适用于电动自立塔式起重机的施工、操作、检查、测试和维护，该起重机通过小车横穿起重臂来调整工作半径。它们可以是水平的、升高的、铰接的或伸缩的，用于垂直提升和降低由设备和材料组成的自由悬挂的非导向负载。自架设塔式起重机具有垂直或接近垂直的桅杆，其底部回转并安装在固定、移动或移动基座上。起重机能够在完全组装或几乎完全组装的情况下从一个工作现场移动到另一个工作现场。本卷不适用于用于非垂直提升服务或提升导向负载和卡车的起重机- 装有管状臂架和横穿臂架的小车的物料输送起重机。塔式起重机（参考ASME B30.3）和移动式起重机塔架附件（参考ASME B30.5）不在本卷范围内。

Applies to the construction, operation, inspection, testing and maintenance of powered, self-erect tower cranes, which adjust operating radius by means of a trolley traversing a jib. These may be horizontal, elevated, articulating, or telescoping, used for vertical lifting and lowering of freely suspended, unguided loads which consist of equipment and materials. Self-erect tower cranes have vertical or nearly vertical masts that are bottom slewing and mounted on fixed, traveling, or mobile bases. The cranes are capable of moving or being moved from jobsite to jobsite fully assembled or nearly fully assembled. This volume does not apply to cranes used for non-vertical lifting service or lifting a guided load and truck-mounted material delivery cranes with a tubular boom and trolley traversing the boom. Tower cranes (refer to ASME B30.3) and mobile crane tower attachments (refer to ASME B30.5) are not within the scope of this volume.