Multi-Leg Sling Load per Leg
The tension in each sling leg of a multi-leg lift: per ASME B30.9, a rigid load on 3 or more legs is assumed to hang from only 2, so the conservative tension divides the load over 2 legs and then by sin(angle from horizontal), with an equal-share reference and the 1/sin load factor. The qualified rigger and the sling tag govern.
Formula and source
share_legs = (num_legs >= 3) ? 2 : num_legs; tension_per_leg = (total_load / share_legs) / sin(angle); load_factor = 1/sin(angle); equal-share reference = (total_load / num_legs) / sin(angle).
ASME B30.9 (Slings) by section; classical sling statics, no edition cycle.
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