(g) a lift by a crane, boom truck or hoist, supported on a floating base, that exceeds 90% of rated capacity for the lifting system, (f) a lift in which the length of one or more sling legs changes during a lift, (e) a lift in which the centre of gravity of the load changes during the lift, (d) a lift of a person in a work platform suspended from or attached to a crane or hoist, (c) a tandem lift involving the simultaneous use of more than two cranes, hoists or other pieces of powered lifting equipment, (b) a tandem lift if the load on any one crane, hoist or other piece of powered lifting equipment exceeds 75% of the rated capacity of that crane, hoist or other piece of powered lifting equipment, (a) a lift by a mobile crane or boom truck that exceeds 90% of its rated capacity while it is lifting the load at a load radius of more than 50% of its maximum permitted load radius, taking into account its position and configuration during the lift, "construction material hoist" means a material hoist consisting of a guiding and supporting structure and hoist equipment that is not a permanent part of a building, structure, or other work and that is installed and used during construction, alteration, or demolition to raise and lower materials required for the project "chimney hoist" means a temporary hoist used for transporting personnel or materials during the construction of a chimney or similar structure
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