As per Indian Standard Specifications 807 and 3177 Cranes have basically divided into four Classes.
Class - I Light Duty
These are normal maintenance cranes which are not constant use. Cranes for periodical maintenance of plant and machinery come under this category. These type of cranes are required for maximum 1000 working houses per annum. Their speed are slow and the structures are light.
Class - II Medium Duty
This class perhaps covers the largest number of cranes used by the industry, in workshop, Foundries, Processing plants, important ware-houses and infact every area where are fair degree of activity exists. These cranes are designed for maximum 2000 working hours per annum.
Class - III Heavy Duty

As per Indian Standard Specifications 807 and 3177 Cranes have basically divided into four Classes.
Class - I Light Duty
These are normal maintenance cranes which are not constant use. Cranes for periodical maintenance of plant and machinery come under this category. These type of cranes are required for maximum 1000 working houses per annum. Their speed are slow and the structures are light.
Class - II Medium Duty
This class perhaps covers the largest number of cranes used by the industry, in workshop, Foundries, Processing plants, important ware-houses and infact every area where are fair degree of activity exists. These cranes are designed for maximum 2000 working hours per annum.
Class - III Heavy Duty