These requirements cover open or enclosed equipment that supplies power to control a motor or motors operating at a frequency or voltage different than that of the input supply. These requirements also cover power-supply modules@ input/output modules@ Silicon Controlled Rectifier (SCR) or Transistor output modules@ dynamic braking units@ and input/output accessory kits for use with power conversion equipment. This equipment is for use in ordinary locations in accordance with Articles 430 and 440 of the National Electrical Code@ NFPA 70. These requirements cover devices rated 1500 volts or less. Equipment intended for use in hazardous locations as defined by the National Electrical Code@ NFPA 70@ shall be evaluated to the Standard for Industrial Control Equipment for Use in Hazardous (Classified) Locations@ UL 698.
UL 508C BULLETIN-2007 history
2018UL 508C BULLETIN-2018 UL Standard for Safety Power Conversion Equipment (COMMENTS DUE: April 16@ 2018)
2013UL 508C CRD-2013 UL Standard for Safety Power Conversion Equipment - Section/Paragraph Reference: New Section - Service Equipment Use Subject: Drives to be used in the service entrance section of installation (Edition 3: May 03, 2002)
2012UL 508C CRD-2012 UL Standard for Safety Power Conversion Equipment - Section/Paragraph Reference: 56.7 Subject: Marking requirements for drives complying with 20.1.11 b) or c) (Edition 3: May 03@ 2002)
2010UL 508C CRD-2010 UL Standard for Safety Power Conversion Equipment - Section/Paragraph Reference: New Section 69 Subject: Modular Drive System Requirements (Edition 3: May 03@ 2002)
2010UL 508C BULLETIN-2010 UL Standard for Safety Power Conversion Equipment (COMMENTS DUE: March 29@ 2010)
2009UL 508C BULLETIN-2009 UL Standard for Safety Power Conversion Equipment (COMMENTS DUE: NOVEMBER 16@ 2009)