1 For delicate work (e . g . drawing) it is desirable to support the
elbow to help reduce static loads in the muscles of the back .
A good working height is about 50-100 mm ab ove elbow
height.
2 During manual work an operator often needs space for tools ,
materials and containers of various kinds , and a suitable height
for these is 1 00-150 mm below elbow height .
3 During standing work , if it involves much effort and makes use
of the weight of the upper part of the body (e . g . woodworking
or heavy assembly work), the working surface needs to be
lower ; 150--400 mm below elbow height is adequate .
Recommended working heights when standing are set out in
Figure 5 . l .