Three Sheaves Stringing Block Professional Cable Pulling Equipment For Power Grid Construction

Core Design Features​​

• ​​Triple-sheave configuration​​ with 120° angular spacing for optimal conductor alignment
• ​​Forged alloy steel frame​​ with zinc-nickel alloy coating (50μm thickness)
• ​​Sealed ball bearings​​ with automatic lubrication ports (IP66 rating)
• ​​Working Load Limit (WLL):​​ 8-32 tons (tested to 4:1 safety factor per ASME B30.26)
• ​​Conductor compatibility:​​ 12mm-60mm diameter (ACSR/AAAC/ACCC/TACSR)
• ​​Integrated anti-derailment guards​​ for all sheave grooves

​​Operational Advantages​​
✔ ​​40% faster stringing speed​​ compared to dual-sheave blocks
✔ ​​3-point contact system​​ prevents conductor twisting during pulls
✔ ​​Reduced fleet angle​​ (<2°) minimizes conductor surface wear
✔ ​​Quick-change sheave system​​ (tool-free replacement in <5 minutes)
✔ ​​Modular design​​ allows adding grounding rollers as optional accessories

​​Safety Certifications​​
✓ ​​IEEE 524-2020​​ compliant for conductor installation
✓ ​​OSHA 1910.269​​ certified for live-line work
✓ ​​EN 13414-1:2020​​ load testing certification
✓ ​​Non-magnetic stainless steel hardware​​ for substation environments
✓ ​​Dual-locking swivel hook​​ with 360° rotation capability

​​Maintenance Specifications​​
• ​​Self-cleaning sheave grooves​​ with UHMWPE liners (replaceable)
• ​​Magnetic particle inspected​​ load-bearing components
• ​​Corrosion warranty:​​ 5 years in coastal environments (C5-M class)
• ​​RFID tracking tag​​ embedded in frame for asset management
• ​​3D-printed spare parts​​ program available

​​Typical Applications​​
➔ ​​±800kV UHV DC line construction​​
➔ ​​Bundle conductor stringing (4x/6x/8x)​​
➔ ​​Transposition tower section pulls​​
➔ ​​Submarine cable landing operations​​
➔ ​​High-altitude (>3000m) line projects​

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​​Optional Accessories​​

• ​​Fiber-optic cable guide attachments​​
• ​​Real-time load monitoring system (BLE 5.0)​​
• ​​Arctic-grade lubricant kit (-50°C rated)​​
• ​​Explosion-proof version (ATEX Zone 1)​​