Mass. Gen. Laws ch. 146, § 53
(b) For licensing and temporary permitting purposes, the commissioner of the division of occupational licensure shall classify hoisting machinery by categories, depending on size, weight, common usage, capacity, power source or such other characteristics as the commissioner may find appropriate; provided, however, that at least 1 category shall include cranes and other similar equipment and 1 category shall include excavating equipment.
The commissioner shall adopt rules and regulations under chapter 30A, embodying the classifications of hoisting machinery and establishing criteria and procedures for the issuance, denial, renewal, suspension and revocation of licenses or temporary permits to operate hoisting machinery; provided, however, that a final adjudication that there has been a violation of federal or state occupational safety and health regulations or any other rule adopted by the division of occupational licensure, shall be cause for the denial, suspension or revocation of any license or temporary permit issued under this section. Criteria for issuance of such license shall include, but not be limited to, training and experience requirements appropriate to the categories of machinery for which the license is intended. Criteria for issuance of such temporary permit shall include, but not be limited to, training and experience requirements appropriate to the compact equipment for which the permit is intended.
(d)
(i) has not less than 1 supervisory instructor who holds a license issued by the division of occupational licensure pursuant to this section and who is designated as the responsible person in charge of the hoisting equipment; provided, however, that the supervising instructor is:
(A) on site at all times of operation; and (B) designated as the responsible person in charge of hoisting equipment during that period of operation; and (ii) provides an in-service training program for its instructors.
(i) A training facility that is recognized by the division of apprentice standards and that trains apprentices for the occupation of operating engineer shall be exempt from this section if the facility:
(i) has not less than 1 supervisory instructor who holds a license issued by the division of occupational licensure pursuant to this section and who is designated as the responsible person in charge of the hoisting equipment; provided, however, that the supervising instructor is: