A. Hoists & Lifting Equipment
Load Capacity
load capacity, rated load, stage hoist capacity
What is a Load Capacity?
Load capacity (also called rated load or rated capacity) is the maximum weight a lifting device or rigging system is designed to safely carry during normal operation. It is the fundamental specification that determines what can be hung from a hoist, batten, or rigging point.
How It Works
Load capacity is calculated by the manufacturer based on motor power and gearbox ratio, wire rope or chain breaking strength, structural integrity of all load-bearing components, and the applicable safety factor (typically 8:1 to 10:1 for stage machinery). Formula: Safe Working Load (SWL) = Minimum Breaking Load ÷ Safety Factor.
Key Concepts
Rated LoadMaximum designed operating load
Safe Working Load (SWL)Maximum load under defined conditions
Breaking LoadLoad at which component failure occurs
Dynamic LoadAdditional forces during acceleration/deceleration
Static LoadLoad when the system is stationary
Related Standards
- EN 17206:2021 — Load capacity requirements and testing
- WH/T 35-2022 — Chinese standard definitions for rated load