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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 equals 15 kg
H (Horizontal Distance) - 50 cm
V (Vertical Distance) - 70 cm
D (Lifting/Carrying Distance) - 40 cm
F (Frequency) - 12 min
A (Angle) - 0°
C (Coupling/quality of grip) - fair
The revised NIOSH Lifting Equation is: 23 Kg x HM x VM x DM x AM x FM x CM= RWL
23 Kg x 0.50 x 0.99 x 0.93 x 1.00 x 1.00 x 1.00 = 10.59 kg
The recommended weight is 10.59 kg, which is less than the current weight at 15 kg.
The weight of the load is 15 kg, which is higher than the calculated recommended weight limit of 10.59 kg.
Therefore, this task is likely to increase the risk of a lifting related injury.
The critical component is H, the horizontal distance of the box from worker's body.
The revised NIOSH Lifting Equation is: 23 kg x HM x VM x DM x AM x FM x CM = RWL
23 kg x 0.83 x 0.99 x 0.93 x 1.00 x 1.00 x 1.00 = 17.58 kg
The weight of the load at 15 kg is now lower than the recommended weight limit of 17.58 kg.
Therefore, MOST WORKERS CAN SAFELY PERFORM THE TASK.