How To Install Bolt-type Tension Clamps To Prevent Improper Stress?

Improper stress during overhead line installation causes premature cable fatigue and costly network failures. This guide provides a precise, step-by-step technical methodology for installing a bolt-type tension clamp to eliminate uneven stress distribution and maximize mechanical hold.

So how should bolt-type tension clamps be installed to avoid improper stress

To install a bolted type strain clamp without creating improper stress, technicians must maintain precise conductor alignment, follow a staggered tightening sequence, and apply the exact manufacturer-specified torque. Keeping the conductor straight prevents uneven bending stress, while a calibrated torque wrench ensures uniform gripping pressure across all keeper pieces without crushing the wire.

Installation Steps

1. Conductor Preparation and Alignment

Clean the conductor thoroughly with a wire brush to remove oxide layers. Apply a high-quality joint compound to prevent moisture ingress. Align the wire perfectly straight before placing it into the groove of the dead end strain clamp to avoid localized bending stress.

2. Positioning the Keeper Plates

Place the keeper plates evenly over the conductor. Ensure the conductor seats fully in the bottom of the groove. Misalignment at this stage introduces asymmetric mechanical loads, which severely reduces the holding strength of the bolted dead end clamp under tension.

3. Staggered Torque Application

Do not tighten bolts sequentially from one end to the other. Tighten them in a progressive, crisscross pattern. Apply torque in three distinct increments (30%, 60%, and 100%) until reaching the target value specified in the technical data sheet.

Installation Specifications

The following parameters ensure optimal mechanical performance and prevent conductor deformation during the clipping-in process:

Verification Inspection

Measure the torque on every bolt after the final pass to account for material relaxation. Visually check that the gap between the clamp body and the keeper plates remains uniform on both sides, confirming balanced pressure distribution.