The type of strain clamps are including NLL-1, NLL-2, NLL-3, NLL-4 and so on.


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