(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
