(1) It has registered capital and business scope suitable for the qualification category and qualification grade it applies for;
(2) Having necessary managers, professional technicians and skilled workers;
(3) Having a fixed business place and qualified maintenance equipment and facilities;
(four) the newly established maintenance and installation enterprises, after one year of operation, can declare all kinds of corresponding grade qualifications; Enterprises applying for qualification upgrading must obtain the corresponding level of qualification for more than one year before applying for a higher level of qualification. Anyone who applies for all kinds of special enterprise qualifications must obtain the corresponding first-class qualifications for more than three years.