Bolted Tension Clamps Must Be Tightened To The Specified Torque Value
Proper installation of a bolt-type tension clamp requires calibrated torque wrenches to apply exact manufacturer torque specifications. This precise tightening prevents conductor slippage, eliminates excessive mechanical stress, and maintains stable electrical conductivity across high-voltage overhead distribution lines.
Preparation and Conductor Positioning
Line crews clean conductor surfaces with wire brushes to remove oxide layers before positioning hardware. Placing the conductor into the bolted type strain clamp groove ensures uniform contact along the entire gripping surface without damaging individual aluminum strands.
Installation Sequence
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Aligning a dead end strain clamp requires manual thread engagement prior to mechanical tightening. Installers seat U-bolts or straight bolts evenly to prevent tilting the pressure plate, which causes localized stress points during tensioning.
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Operators set torque wrench indicators to match engineering drawings. Applying force incrementally across diagonal bolt patterns guarantees balanced clamping force. This systematic procedure stops conductor deformation while securing high mechanical tension loads.
Quality Control and Torque Verification
Final inspection demands verifying every fastener on the bolted dead end clamp with a calibrated click-type torque wrench. Marking torqued bolt heads with paint provides immediate visual confirmation that installation standards have been fully satisfied.
Recommended Torque Specifications
Standard torque values depend directly on bolt diameter and steel grade. Following recommended torque settings prevents thread stripping and guarantees optimal retention force under outdoor environmental conditions.
| Bolt Diameter | Thread Pitch | Torque Rating (Nm) | Torque Rating (ft-lb) |
|---|---|---|---|
| M10 | Standard | 35 – 40 | 26 – 30 |
| M12 | Standard | 60 – 65 | 44 – 48 |
| M16 | Standard | 135 – 145 | 100 – 107 |
