UL - 60745-2-2 CRD
UL Standard for Safety Hand-Held Motor-Operated Electric Tools – Safety – Part 2-2: Particular Requirements for Screwdrivers and Impact Wrenches - Section / Paragraph Reference: 1, 3.103, 12.4, 17.2, 24.4, K.12.1, L.12 Subject: Ratchet Drivers
|Publication Date:||8 July 2013|
This standard applies to screwdrivers, and impact wrenches and ratchet drivers. 3.103 ratchet driver: Tool intended for tightening and loosening screws, nuts, and the like and equipped with a ratcheting mechanism. Some ratchet drivers are equipped with a means for switching the direction of rotation.
The tool is operated intermittently for 30 cycles, or until temperatures stabilise, whichever is achieved first, each cycle comprising a period of continuous operation of 30 s and a rest period of 90 s with the tool switched off, the tool loaded during the periods of operation by means of a brake adjusted so as to attain rated input or rated current. The temperature rises are measured at the end of the ²ON² period. At the manufacturers option the tool may be operated continuously until thermal stabilisation.
The impact or ratchet mechanism may be disabled during the test to prevent damage to the brake.