The ISO standard 4301-1:1988 and FEM rule 9.511/86 make is possible to classify electric rope hoists based on their use and the parameters necessary for determining the limits of use are the following:
This is determined by the heaviest load to be lifted (The nominal lifting capacity of the hoist must be ≥ the actual lifting capacity - Lifting capacity = kg)
The state of stress is evaluated considering the average entity of the loads lifted and is ascribable to one of the four spectrums load
3rd - AVERAGE DURATION OF DAILY OPERATION
For LIFTING operations the average duration of operation is calculated as follows:
C/h : N° of complete ascents and descents carried out in one hour
Rt : Hoisting running time in whole day
S : Hoisting Speed