B30.3 applies to construction tower cranes and permanently mounted tower cranes, powered by electric motors or internal combustion engines, and any variations thereof which retain the same fundamental characteristics. The scope includes cranes of the above types that adjust operating radius by means of a boom (jib) luffing mechanism, or by means of a trolley traversing a horizontal boom (jib), or by means of a combination of the two. Construction tower cranes and permanently mounted tower cranes may be mounted on fixed or traveling bases. Additional mounting means for construction tower cranes may include arrangements that permit the crane to climb in the structure being built, or that permit increasing the tower height as the structure rises and utilizing braces attached to the host structure as needed.

The requirements of this volume are applicable only to cranes when used in lifting work. Mobile crane tower attachments (refer to ASME B30.5) and self-erecting mobile tower cranes are not within the scope of this volume.

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