UL 60745-2-2 (ND)-2004 UL 60745-2-2手持式电动工具的国家差异. 安全性. 第2-2部分: 改锥和冲击扳手的特殊要求 (第二版; 通过和包括2014年10月31日的修订再版)
National Differences For UL 60745-2-2 Hand-Held Motor-Operated Electric Tools - Safety - Part 2-2: Particular Requirements for Screwdrivers and Impact Wrenches (Second Edition; Reprint with Revisions Through and Including October 31@ 2014)