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): ELBZ, ELBZ2, ELBZ3, AXUT3Standard Number: UL 817Standard Title: Standard for Cord Sets and Power-Supply CordsEdition Date: March 11, 2015Edition Number: 12Section / Paragraph Reference: (New) 9.12.1 -
3、 9.12.3 (New) Section 19A, 19A.1 -19A.9Subject: Adding requirements for testing of electronic circuitryDECISION:9.12.1 A polymeric material used as an enclosure or in contact with electrical components shall have asuitable relative thermal index rating in accordance with the Standard for Polymeric M
4、aterials ShortTerm Property Evaluations, UL 746A, or the Standard for Polymeric Materials Long Term PropertyEvaluations, UL 746B.9.12.2 A printed wiring board shall comply with the Standard for Printed-Wiring Boards, UL 796, and havea minimum flammability rating of HB as determined by the applicable
5、 tests in the Standard for Tests forFlammability of Plastic Materials for Parts in Devices and Appliances, UL 94.9.12.3 The temperature measured on a printed wiring board shall not exceed its maximum operatingtemperature when tested in accordance with the Temperature Test, 12.2, when corrected to 25
6、C (77F)ambient temperature.19A Tests for Electrical Components19A.1 The breakdown of an electrical component as simulated by the test described in 19A.2 -19A.9 shallnot result in the risk of injury to persons, or the risk of fire or electric shock as determined by the existenceof any of the followin
7、g conditions:a) Glowing, charring, or flaming of the cheesecloth or tissue paper specified in 19A.4;b) The opening of the 3 A fuse connected to ground specified in 19A.5;c) Emission of flame, sparks, or molten metal from the enclosure;d) Development of an opening in the overall enclosure that expose
8、s live parts and increases therisk of electric shock (see 6.3); ore) Loss of structural integrity to such a degree that the equipment collapses or experiencesdisplacement of parts that may:1) Lead to short-circuiting or grounding of live parts,2) Affect the function of any safety controls such as th
9、ermostats, overload protectivedevices, waterseals, or strain relief.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULA component located in the supplementary circuit in accordance with 9.8 or an optical isolator thatcomplies with the requiremen
10、ts in the Standard for Optical Isolators, UL 1577 need not be subjected tothis test.19A.2 The malfunction of a component such as a diode, a transistor, a thyristor, an electrolytic capacitor,an integrated circuit, an optical isolator, or other electronic component which has not been determined tobe
11、reliable by a reliability investigation and which could result in a risk of fire or electric shock, are to besimulated. In order to simulate the malfunction of a component, the circuit between any two terminals ofthe component is to be opened and/or shorted. Only one of the two simulated fault condi
12、tions is to beimposed at one time. For a multi-terminal device, only two terminals are to be short-circuited at a time.Simulated circuits may be used, but if the tests performed on simulated circuits indicate likely damage toother parts of the product to the extent that the safety of the product may
13、 be affected, the test is to berepeated on the product.19A.3 Each simulated fault condition is to be conducted on a separate unit unless it is agreeable to allthose concerned that more than one test be conducted on the same unit.19A.4 The unit is to be placed on a softwood surface covered with white
14、 tissue paper. A single layer ofcheesecloth is to be draped loosely over the entire enclosure.19A.5 Exposed dead-metal parts of the unit are to be connected to ground througha3Anon-time-delayfuse.19A.6 The unit is to be connected to a 60 Hz, 120 V supply source. The supply circuit is to have aminimu
15、m 20 A branch circuit overcurrent protection.19A.7 The test is to be conducted for 7 hours or until at least one of the following results are observed:a) A risk of fire or electric shock develops,b) The branch-circuit overcurrent protection opens,c) The equipment protective device opens,d) Any other
16、 circuit component opens, ore) A minimum of one hour elapses, circuit conditions stabilize, and there is no further evidenceof overheating of parts.19A.8 With reference to of 19A.7(e), the overheating of parts may be detected by an indicator such as anodor, smoke, discoloration, cracking of material
17、s, charring, flaming, glowing, arcing, changes in circuitcurrent through the applied fault, or any similar phenomenon.19A.9 If a fault condition is terminated by opening of a circuit component as specified in 19A.7(d), the testis to be conducted two more times using new components for each test.RATI
18、ONALE FOR DECISION:Due to end product demand, UL is being requested to evaluate electronic components in power supplycords and cord sets. The above requirements are being proposed for the evaluation of printed wiringboards and associated components housed within fittings and other enclosures.Copyrig
19、ht 2017 UL LLCSTANDARD NUMBER: UL 817 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL LLC, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions
20、 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 formal interpretations of the standard underAmerican National Standards Institute (ANSI) pr
21、ocesses. 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 consequential damages, arising out of or in connection withthe use or reliance upon Certification
22、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 817 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 817 -4-No Text on This Page
