(1) Class A (unrestricted) – unrestricted: may operate all cranes including cranes having a fixed lattice boom, with or without free fall capability, conventional tower cranes, derricks and all cranes with free fall capability. Conventional, cable, lattice boom, and friction are names that have been used in reference to this class. A certificate of competence for Class A allows the holder to operate any crane.

(2) Class B (hydraulic) – restricted: may operate all hydraulic cranes which have a telescopic boom and swinging cab with no restriction on maximum manufacturer's rating. This class also includes small trailer or truck mounted self-erecting tower cranes, as well as boom trucks having a manufacturer's rated capacity of over 28 tons. A certificate of competence for Class B allows the holder to operate Class B, C and D cranes.

(3) Class C (boom truck) – restricted: may operate cranes having telescopic booms which are generally truck mounted and up to 28 ton maximum manufacturers' rated capacity. A certificate of competence for Class C allows the holder to operate Class C and D cranes.

(4) Class D (restricted boom truck) – restricted: may operate cranes having telescopic booms which are generally truck mounted and up to three ton maximum manufacturer's rated capacity, and up to 125 feet of boom. These cranes are also referred to as sign hangers, but their use is not restricted to that industry. A certificate of competence for Class D allows the holder to operate Class D cranes only.

(5) Class E – reserved.

(6) Class F (line truck) – restricted: may operate cranes that have up to 15 ton maximum manufacturers' rated capacity, 65 foot maximum boom length, utilize a non-conductive tip with nylon rope, for use in electrical applications only. These cranes are also referred to as digger derricks. A certificate of competence for Class F allows the holder to operate Class F cranes only.