1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(
2、s); however, it is currently not part of the UL Standard(s) referencedbelow.Product Category (CCN): UBJY2Standard Number: UL 1030Standard Title: Standard for Sheathed Heating ElementsEdition Date: March 31, 2015Edition Number: 8Section / Paragraph Reference: Supplement SASubject: Medium Voltage Shea
3、thed Heating ElementsDECISION:Supplement SA - Medium Voltage Sheathed Heating ElementsINTRODUCTIONSA1 ScopeSA1.1 These requirements cover industrial-use medium voltage metal-sheathed heating elementsintended for use in appliances and equipment that comply with the requirements for such appliances an
4、dequipment. The requirements in this Supplement are applied in addition to the requirements specified inthis standard.SA1.2 These requirements cover sheathed heating elements rated between 601 and 15,000 V. Theserequirements cover between the cold pin of the element and the end cap.SA1.3 These requi
5、rements do not cover heating elements for use in equipment for use in hazardouslocations as defined in the National Electrical Code, NFPA 70.SA1.4 Wherever the terms heating element and element are used in these requirements, they areintended to mean a sheathed heating element as defined in Section
6、2.4 of this Standard.SA1.5 The medium in which these elements will be used is to be determined by the end product.SA1.6 These requirements cover cartridge-type sheathed heating elements that do not incorporate a bendin the sheath.SA2 GlossarySA2.1 For the purpose of this supplement the following def
7、initions apply in addition to the definitions inthe preceding sections of this Standard.SA2.2 MEDIUM VOLTAGE - Voltages between 601 V and 15,000 V.Note: National Electrical Code, NFPA 70 defines any voltage above 1000 V as High Voltage.SA3 Units of MeasurementUL COPYRIGHTED MATERIAL NOT AUTHORIZED F
8、OR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSA3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.CONSTRUCTIONSA4 GeneralSA5 InsulationSA5.1 The thickness of magnesium oxide (MgO) or other similar insulating
9、material between theresistance element and the inside of the sheath, and the material of an end seal between the terminal pinand the inside of the sheath, shall not be less than the Minimum MgO thickness values specified in TableSA6.1.SA6 SpacingsSA6.1 Spacings through air and over surface between l
10、ive parts of opposite polarity, and between liveparts and dead metal parts, shall not be less than the values indicated in Table SA6.1.Table SA6.1SpacingsVoltage rating Minimum spacingsSpacings through air and over surface Minimum MgO thicknessClearance through Creepage alongV mm (in) mm (in) mm (in
11、)2500 maxa25.4 (1.0) 50.8 (2.0) 2.7 (0.11)7200 maxa50.8 (2.0) 88.9 (3.5) 5.0 (0.20)15,000 maxa102 (4.0) 178 (7.0) 12.8 (0.50)aBecause of the effect of configuration, spacings in excess of those indicated may be required to meet performancerequirements of this standard.SA6.2 Spacings at wiring termin
12、als shall be in accordance with the requirements for the end-use product.SA7 ComponentsSA7.1 Wiring shall comply with the Standard for Appliance Wiring Material, UL 758, and be suitable forthe particular application when considered with respect to the temperature and voltage, and conditions ofservic
13、e to which the wiring is likely to be subjected.SA7.2 Supplemental Insulation Where the requirements for supplemental insulation (e.g. tape, sleevingor tubing) are not specified, the insulation or device is required to fulfill SA7.3 or a performancerequirement of this Standard. In such cases:a) Slee
14、ving shall comply with the Standard for Coated Electrical Sleeving, UL 1441,b) Tubing shall comply with the Standard for Extruded Insulating Tubing, UL 224.SA7.3 In determining whether splice insulation consisting of coated fabric, thermoplastic, or other type ofsleeving or tubing is acceptable, con
15、sideration is to be given to such factors as the materials dielectricproperties, heat-resistant and moisture-resistant characteristics.STANDARD NUMBER: UL 1030 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSA7.4 End Seals and Insulating b
16、ushings - constructed of Phenolic, ceramic, porcelain, and cycloaliphaticepoxies are able to be used without additional temperature evaluation. Other materials shall be used inaccordance with their rating established for the intended conditions of use are considered to fulfill therequirements of thi
17、s Standard.SA7.5 A component of a product covered by this Standard shall comply with the requirements for thatcomponent.PERFORMANCESA8 GeneralSA8.1 Medium Voltage Sheathed Heating Elements shall be subjected to the test sequence specified inTable SA8.1.Table SA8.1Test sequence for Medium Voltage Hea
18、ting ElementsNumber ofsamplesTest Paragraph3Power Input SA9.1Dielectric SA10.1Resistance to Moisture (7 day Humidity Conditioning) SA11.1Insulation Resistance 11.1 (a)Dielectric SA10.1SA9 Power Input TestSA9.1 The Power Input Test of Section 9 is to be conducted.SA10 Dielectric Voltage-Withstand Tes
19、tSA10.1 A heating element shall withstand without breakdown for one minute the application of a 60-hertzessentially sinusoidal potential of the value specified in Table SA10.1 between live parts and exposeddead metal parts in a well heated condition.STANDARD NUMBER: UL 1030 -3-UL COPYRIGHTED MATERIA
20、L NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable SA10.1Test voltages for dielectric voltage-withstand testVoltage rating volts Test voltage601 - 15,000 V 2000 V plus (2.25 x nominal voltage rating)SA11 Resistance to Moisture TestSA11.1 The Resistance to Moistu
21、re Test of Section 11 is to be conducted except for 7 days. The valuesfor the Dielectric Voltage Withstand Test shall be obtained from Table SA10.1.MANUFACTURING AND PRODUCTION LINE TESTSSA12 Dielectric Voltage-Withstand TestSA12.1 The Production Line Dielectric Voltage-Withstand Test of Section 15
22、shall be conducted witheither the 60-second test or the one-second test and associated voltage potential as specified in TableSA12.1 applied between live and exposed dead metal parts.Table SA12.1Production-line test conditionsMethodaApplication time, seconds Applied potentialVolts FrequencyElement r
23、ating, volts601 - 15,000 V2 (single-phase) 60 2000V+2.25Vb60 Hz3 (single-phase) 1 2400V+2.25Vb60 HzaMethod 2 is described in 15.3; method 3 is described in 15.5.bV is the voltage determined in accordance with 9.2.RATINGSA13 DetailsSA13.1 A heating element shall be rated in volts and volt-amperes or
24、watts. The voltage rating shall beany appropriate single voltage or range of voltage.MARKINGSA14 DetailsSA14.1 Markings as specified in Section 17 apply.RATIONALE FOR DECISION:Presently UL 1030, the Standard for Sheathed Heating Elements covers sheathed heating elements rated600 volts or less. Suppl
25、ement SA is being added to cover industrial-use medium voltage metal-sheathedheating elements rated between 601 and 15,000 V that are intended for use in appliances and equipment.Similar requirements for Medium Voltage have already been adopted and utilized across otherComponent Standards, such as U
26、L 347.STANDARD NUMBER: UL 1030 -4-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSome of the key critical issues that are part of this Supplement are as follows: These requirements cover metal sheathed heating elements rated between 601 and 1
27、5,000 V. These requirements cover only cartridge-type sheathed heating elements that do notincorporate a bend in the sheath. Spacings, per Table 6.1, were developed at 7200 V max and 15000 V max as well as Minthickness for Magnesium Oxide insulation at max Voltage ratings. Medium Voltage Sheathed He
28、ating Element Test Sequence was developed per Table SA8.1; Medium Voltage Sheathed Heating Element Test voltages for dielectric voltage-withstand testin Table SA10.1The Test Sequence in Table SA8.1 differs from a traditional metal Sheathed Element Test Sequence thatis used in free air (worst case) a
29、nd requiring Thermal Endurance. As the Thermal Endurance Test isintended to evaluate stress on the sheath and coil at the bend of an elements construction, and theMedium Voltage Sheathed Heating Elements are only covering cartridge-type sheathed heating elementsthat do not incorporate a bend in the
30、sheath, the Thermal Endurance Test is not considered applicable.This follows the same testing principle for Cartridge elements in UL 499 but UL 1030 Supplement SAprovides a Sequence of Testing as in the base part of UL 1030.In addition, the Resistance to Moisture Test was reduced from a 60 days to 7
31、 days of HumidityConditioning as the Medium Voltage Sheath Elements will be Commercial / Industrial types and will notsee the same issues related to the residential sheath heating elements types. Residential elements wereoften mass produced and stored in warehouses with high humidity that infiltrate
32、d the end seal. This is thesame reason why we allow a 2.5 MIU spike during Leakage Current to burn off this humidity. For ourCommercial / Industrial testing, 7 days was determined as a suitable time for conditioning.Copyright 2017 UL LLCUL LLC, in performing its functions in accordance with its obje
33、ctives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of UL LLC. in practically applying therequirements of the standard. They do not represent
34、formal interpretations of the standard underAmerican National Standards Institute (ANSI) processes. UL LLC shall not be responsible to anyone forthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyobligation or liability for damages, including consequ
35、ential damages, arising out of or in connection withthe use or reliance upon Certification Requirement Decisions. The electronic version of the CertificationRequirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 1030 -5-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 1030 -6-No Text on This Page
