The ACGIH TLV for Low Back Risk - Fundamentals and Assessment Tools for Occupational Ergonomics - page 980

TABLE 50.5 TLVs for Lifting Tasks . 2 h per day with . 12 and 30 Lifts per hour or 2 h per day with . 60 and

360 Lifts per hour

Horizontal Location of Lift

Close Lifts:
Origin

Intermediate Lifts:
Origin 30-60 cm
from Midpoint
between Inner
Ankle Bones

Extended Lifts:
Origin 30 cm

from Midpoint
between Inner
Ankle Bones

, 60 to 80 cm

from Midpoint
between Inner
Ankle Bones a

.

Lifting Height Zone

Reach limit b from
30 cm above to
8 cm below shoulder height

14 kg 5 kg No known safe limit for

repetitive lifing c

Knuckle height d to
below shoulder

27 kg 14 kg 7 kg

Middle shin height to
knuckle height d

16 kg 11 kg 5 kg

Floor to middle shin height 9 kg No known

safe limit for
repetitive lifing c

No known safe limit
for repetitive lifing c

a Lifting tasks should not be started at a horizontal reach distance more than 80 cm from the midpoint between the inner
angle bones (Figure 50.2)
b Routine lifting tasks should not be conducted from starting heights greater than 30 cm above the shoulder or more than
180 cm above floor level (Figure 50.2.)
c Routine lifting tasks should not be performed for shaded table entries marked “No known safe limit for repetitive lifting.”
While the available evidence does not permit identification of safe weight limits in the shaded regions, professional judgment
may be used to determine if infrequent lifts of lifht weights may be safe.
d Anatomical landmark for knuckle height assumes the worker is standing erect with arms hanging at the side.
Source: Reprinted from ACGIH, 2004 Threshold Limit Values for Chemical Substance and Physical Agents & Biological
Exposure Indices, 2004. Cincinnati, OH: ACGIH. With permission.

TABLE 50.6 TLVs for Lifting Tasks 2 h per day with 30 and 360 Lifts per hour.

. .

Horizontal Location of Lift

Close Lifts:
Origin , 30 cm from
Midpoint between
Inner Ankle Bones

Intermediate Lifts:
Origin 30-60 cm from
Midpoint between Inner
Ankle Bones

Extended Lifts:
Origin . 60 to 80 cm
from Midpoint between
Inner Ankle Bones a Lifting Height Zone

Reach limit b from 30 cm
above to 8 cm below
shoulder height

11 kg No known safe limit for

repetitive lifing c

No known safe limit for
repetitive lifing c

Knuckle height d to
below shoulder

14 kg 9 kg 5 kg

Middle shin height to
knuckle height d

9 kg 7 kg 2 kg

Floor to middle shin height No known safe limit for

repetitive lifing c

No known safe limit
for repetitive lifing c

No known safe limit
for repetitive lifing c

a Lifting tasks should not be started at a horizontal reach distance more than 80 cm from the midpoint between the inner
angle bones (Figure 50.2)
b Routine lifting tasks should not be conducted from starting heights greater than 30 cm above the shoulder or more than
180 cm above floor level (Figure 50.2)
c

Routine lifting tasks should not be performed for shaded table entries marked “No known safe limit for repetitive lifting.”
While the available evidence does not permit identification of safe weight limits in the shaded regions, professional judgment
may be used to determine if infrequent lifts of lifht weights may be safe.
d Anatomical landmark for knuckle height assumes the worker is standing erect with arms hanging at the side.
Source: Reprinted from ACGIH, 2004 Threshold Limit Values for Chemical Substance and Physical Agents & Biological
Exposure Indices, 2004. Cincinnati, OH: ACGIH. With permission.