These requirements cover electrical equipment for control of air-conditioning, heating, cooking, refrigeration, and humidity, rated 600 volts or less, to be used in ordinary locations in accordance with the National Electrical Code, NFPA 70. These requirements cover general-use equipment for field-installation and controls intended to be factory installed on or in certain appliances as safety, limiting, or operating controls. These controls respond directly or indirectly to changes in temperature, humidity, or pressure to effect control of equipment or appliance operation. These requirements do not cover low-voltage thermostats, damper controls or similar devices intended for connection only to a low-voltage circuit of limited power supplied by a primary battery or by a Class 2 transformer. An assembly consisting of a line-voltage transformer with a low-voltage secondary incorporated as an integral part of a control, such as a thermostat or a damper control, is considered to be within the scope of these requirements. See 6.1. A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.
UL 873-2007 history
1970UL 873-2015 Temperature-indicating and -regulating equipment
2014UL 873 CRD-2014 UL Standard for Safety Temperature-Indicating and-Regulating Equipment - Section / Paragraph Reference: 74.2@ 74.4 Subject: Clarification of text height for Cautionary Markings (Edition 12: November 16@ 2007)
2014UL 873 BULLETIN-2014 UL Standard for Safety Temperature-Indicating and-Regulating Equipment (COMMENTS DUE: December 22@ 2014)
2013UL 873 CRD-2013 UL Standard for Safety Temperature-Indicating and-Regulating Equipment - Section / Paragraph Reference: 5A.5.3.3 Subject: Exception for MOVs in controls when not utilized for reduced clearances (Edition 12: November 16@ 2007)
2013UL 873 BULLETIN-2013 UL Standard for Safety Temperature-Indicating and -Regulating Equipment (COMMENTS DUE: October 21@ 2013)
2012UL 873 CRD-2012 UL Standard for Safety Temperature-Indicating and-Regulating Equipment - Section/Paragraph Reference: 47A Subject: Abnormal Switching Test - Requirements for controls using electronic triggering techniques@ such as zero-crossing switching@ to control the
2012UL 873 BULLETIN-2012 UL Standard for Safety Temperature-Indicating and -Regulating Equipment (COMMENTS DUE: July 09@ 2012)
2010UL 873 CRD-2010 UL Standard for Safety Temperature-Indicating and -Regulating Equipment - Section / Paragraph Reference: 29, 38, 69 Subject: Requirements for controls incorporating equipment ground-fault protection intended for use in fixed outdoor electric deicing and s
2009UL 873 BULLETIN-2009 UL Standard for Safety Temperature-Indicating and -Regulating Equipment (COMMENTS DUE: August 24@ 2009)
2008UL 873 CRD-2008 UL Standard for Safety Temperature-Indicating and -Regulating Equipment - Section / Paragraph Reference: Section 12, Paragraph 12.3 Subject: Reset Mechanism for Electro-mechanical Limiting Control - test sequence (Edition 12: November 16, 2007)
2007UL 873-2007 UL Standard for Safety Temperature-Indicating and -Regulating Equipment Twelfth Edition