Overhead Power Transmission Lines Conductor-Pulling Clamp Strength Test is governed by stringent standards to ensure clamps can safely withstand the mechanical loads during conductor stringing without failure or damage to the conductor.

Key Points on Strength Testing of Conductor-Pulling Clamps:

• Test Types:

  • Visual and Dimensional Inspection: Ensures clamps meet design dimensions, surface finish, and material specifications.

  • Material Verification: Confirms materials such as forgeable aluminum alloy for clamp bodies, hot-dip galvanized steel for straps and bolts, and stainless steel fasteners meet quality requirements.

  • Mechanical Strength Test (Type Test):

    • Clamps are subjected to a Specified Minimum Failure Load (SMFL), typically set at 90% of the rated tensile strength (RTS) of the conductor they are designed for.

    • The clamp must hold the conductor without slippage or deformation up to this load.

    • For example, if the conductor rated strength is 100 kN, the clamp must withstand at least 90 kN without failure.

  • Specified Minimum Mechanical Damage Load (SMMDL): Usually 70% of RTS, clamps must not cause mechanical damage to the conductor at this load level.

  • Fatigue and Endurance Tests: Some specifications require repeated loading cycles to simulate real-world tensioning and ensure durability.