UL-551 › Standard for Transformer-Type Arc-Welding Machines
Included in this current edition are the following subparts:
8TH EDITION - April 24, 2009
CHANGE 07/09 - July 15, 2009
CHANGE 12/09 - Dec. 31, 2009
CHANGE 06/11 - June 23, 2011
CHANGE 10/13 - Oct. 29, 2013
CHANGE 11/13 - Nov. 19, 2013
CHANGE 01/03/18 - Jan. 3, 2018
CHANGE 01/08/18 - Jan. 8, 2018
CHANGE 06/22 - June 2, 2022
CHANGE 07/09 - July 15, 2009
CHANGE 12/09 - Dec. 31, 2009
CHANGE 06/11 - June 23, 2011
CHANGE 10/13 - Oct. 29, 2013
CHANGE 11/13 - Nov. 19, 2013
CHANGE 01/03/18 - Jan. 3, 2018
CHANGE 01/08/18 - Jan. 8, 2018
CHANGE 06/22 - June 2, 2022
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Document Number
UL-551
Revision Level
8TH EDITION
Status
Current
Publication Date
April 24, 2009
Page Count
58 pages