ULS - UL 551
Standard for Transformer-Type Arc-Welding Machines
|Publication Date:||24 April 2009|
Transformer-Type Arc-Welding Machines
1.1 These requirements cover limited duty welding and cutting power sources, wire feeders, torches, and electrode holders that are intended for use by a layperson in a nonindustrial setting in accordance with the National Electrical Code, NFPA 70. Products covered by these requirements include only those welding products rated 600 volts or less, and are commonly known as hobby welders.
1.1 revised effective July 15, 2009
1.2 These requirements do not cover motor-generator sets or rectifier- or resistance-type welding machines. These requirements do not cover industrial or professional use welders.
1.2 revised effective July 15, 2009