Covers clock-operated switches that close and open circuits to a load at predetermined intervals. The switching contacts are actuated by a clock-work, a gear-train, hand, electrically-wound spring motors, electric-clock type motors, or equivalent arrangements. These switches are to be rated 600 volts or less and employed in accordance with the National Electrical Code, ANSI/NFPA 70-1984. Does not cover switches incorporating electronic timing circuits or switching circuits without separable contacts.
UL 917 BULLETIN-2003 history
1970UL 917-2016 UL Standard for Safety Clock-Operated Switches
2015UL 917 CRD-2015 UL Standard for Safety Clock-Operated Switches - Section / Paragraph Reference: 43.2@ Table 28.1 (revised)@ 42.7@ Section 29A (new) Subject: Addition of Requirements for the Test Method and Simulated Electrical Loads for Electronic Ballast@ CFL and LED Dr
2015UL 917 BULLETIN-2015 UL Standard for Safety Clock-Operated Switches (COMMENTS DUE: July 3@ 2015)
2013UL 917 BULLETIN-2013 UL Standard for Safety Clock-Operated Switches (COMMENTS DUE: May 27@ 2013)
2012UL 917 CRD-2012 UL Standard for Safety Clock-Operated Switches - Section/Paragraph Reference: 41.2 Subject: Abnormal Switching Test - Requirements for controls using electronic triggering techniques@ such as zero-crossing switching@ to switch the control’s output switchi
2006UL 917-2006 UL Standard for Safety Clock-Operated Switches Fifth Edition