to safety laws, standards, rules and regulations. The inspectors of this division are also responsible for the safe operation of amusement rides, horse and carriage vehicles, and bungee jumping. In addition to ensuring compliance with safety laws, rules and regulations, it is the responsibility of the inspectors to examine people for the following licenses: Power plant engineers and firemen, oil burner technicians, refrigeration technicians, heavy equipment and hoisting operators, sprinkler fitters, pipe fitters, nuclear power plant operators. Trenches In addition to the permit and local permitting authority requirements mandated by statute, the trench safety regulations require that all excavators, whether public or private, take specific precautions to protect the general public and prevent unauthorized access to unattended trenches. Accordingly, unattended trenches must be covered, barricaded or backfilled. Licensing The Department of Public Safety issues licenses in the following areas: Amusement and Entertainment, Architectural Access Board, Change of Address Form, Concrete Field Testing Technician, Construction Supervisor License, Elevators, Engineers, Hoisting, Inspector of Pressure, Vessel License, Native Lumber Producers, Nuclear Plants, Oil Burners, Pipe Fitters, Public Warehouse, Refrigeration, S-License (Security), Sprinklers, Tramways, Inspection Applications, and Ticket Resellers. Notes Further reading External links . (Various documents). Government of Massachusetts