25KN Tandem Sheave Stringing Block for LGJ300-500 Simultaneous Bundle Pull Conductor Stringing

Tandem Sheave Stringing Block for Bundle Conductor Installation

Bundle conductors are pulled as a group, not one sub-conductor at a time. This tandem block holds two sheaves side by side at a fixed spacing, so both sub-conductors of a bundle pass the same tower support point together and arrive at the same tension.

Product Overview

Each sheave runs on its own sealed bearing, which means one sub-conductor cannot drag the other and each keeps a smooth, independent path. The frame is sized for LGJ300-500 and rated 25KN, with aluminium sheaves for wear resistance or nylon sheaves where the conductor surface must be protected.

Design Features and Field Benefits

• Simultaneous Pull for the Whole Bundle: Both sub-conductors are installed in one operation, which cuts stringing time and reduces the number of high tension pulls the crew must supervise.
• Fixed Spacing Matches the Line Design: Sheave spacing is set on the frame, so the bundle geometry stays correct without spacers being measured on site.
• Independent Bearings Prevent Drag: Each sheave turns freely on its own bearing, so neither conductor is abraded by a sheave that is being driven by the other.
• Built for LGJ300-500: The 25KN frame and sheave grooves are sized for large conductors used on high capacity transmission lines.

Tandem sheave block models

Dimensions and ratings are nominal. Confirm the exact model against the datasheet before ordering.

Selection Guidance

• Confirm the bundle spacing and number of sub-conductors; custom spacing is available for project orders.
• Use nylon sheaves where the conductor surface must not be marked.
• Check that the tensioner can hold both sub-conductors at equal tension during the pull.

Typical Applications

• Bundle conductor installation
• High voltage transmission line construction
• Reconductoring with bundled cable
• Long span pulls

Frequently Asked Questions

Quality Control and Delivery

Units are assembled in an ISO 9001 certified workshop. Frames are checked for sheave alignment and axle straightness, load bearing parts are inspected before assembly, and finished units are function checked before packing. Export packing is a plywood case with a moisture barrier, and a 12 month warranty covers manufacturing defects. Inspection records and, on request, third party load test certificates can be supplied with the shipment.

For project specific configurations, drawings or inspection requirements, send the conductor size, rated load and destination port with your enquiry.