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1.  Service classes have been established to enable the buyer to specify the most economical      carrier (trolley) or crane for the particular installation. To determine proper service      classification equipment, it should be noted that there are three possible basic modes of      operation to be considered. They are travel, carrier (trolley) travel and hoist travel. Specific      requirements are shown for these components where design is influenced by classification. All      classes of cranes are affected by operating conditions; so for the purpose of these definitions,      it is assumed that the crane will be operating in normal ambient temperatures (0o to 100o F)      and normal atmospheric conditions (free from excessive dust, moisture and corrosive fumes).

2.  Class A

     This class is further divided into two subclasses due to the nature of the loads to be handled.

   2.1  Class A1 (Standby Service) – This service class covers cranes used in installations such           as power houses, public utilities, turbine rooms, motor rooms and transformer stations,           where precise handling of valuable machinery at slow speeds with long idle periods           between lifts is required. Capacity loads may be handled for initial installation of           machinery and for infrequent maintenance.

   2.2  Class A2 (Infrequent Use) – These cranes will be used in installations such as small           maintenance shops, pump rooms, testing laboratories, and similar operations where loads           are relatively light, the speeds are slow, and a low degree of control accuracy is required.           The loads may vary anywhere from no load to full capacity with a frequency of a few lifts a           day or month.

3.  Class B (Light Service)
     The service covers cranes such as those used in repair shops, light assembly operations,      service buildings, light warehousing, etc. where service requirements are light and the speed      is slow. Loads may vary from no load to full-rated load with average load of 50% of capacity      with 2 to 5 lifts per hour and averaging 15 feet, with no more than 50% of the lifts at rated      capacity.

4.  Class C (Moderate Service)
     This service covers cranes such as those used in machine shops, paper mill machine rooms,      etc., where the service requirements are moderate. In this type of service the crane will      handle loads, which average 50% of the rated capacity with 5 to 10 lifts per hour and      averaging 15 feet, with no more than 50% of the lifts at rated capacity.

5.  Class D (Heavy Duty)
     This service covers cranes, usually cab-operated, such as those used in heavy machine      shops, foundries, fabricating plants, steel warehouses, lumber mills, etc., and standard duty      bucket and magnet operation where heavy-duty production is required but specific cycle of      operation. Loads approaching 50% of the rated capacity will be handled constantly during the      working period. High speeds are desirable for this type of service with 10 to 20 lifts per hour      averaging 15 feet, with no more than 65% of the lifts at rated capacity.

6.  Class E & F (Severe Duty & Steel Mill Service) Cranes in E & F class are covered by the      current issue of The Association of Iron and Steel Engineers’ Standard No. 13 for Electric      Overhead Traveling Cranes for Steel Mill Service.