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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 2517 (1004-1) July 24, 2007 SUMMARY OF TOPICS The following changes in requirements are being proposed: 1) For Preliminary Review Only: The proposed fi rst edition of UL 1004-1, Rotating Electrical Machines - General Requirements,
2、 including the following changes: a) Addition of UL 840, the Standard for Insulation Coordination Including Clearances and Creepage Distances for Electrical Equipment as a means for evaluating the adequacy of spacings; b) Elimination of the Locked Rotor Cycling Test as an alternative to UL 1692, the
3、 Standard for Polymeric Materials Coil Forms, as a means of evaluating the efficacy of Class A insulation systems; c) Revision of the method for evaluating nonmetallic functional motor parts used in rotating machines; d) Means to evaluate motors suitable for Field (as opposed to factory) installatio
4、n; e) Clarifi cation of the requirement for a normal temperature and ratings test for rotating machines; f) Updating of requirements for capacitors used in motors to refl ect current capacitor technology; g) Documentation of the requirements for compatibility of oil used in rotating machinery as a c
5、ooling medium; h) Reduction in the potential required for dielectric testing of low-voltage rotating machinery; i) Glossary and term revisions COMMENTS DUE: SEPTEMBER 14, 2007 The proposed fi rst edition of UL 1004-1 is being provided for review and comment prior to being balloted by the Standards T
6、echnical Panel for Motors (STP 1004). Comments were received during the July 28, 2006 preliminary review and the January 10 b) Elimination of the Locked Rotor Cycling Test as an alternative to UL 1692, the Standard for Polymeric Materials Coil Forms, as a means of evaluating the efficacy of Class A
7、insulation systems; c) Revision of the method for evaluating nonmetallic functional motor parts used in rotating machines; d) Means to evaluate motors suitable for Field (as opposed to factory) installation; e) Clarifi cation of the requirement for a normal temperature and ratings test for rotating
8、machines; f) Updating of requirements for capacitors used in motors to refl ect current capacitor technology; g) Documentation of the requirements for compatibility of oil used in rotating machinery as a cooling medium; h) Reduction in the potential required for dielectric testing of low-voltage rot
9、ating machinery; i) Glossary and term revisions RATIONALE Proposal submitted by Frank Ladonne, UL UL proposes the fi rst edition of UL 1004-1, Rotating Electrical Machines General Requirements. The proposed UL 1004-1 is the fi rst standard in a series of standards. UL 1004-1 addresses the general re
10、quirements for all rotating machinery, and subsequent standards in the series will address the particular product requirements and will cover specifi c constructions, such as servo and stepper motors, generators, impedance protected motors, and so on. UL 1004 series is a consolidation and rewrite of
11、 UL 1004, 1004A, UL 1004B, and UL 2111. The rewrite and consolidation of the rotating machinery requirements is intended to result in Standards and requirements that are more refl ective of current and emerging technologies such as brushless DC (BLDC) or electrically commutated motors (ECM), servo m
12、otors, stepper motors, and the like. In addition, this is intended to result in Standards that represent the most current technical philosophies. UL 1004, UL 1004A, UL 1004B, and UL 2111 will eventually be withdrawn after the new UL 1004-1 and series standards are published. Refer to the correlation
13、 table below for the background of the proposed UL 1004-1 requirements. The following topics are presented as an overview of the major new issues that are addressed in this proposed standard: a) Addition of UL 840, the Standard for Insulation Coordination Including Clearances and Creepage Distances
14、for Electrical Equipment UL is proposing to allow the application of UL 840 as an alternative to the creepage and clearance requirements for rotating machinery. UL 840 draws on much of the same philosophy as IEC 60664, the International Standard for Insulation Co-ordination within Low-Voltage System
15、s including Clearances and Creepage Distances for Equipment. In lieu of hard and fast requirements for creepage and clearance, UL 840 takes into consideration the degree of pollution and the level of overvoltage that the product experiences and provides for performance rather than construction based
16、 evaluation of the adequacy of creepage and clearance spacings. With the increasing trend toward miniaturization in rotating machinery, providing this alternative will enable manufacturers to reduce spacings, which leads to a reduction in the overall size of the machine. See Section 18, Spacings. b)
17、 Elimination of the Locked Rotor Cycling Test as an alternative to UL 1692, the Standard for Polymeric Materials Coil Forms, as a means of evaluating the efficacy of Class A insulation systems UL is proposing to eliminate the Locked Rotor Cycling Test (UL 1004, the Standard for Electric Motors, 25.2
18、) as an alternative to UL 1692, the Standard for Polymeric Materials Coil Forms, as a means of evaluating the efficacy of Class A insulation systems (see UL 1004, 14.7). Under the current requirements, Class A insulation systems may either be evaluated to the requirements of UL JULY 24, 2007SUBJECT
19、2517-2- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/06/2007 23:59:51 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DI
20、STRIBUTION 1692 or, alternatively, be evaluated by having the simple Locked Rotor Cycling Test (LRCT), described in UL 1004, 25.2, performed. Experience has revealed that offering the LRCT as an option to the UL 1692 evaluation is not always practical for either motor manufacturers or end product ma
21、nufacturers seeking to use these motors. When the LRCT is selected as the evaluation means, ULs end product Standards still require that further tests be performed in the end product investigation to completely evaluate the acceptability of the insulation system. These tests generally include Abnorm
22、al Conditioning, a Running Overload Test, and a minimum 300 hour Thermal Aging Test. Thus, the LRCT is not a fi nal and conclusive means of evaluating Class A insulation systems. In contrast, a UL 1692 evaluation is a conclusive means of evaluating a Class A insulation system without requiring furth
23、er testing. Additionally, UL is proposing that the requirement to evaluate Class A insulation system materials through testing only apply to thermoplastic materials. The UL 1692 program for the evaluation of Class A insulation system materials is designed to assess the thermal degradation of the mat
24、erial properties as a function of time and elevated temperature. There is strong technical evidence that thermoset materials and those materials that behave as thermoset materials at Class A temperatures (those materials listed in Table 14.1 of UL 1004) exhibit no discernable evidence of a degradati
25、on of properties when exposed to the temperatures and times prescribed by the UL 1692 program. In addition, our lack of Field Report history to the contrary further supports our proposal to accept thermoset materials and those materials listed in UL 1004, Table 14.1 for use in Class A insulation sys
26、tems without further evaluation. See Section 23, Insulation Systems. c) Revision of the method for evaluating nonmetallic functional motor parts used in rotating machines UL is proposing to revise the requirements for the evaluation of non-metallic functional parts (NMFP) used in motors. Under the c
27、urrent requirements, NMFP are required to undergo both a mold stress relief test (UL 1004, 25.1) as well as an 18 day locked rotor cycling test (LRCT) (UL 1004, 25.2). Consistent with the proposal for the evaluation of Class A insulation system materials, above, there is strong technical evidence th
28、at thermoset materials and those materials that behave as thermoset materials at Class A temperatures (those materials listed in Table 14.1 of UL 1004) exhibit no discernable evidence of a degradation of properties when exposed to the temperatures and times prescribed by the LRCT. In addition, our l
29、ack of Field Report history to the contrary further supports our proposal to accept thermoset materials and those materials listed in UL 1004, Table 14.1 for use as NMFP without further evaluation. In addition, UL believes that the universal practice of requiring the LRCT for the evaluation of NMFP
30、speciously painted all motor constructions with the same broad brush. UL believes that the various different motor constructions each exhibit different failure mode characteristics that must be considered in the practical and realistic evaluation of NMFP. Accordingly, UL is proposing that NMFP be ev
31、aluated as illustrated in the fl ow chart provided as Figure 28.1. See Section 28, Non-metallic Functional Parts. Clarifi cation was added to the test acceptance criteria to underscore that opening of the ground fuse or failure of the dielectric test, in and of itself, was not to be considered a fai
32、lure unless the opening or dielectric failure was as a result of the part (NMFP) being evaluated. d) Means to evaluate motors suitable for Field (as opposed to factory) installation Historically, with the notable exception of Fire Pump Motors, UL has treated motors as a component suitable only for f
33、actory installation. UL believes that though this remains true for smaller motors intended for use in appliances and tools, for example, larger motors intended to be protected by motor drives or magnetic motor starters are purchased as commodities and intended to be fi eld installed. In recognition
34、of this, requirements have been provided that allow for the evaluation of motors greater than 10 horsepower in size to determine their suitability for fi eld installation. JULY 24, 2007SUBJECT 2517-3- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employee
35、s/1111111001, User=Wing, Bernie Not for Resale, 08/06/2007 23:59:51 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION The proposed requirements for motors intended for fi eld installation would be the same as those
36、 requirements for factory installation but also includes requirements to address safety concerns unique to the fi eld installation of such products. These include: 1) Constraints on the size and location of openings and accessibility requirements intended to protect the user from contact with energi
37、zed or moving parts. (See Sections 9, 12 and 13) 2) Mechanical tests on the motor enclosure (See Section 32, Mechanical Tests) UL has clarifi ed the differentiation between those requirements that apply to machines intended for Field vs. Factory installation. These clarifi cations have been added to
38、: Section 9, Section 12, Exception No. 2 of 13.1, Section 18, Table 31.1 item 4, and Section 32. e) Clarifi cation of the requirement for a normal temperature and ratings test for rotating machines There is some ambiguity concerning the requirement for a rating and normal temperature test for motors
39、. UL is proposing to explicitly state the requirement that all motors submitted for certifi cation have a Ratings Test and a Normal Temperature Test performed and that these tests be concluded with acceptable results as a condition for certifi cation. This is being proposed to clarify the requiremen
40、ts because UL believes that it is necessary to evaluate a motor to ensure that it is capable of operating within its stated ratings. See Section 30, Ratings Tests, and Section 31, Temperature Test. A consistently sound means of evaluating the compliance of motors requiring a stream of cooling air to
41、 the temperature limits of the insulation Class is to perform that evaluation in the intended end-use product as part of the end-product evaluation. Consequently, an Exception was added to 31.1. f) Updating of requirements for capacitors used in motors to refl ect current capacitor technology In an
42、effort to recognize the current state of capacitor technology, UL proposes to update our requirements for capacitors used in motors. This updating will take the form of: 1) Eliminating the reference to Askarel as a dielectric medium fl ammability benchmark. (Askarel has not seen use as a dielectric
43、medium for over 30 years. 2) Eliminating the need for dry metallized fi lm capacitors operating under 330 Vrms to have a maximum available fault current (AFC) rating. 3) Reducing the required maximum AFC for capacitors connected in series with a motor winding from the current 5,000 amperes to instea
44、d a value equal to the maximum current available to the short circuited capacitor when connected in series with the motor winding.See Section 26, Capacitors. g) Documentation of the requirements for compatibility of oil used in rotating machinery as a cooling medium For many years, UL has seen motor
45、s using oil as a cooling medium. These oil immersed motors have been subjected to a test program designed to evaluate the dielectric properties of the oil, the ability of the oil to maintain those dielectric properties at elevated temperatures and the compatibility of the oil with the other insulati
46、ng system materials used in the motor construction. UL proposes that these requirements be added to UL1004-1 to refl ect current practice. See Section 23, Insulation Systems, and Section 39, Oil Compatibility Test. Additionally, an Exception for low-voltage machines was added to 39.3 to be consisten
47、t with the requirements of Section 36, Dielectric Voltage Withstand Test. JULY 24, 2007SUBJECT 2517-4- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/06/2007 23:59:51 MDTNo reproduction or networki
48、ng permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION h) Reduction in the potential required for dielectric testing of low-voltage rotating machinery Currently, routine production line dielectric testing of motors requires that all motors undergo a
49、 1,000 volt minimum dielectric voltage withstand test. There are currently constructions of motors that operate at potentials below the generally accepted thresholds for shock hazard potential (42.4 volts AC peak or 60 volts DC). To address these constructions, UL is proposing to reduce the production line dielectric withstand requirement for such motors from the current 1,000 volts to 500 volts, which is consistent with ULs end