Table 2.
Recommended Weight Lift Limits (RWL) in pounds, by arm position and starting lift height according to the Revised National Institute of Occupational Safety and Health Lifting Equation (1). For all calculations, Asymmetry Multiplier (AM) = 0.86; Frequency Multiplier (FM) = 0.84; Coupling Multiplier (CM) = 0.90.
| Lift starting below cart opening height |
Lift starting at cart opening height |
Lift starting above cart opening height |
|||||
|---|---|---|---|---|---|---|---|
| Vertical distance (VD) and Lift distance (LD) (inches) |
VD | LD | VD | LD | VD | LD | |
| 20 | 20 | 35 | 5 | 50 | 10 | ||
| Vertical Multiplier (VM) and Distance Multiplier (DM) |
VM | DM | VM | DM | VM | DM | |
| 0.93 | 0.91 | 0.96 | 1.00 | 0.85 | 1.00 | ||
| Arm position during lift | Horizontal Multiplier (HM) |
Recommended Weight Lift Limit (pounds) |
|||||
|
Position 1 Bag held as close to the body as possible (HD = 10 inches) |
1.00 | 28 | 32 | 28 | |||
|
Position 2 Bag held in mid-position, elbows slightly bent (HD = 17 inches) |
0.59 | 17 | 19 | 17 | |||
|
Position 3 Bag held maximally away, elbows extended (HD = 25 inches) |
0.40 | 11 | 13 | 11 | |||