5KN Three Sheave Stringing Block with Nylon Sheave for Three Conductor Bundle Pulling

Three Sheaves Stringing Block for Bundle Conductor Installation

Pulling three conductors one at a time triples the setup work and makes it hard to keep tension equal across the bundle. This three sheave block pulls all three in a single pass, with fixed sheave spacing that holds the designed bundle geometry from the first metre to the last.

Product Overview

Three nylon sheaves are mounted on one axle in a compact steel frame weighing 2.8KG. Nylon gives a smooth, low friction surface that will not score aluminium strands, and the fixed spacing keeps the sub-conductors parallel so sag and electrical clearance stay within design limits.

Design Features and Field Benefits

• One Pass for Three Conductors: A single coordinated pull installs the full bundle, cutting stringing time and the number of high tension operations the crew is exposed to.
• Fixed Spacing Keeps the Bundle in Shape: Sheaves are positioned at the design spacing on a common frame, so sub-conductors stay parallel and do not twist or cross during the pull.
• Nylon Sheaves Protect Aluminium: The nylon groove is smooth and slightly yielding, which reduces surface marking on aluminium and avoids the sharp contact that steel can produce.
• Light Frame for Hand Handling: At 2.8KG the block is easy to lift and hang, which speeds up changes between spans.

Three sheaves bundle block

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

Selection Guidance

• Confirm the bundle spacing required by the line design; the frame spacing is fixed.
• Use a tensioner setting that keeps all three conductors equally tensioned during the pull.
• Inspect sheaves for groove wear after every few spans.

Typical Applications

• Three conductor bundle installation
• Distribution and sub-transmission stringing
• Reconductoring with bundled cable
• Parallel service drop 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.