Example: A worker lifts 15 kg boxes from the table to the shelf five times an hour. Notice that there is a barrier between the worker and the box.
To calculate the recommended weight limit (RWL) for the task:
Weight - 15 kg
H (Horizontal Distance) - 50 cm
V (Vertical Distance) - 75 cm
D (Lifting/ carrying Distance) - 40 cm
F (Frequency) - 12 min
A (Angle) - 0°
C (Coupling/quality of grip) - fair
23 Kg x 0.50 x 1.00 x 0.95 x 1.00 x 1.00 x 1.00 = 10.9 kg
The weight of the load is 15 kg. This value is higher than the weight limit of 10.9 kg.
Therefore, the TASK IS DANGEROUS.
The critical component is H, the horizontal distance of the box from worker's body.
23 kg x 0.80 x 1.00 x 0.95 x 1.00 x 1.00 x 1.00 = 17.5 kg
The weight of the load at 15 kg is now lower than the recommended weight limit of 17.5 kg.
Therefore, MOST WORKERS CAN SAFELY PERFORM THE TASK.
Document confirmed current on October 1, 2010
Document last updated on April 8, 2008
Copyright ©1997-2015 Canadian Centre for Occupational Health & Safety