The manufacturer of Cummins 60KW generator accessories can request a common chassis with daily fuel tanks to reduce pipelines and occupied area. For other considerations, it is also possible to select 2 units in parallel for power supply. Generally, the number of emergency generating sets should not be 3. When multiple units are selected, the unit should try to select complete sets of equipment of the same type and capacity, near the characteristics of pressure regulation and speed regulation, and the nature of the fuel used should be the same for repair and maintenance and sharing of spare parts.