Applies to contractors engaged in the installation, service and/or repair of heavy machinery or equipment at a customer's location which is not covered by another classification (N.O.C.). Millwright work and the service or repair of engines and gas machines is also included. A millwright is a technician who specializes in installing and repairing industrial machinery. Typical customers include, but are not limited to, wood, metal and plastic manufacturing plants, fuel refineries, and mills. Types of machinery installed and repaired includes, but is not limited to, escalators, conveyor systems, printing presses, lathes, mill saws, dairy equipment and wind machines. (Store operations of dairy equipment/supply dealers or wind machine dealers are to be reported separately in classification 6407.) Work contemplated by this classification includes, but is not limited to, the pouring of a concrete pad on which the machinery will be installed, cutting and welding of brackets and mountings, assembling component parts, any incidental electrical connections needed to complete the installation, and calibrating the controls and testing the machinery's operation when done by employees of an employer having operations subject to this classification. Placement of heavy machinery must often be done with cranes or by rigging hoists. This classification also includes the dismantling and removal of machinery and equipment covered by this classification.

Applies to contractors engaged in the installation, service and/or repair of dynamos, electrical generators and turbines at a customer's location. A dynamo is a generator of direct electrical current; a turbine is a mechanism that converts moving fluid into mechanical power. Customers include, but are not limited to, electrical utilities, manufacturing plants, mills, and telecommunications companies. Work contemplated by this classification includes, but is not limited to, preparation of a concrete pad on which the machinery will be installed, cutting and welding of brackets and mountings, assembly of component parts if necessary, any incidental electrical connections needed to complete the installation, and calibrating and testing the machinery's operation when done by employees of an employer having operations subject to this classification. Placement of heavy machinery must often be done with cranes or by rigging hoists. Also included is the dismantling and removal of dynamos, generators and turbines.

This classification excludes the installation of underground overhead power lines and poles by an electric utility company which is to be reported separately in classification 1301; the installation of overhead power lines by a nonelectric utility contractor which is to be reported separately in classification 0509; and the installation of underground power lines by a nonelectric utility contractor which is to be reported separately in classification 0107.

Applies to contractors engaged in maintaining, repairing and installing machinery on a long-term contract basis for customers at the customers' location. Customers include, but are not limited to, manufacturing or chemical plants, petroleum refineries, food processing plants and mills. Work contemplated by this classification includes all routine maintenance and repair of a customer's equipment such as, but not limited to, cleaning, oiling and regularly scheduled maintenance and replacement of machinery or machinery parts, equipment and other mechanical installations that are part of the customer's building when done by employees of an employer having operations subject to this classification.

Applies to contractors engaged in the installation, dismantling, and/or repair of metal playground equipment, portable bleachers or stages, and above ground swimming pools. Playground equipment includes, but is not limited to, swings, monkey bars, merry-go-rounds, and slides. Work contemplated by this classification includes all operations necessary for the erection of metal playground equipment including, but not limited to, boring holes in the ground (usually with an auger) into which the various pieces of equipment will be set in concrete, any incidental cutting, welding, drilling and bolting of the tubular steel components which are usually from one to four inches in diameter, and fastening on the chains, swings, handlebars, sliding surface, platforms, bench seats, or other components. This classification also includes the application of any finish material or paint when done by employees of an employer having operations subject to this classification.

This classification excludes the installation of wood playground equipment which is to be reported separately in classification 0516.

Applies to contractors engaged in the installation, dismantling, service, and/or repair of commercial equipment such as, but not limited to, commercial dishwashing units, bakery and restaurant ovens, stoves, grills, sanitizers, steam tables, car washing equipment, commercial laundry equipment, electric entry doors, dry cleaning equipment, gas pumps, or parimutuel totalizer equipment at horse racing facilities. Work contemplated by this classification includes, but is not limited to, placing and leveling the equipment, any assembly of component parts if necessary, connecting or bolting to the wall or floor, making any necessary incidental plumbing or electrical connections, and calibrating and testing the equipment when done by employees of an employer having operations subject to this classification. Some pieces of equipment in this classification may be large enough that they must be moved and positioned with hoists or cranes. Also included is the dismantling and removal of commercial equipment.