UL 244A:2003 pdf download Solid-State Controls for Appliances
1 Scope
1.1 These requirements cover component electronic controls intended to be factory installed on or inappliances and other utilization equipment rated 600 V or less, used in ordinary dry locations as definedin the National Electrical Code, NFPA 70, and that comply with the requirements for such appliances andequipment.
1.2 For a control covered by this standard, it is assumed that:
a) No voltage greater than 600 V above ground will be present in a control
b) An isolation transformer, if provided, will generally furnish power at a lower potential than theprimary voltage,and
c) The output of the control will not be located in a circuit operating at greater than 600 Vabove ground in the end-use product.
if conditions other than these are provided, consideration shall be given to the need for additionarequirements.
1.3 A control covered by this standard is a single device or a series of separate components withinterconnecting wiring employing one or more input power and possibly signal ports, solid-state circuitry.and one or more output switching components to directly control al or a portion of the end-use productload. Included are controls that respond directly or indirectly to changes in temperature, humidity, orpressure to aftect operation of an appliance, function as an electronic timer, or electronically store orprocess information by virtue of a memory system.
1.4 These requirements cover controls intended for connection only to a low-voltage circuit of limitedpower supplied by a primary battery or by a Class 2 transformer, where a failure of such a control wouldresult a risk of fire, electric shock, or injury to persons in the end-use product.
1.5 These requirements do not cover a control intended for installation in or on refrigeration or airconditioning equipment that is used in industrial applications or in hazardous locations as defined in theNational Electrical Code, NFPA 70. Such equipment is covered in the Standard for Temperature-Indicating and -Regulating Equipment, UL 873. Compliance with the Standard for Automatic ElectricaControls for Household and Similar Use, Part 1: General Requirements, UL 60730-1, and/or the applicablePart 2 standard from the UL 60730 series fulfills these requirements.
1.5 revised March 4, 2010. UL 873 will be withdrawn on October 19, 2016.
1.6 These requirements do not cover controls for use where exposed to oil, grease vapors, lint, othercontaminants, or high humidity in the end application.
1.7 These requirements address the potential risks unique to the electronic nature of a control. Equipmentor components employing an electronic feature shall also comply with the basic requirements containedin the applicable end-product or component standard. These requirements are intended to supplementapplicable end-product or component standards and are not intended to serve as the sole basis forinvestigating al risks associated with a control. For example, requirements for the means of enclosing liveparts, mechanical assembly of components, corrosion protection, use of polymeric materials, evaluationof internal wiring and connections within the control calibration, and similar requirements, are not includedin this standard.