Rigging and sling angle calculations
CHST written lesson, 10 min read. CHST Domain 1: Hazard and Risk Identification and Control
AI-drafted from the cited rules and fact-checked against them. Study aid, not site-specific safety advice. The official rule controls.
What you'll learn
- Calculate the load angle factor from sling length and vertical height
- Find leg tension for a 2-leg bridle at 60, 45 and 30 degrees
- Explain why only two legs are assumed to carry the load
- State the 30-degree minimum horizontal sling angle
- Apply the choker hitch capacity reduction for the angle of choke
What this lesson covers
Sling angles multiply the stress on every leg, and a choker hitch loses capacity as it tightens. This lesson teaches the load angle factor, leg tension at 60, 45 and 30 degrees, the two-leg assumption and choker reductions, the numbers the exam tests and the rigging plans they check.
This lesson is included with a pass
Written lessons come with every CHST pass, along with the video lessons, the question bank, mocks and the tutor. $80 per exam or $143 for all three, for 180 days.
Try the free rigging and sling calculations practice questions