Key Components of Safe Rigging Practices

March 25, 2025

This information is the result of a presentation at WUCA's Safety & Insurance Committee Meeting by Sal Proite of Superior Lifting Specialists, Inc. These notes are not intended to be comprehensive and we would recommend specific training on the equipment you utilize.


Thorough Equipment Inspection

Before any lifting operation, inspect all rigging equipment meticulously:

  • Slings and Hardware: Ensure they are free from defects and have legible identification tags.
  • Nylon Slings: Look for tears, frayed threads, or knots, which can compromise strength.
  • Chain Slings: Check for elongation and ensure hammerlocks pivot correctly.
  • Hooks (e.g., Crosby Hooks): Inspect for visible bends, twists, or open clips. Ensure the load point is centered to prevent latch failure.


If any equipment lacks proper identification or shows signs of wear, remove it from service immediately. Some items can be repaired and retagged, but always assess the cost-effectiveness and safety implications of repairs versus replacements.


Accurate Load Weight Assessment

Understanding the weight of the load is crucial:

  • If the weight is unknown, halt operations until accurate information is obtained through documentation or consultation.
  • Ensure the load's center of gravity is directly beneath the top suspension point to minimize swinging or shifting during lifts.


Proper Sling Angle Utilization

The angle at which slings are attached affects their load-bearing capacity:

  • Two slings at a 90-degree angle can support up to 200% of the sling's rated capacity.
  • At a 60-degree angle, the capacity reduces to 100% of the sling's rating.
  • Always calculate and adjust sling angles to maintain safe load limits.


Adherence to OSHA Standards

Compliance with OSHA regulations is mandatory:

  • Inspection Requirements: Rigging equipment must be inspected before each shift and during use as necessary to ensure safety.
  • Identification Markings: Equipment must have permanently affixed and legible identification markings indicating the safe working load.
  • Load Limits: Never exceed the recommended safe working load as prescribed by the manufacturer.


Additionally, for underground construction, OSHA's 29 CFR 1926.800 outlines specific safety measures, including the prohibition of employees working under suspended loads and the requirement for pre-planned suspended load routes to keep employees clear of hazards. OSHA


Conclusion

Rigging in underground construction demands meticulous planning, rigorous equipment inspection, and strict adherence to safety protocols. By implementing these best practices, contractors can significantly reduce the risk of accidents, ensuring the safety of their workforce and the success of their projects.

By Ruth Hackney May 14, 2026
We’re excited to share a new, ready-to-use recruitment flyer designed specifically for WUCA members and their workforce development efforts. This piece highlights the powerful story behind underground and utility construction—careers that build and sustain thriving communities. Using clear data, strong visuals, and compelling messaging, the flyer showcases key advantages of our industry, including “earn while you learn” opportunities, competitive wages, long-term stability, and meaningful career growth. Just as importantly, it emphasizes what makes our work unique: building the essential infrastructure that delivers water, energy, and connectivity to Wisconsin communities every day. This tool was created with flexibility in mind and can be used at career fairs, school visits, job sites, and community events. It’s designed to resonate with students, career changers, and anyone looking for a stable, purposeful career path. We encourage all member contractors to take advantage of this resource—customize it with your company information, add a QR code or contact details, and put it to work in your recruiting efforts. Together, we can strengthen the pipeline of skilled professionals and continue building the future—below the surface. For access to the flyer and additional recruitment resources, visit wuca.org.
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November 5, 2026 WBC Park, Home of the Lake Country DockHounds 1011 Blue Ribbon Circle N. Oconomowoc, WI. 53066 WUCA's Make‑A‑Wish: All‑Star Evening brings our community together at Dockhounds Stadium for a meaningful night in support of Make‑A‑Wish Wisconsin. Enjoy food, drinks, entertainment, and exciting silent and live auctions—all while helping grant life‑changing wishes for children facing critical illnesses. Together, we can step up to the plate and make hope possible. To donate, please contact Ruth at rhackney@wuca.org or 262-259-2085. About Make-A-Wish : The Make-A-Wish Foundation is a beacon of hope and joy for children facing critical illnesses and their families. Dedicated to granting the wishes of these courageous children, the foundation believes in the transformative power of a wish come true. From meeting their favorite celebrity to experiencing thrilling adventures or traveling to dream destinations, Make-A-Wish creates magical moments that provide respite from the challenges of illness and instill a sense of hope and strength. With the support of donors, volunteers, and community partners, Make-A-Wish has touched the lives of countless children worldwide, bringing smiles, laughter, and cherished memories during some of life's toughest battles.
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