UL 2111-2016 pdf download
UL 2111-2016 pdf download.Overheating Protection for Motors.
3.7 SECONDARY (BACK.UP) PROTECTION – A protector that does not operate under normal running or locked rotor test conditions. without further stress applied to the motor by Increased winding temperature, ambient temperature, or voltage.
3.7.1 SHADED-POLE MOTOR — A single-phase motor with a main winding and one or more short-circuited windings (shaded coils). The motor has no capacitor nor start switch.
3.8 SINGLE-OPERATION DEVICE — A device that InCorporates a bimetal that is calibrated to open the motor Circuit upon reaching a certain temperature and is resettable only by coohng to minus 35°C (minus 31°F). or lower.
3,8,1 SOLID-STATE PROTECTION — Electronic circuitry integral to or provided with a motor to monitor winding temperature andlor current to prevent overheating. The protection is typicaily designed to reset automatically after motor temperatures return to normal condition, but circuitry requiring manual reset does exist.
3.8.2 SPLIT-PHASE MOTOR — A single-phase motor having a main winding and an auxiliary winding, which is designed to operate with no external impedance in either winding. The auxiliary winding is energized only during the starting operation arid is open-circuited during the running operation. The motor has no capacitor, but does have a start switch.
3.9 THERMAL CUTOFF — A device that incorporates a melting alloy or other material that is calibrated to permanently open the motor circuit upon reaching a certain temperature.
3.10 THERMAL-DEVICE-PROTECTED MOTOR — A motor that relies upon a device (protector) to prevent overheating.
3.11 THERMAL PROTECTOR — A device installed integrally within a motor that is responsive to motor current and temperature or temperature only and that, when applied as intended, prevents overheating. Types are: thermal cutoff, automatically reset, manually reset and single-operation.
3.12 TOTAIIY.ENCLOSED MOTOR – A motor that is enclosed to prevent the free exchange of air between the inside and outside of the winding enclosure and not so enclosed as to be airtight.
3A Components
3A.1 A component of a product covered by this standard shall comply with the requirements for that component and shall be used in accordance with its recognized rating and other limitations of use. See Appendix A for a list of standards covering components used in the products covered by this standard.
3A2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or
b) Is superseded by a requirement in this standard.
17 General
17.1 A thermal cutoff shall comply with the requirements in the Standard for Thermal-Links — Requirements and Application Guide, UL 60691, in addition to the requirements of this standard.
17.2 Insulation for a prOtector intended for use in a Class A or Class B insulated motor shall be:
a) 1/32 Inch (0.8 mm) 10.028 Inch (0.7 mm)) minimum thickness treated fiber; b) 0.004 inch (0.1 mm) minimum thickness po’yethylene terepthalate (PEW); c) 0.015 inch (0.4 mm) minimum thickness silicone-impregnated fiberglass:
d) 0.017 inch (0.4 mm) minimum thickness isocyanate-resin-impregnafed fibeglass; or e) 0.006 inch (0.152 mm) minimum thickness aramid paper.
Exception: Other matenals are capable ol being used when they comply with the protector insulation test requirements in the Protector Insulation Test. Section 19, or the equivalent, and with the traceability requirements specified in UL 746.4, Standard for Polymeric Materials – Short Term Property Evaluations.
17.3 Any insulation for a protector intended for use in a Class F or higher insulated motor shall comply with Protector Insulation Test. Section 19 and with the traceability requirements specified in UL 746A, Standard for Polymeric Materials — Short Term Property Evaluations.
17.4 Deleted March 28, 2001
17.5 Current-carrying parts of a protector shall be metal inherently resistant to corrosion or shall be treated to resist corrosion. Iron and steel paris shall be protected by enameling. galvaniiing, plating or other means when the corrosion of such parts results in risk of electric shock, fire, or Injury to persons.
Exception: Multimetallic thermal elements and heater elements are not required to be protected.
