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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 1238 December 14, 2007 SUMMARY OF TOPICS The following changes in requirements are being proposed: 1. Clarifi cation to Scope to include monitoring and LP-Gas applications 2. Clarifi cation of applicable component standards in new
2、 Appendix A 3. Clarifi cation regarding undated references 4. Addition of glossary term for Limited Current Circuit 5. Clarifi cation of hazards in paragraph 5.1.1 6. Clarifi cation of metal plate requirements for equipment located over a classifi ed area 7. Clarifi cation of requirements for snap-o
3、n covers 8. Clarifi cation of requirements for non-metallic parts 9. Clarifi cation of requirements for adhesives 10. Clarifi cation of requirements for speaker openings 11. Clarifi cation of Rain Test requirements 12. Clarifi cation of requirements for operating handles 13. Clarifi cation of corros
4、ion protection requirements 14. Deletion of obsolete wire types 15. Clarifi cation of Classifi ed location motor requirements 16. Clarifi cation of heater requirements 17. Clarifi cation of insulating material requirements 18. Clarifi cation of fusing requirements and regulating network requirements
5、 for limited power circuits 19. Clarifi cation of requirements for limited current circuits 20. Clarifi cation of requirements for dielectric voltage withstand testing Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Japan, IHS Not
6、 for Resale, 12/17/2007 18:31:48 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 21. Clarifi cation of installation instruction and marking requirements for products intended to be used with other equipment 22. C
7、larifi cation of marking requirements for intrinsic safety barriers having voltage and current levels below Class 2 output 23. Revision based on NEC change STP BALLOTS AND ALL COMMENTS DUE: JANUARY 28, 2008 For your convenience in review, proposed additions to existing requirements are shown underli
8、ned and proposed deletions are shown lined-out. 1. Clarifi cation to Scope to include monitoring and LP-Gas applications RATIONALE Proposal submitted by: Joe Bablo, Underwriters Laboratories The word “monitoring” is added after the word “control” in order to clarify the scope and align the scope wit
9、h the standard title. The category covers control and monitoring equipment, so the scope should indicate such. In addition, the term “LP-Gas” was added to indicate that these requirements are also used to cover equipment that is intended to be utilized as control and monitoring equipment for LP-Gas
10、dispensers. These requirements were always used for this application, but this revision clarifi es the scope of the standard. PROPOSAL 1.1 These requirements cover electrical equipment used for the control and monitoring of fl ammable liquid and LP-Gas dispensing devices rated 600 volts or less. Suc
11、h control equipment is intended to be installed in ordinary locations in accordance with the National Electrical Code, NFPA 70. 2. Clarifi cation of applicable component standards in new Appendix A RATIONALE Proposal submitted by: Joe Bablo, Underwriters Laboratories This revision covers an editoria
12、l change that moves standard references to Appendix A. This puts all standard references into one location and is easier to understand. Appendix A is added to the standard with these standard references and many others. PROPOSAL 1.2 These requirements also cover electrical control equipment that is
13、capable of being installed in or over a hazardous area as defi ned by the Flammable and Combustible Liquids Code, NFPA 30. Electrical control equipment for installation in a Class I, Division 1 or Division 2 hazardous area shall comply with the applicable requirements of the Standard for Outlet Boxe
14、s and Fittings for Use in Hazardous (Classifi ed) Locations, UL 886; and the Standard for Switches for Use in Hazardous (Classifi ed) Locations, UL 894 for the Hazardous Location protection method employed. See Appendix A for a list of appropriate standards. DECEMBER 14, 2007SUBJECT 1238-2- Copyrigh
15、t Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 18:31:48 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION APPENDI
16、X A Standards for Components Standards under which components of the products covered by this standard are evaluated include the following: Title of Standard UL Standard Designation Ballasts, Fluorescent Lamp UL 935 Circuit Breakers b) Resistance to impact, The plate shall have no openings following
17、 installation, such that any fl aming particles or drops that fall downward will be contained by the plate with no particles or drops falling below the plate; and c) Moisture absorptive properties, The plate shall be located at a height of 18 inches minimum from the base of the product, such that th
18、e plate is located over the Classifi ed area as well. d) Flammability, e) Resistance to corrosion, f) Resistance to distortion at temperatures to which the enclosure is capable of being subjected under conditions of normal or abnormal use, g) Resistance to solvents, and h) Resistance to the generati
19、on of dangerous static charges. 7. Clarifi cation of requirements for snap-on covers RATIONALE Proposal submitted by: Joe Bablo, Underwriters Laboratories This revision is entirely an editorial change. The test requirement portion of the clause was moved to the new 35A clause in order to group the t
20、est requirements with the other test requirements in the Performance section of the standard. No changes were made to the actual requirements. PROPOSAL 5.2.4 A snap-on cover that gives access to exposed live parts and that does not require a tool for removal shall withstand the following tests: comp
21、ly with the tests in Snap-On Covers, Section 35A. DECEMBER 14, 2007SUBJECT 1238-5- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 18:31:48 MSTNo reproduction or networking permitted without l
22、icense from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION a) A cover that is capable of being removed with one hand shall not be released when a squeezing force of 14 pounds (62.3 N) is applied at any two points, the distance between which shall not exceed 5 inches (127 mm)
23、, as measured by a tape stretched tightly over that portion of the surface of the cover that is capable of being encompassed by the palm of the hand. The test shall be performed before and after ten removal and replacement operations. b) A cover shall not become disengaged from the case when a direc
24、t pull of 14 pounds (62.3 N) is applied. For this test, the cover is to be gripped at any two convenient points. The test shall be performed before and after ten removal and replacement operations. c) A cover shall withstand an impact force of 1 foot-pound (1.4 J) applied to accessible faces of the
25、cover (one blow per face) without being displaced, and there shall not be damage to internal parts or malfunction of the control as a result of this test. The radius of the ball used for this test shall not be less than 1 inch (25.4 mm). 35A Snap-On Covers 35A.1 General 35A.1.1 Any snap-on cover con
26、structed of any material, that provides the user access to hazardous circuits or moving parts when removed, shall be tested in accordance with 35A.2 35A.4. 35A.2 Squeezing force test 35A.2.1 A snap-on cover that is capable of being removed with one hand shall not be released when a squeezing force i
27、s applied at two points in accordance with 35A.2.2 35A.2.3. 35A.2.2 A sample of the enclosure, or enclosure section, provided with a snap-on cover shall be tested. The snap-on cover is to be squeezed at any two convenient points for this test. The distance between the two points shall not exceed 5 i
28、nches (127 mm) as measured by a tape stretched tightly over that portion of the surface of the cover that is capable of being encompassed by the palm of the hand. 35A.2.3 The snap-on cover shall be removed and replaced ten times. After this removal and replacement cycle, the snap-on cover is returne
29、d to its normal position and a 14 pound (62.3 N) squeezing force is applied at the two points. DECEMBER 14, 2007SUBJECT 1238-6- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 18:31:48 MSTNo r
30、eproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 35A.3 Pull force test 35A.3.1 A snap-on cover shall not become disengaged from the enclosure when a direct pull force is applied when tested in accordance with 35A.3.2 35A
31、.3.3. 35A.3.2 A sample of the enclosure, or enclosure section, provided with a snap-on cover shall be tested. The snap-on cover is to be gripped at any two convenient points for this test. The force shall be applied at a 90 degree angle to the face of the snap-on cover. 35A.3.3 The snap-on cover sha
32、ll be removed and replaced ten times. After this removal and replacement cycle, the snap-on cover is returned to its normal position and a 14 pound (62.3 N) direct pull force is to be applied. 35A.4 Impact Test of Snap-On Covers 35A.4.1 A snap-on cover shall not be disengaged when impacted with a di
33、rect force, and there shall not be damage to internal parts or malfunction of the control, when tested in accordance with 35A.4.2 35A.4.3. 35A.4.2 A sample of the enclosure, or enclosure section, provided with a snap-on cover shall be tested. 35A.4.3 The impact is to be applied to accessible faces o
34、f the snap-on cover (one blow per face). The impact is to be imparted by a solid, smooth, steel sphere 2 inches (50.8 mm) in diameter, weighing 1.18 pounds (0.54 kg). The sphere is to fall freely from rest through a vertical distance of 10.2 inches (0.26 m) thereby imparting a force of 1 foot-pound
35、on the snap-on cover. 8. Clarifi cation of requirements for non-metallic parts RATIONALE Proposal submitted by: Joe Bablo, Underwriters Laboratories 5.5.1 The entire revision is to change the reference to the clauses that are required for nonmetallic enclosures. The actual requirements do not change
36、, but due to other revisions, the references were required to change in order to maintain the intent. 5.5.3 The original text was deleted as this text referred generically to a number of concerns, but did not provide any information on how to determine compliance. The new text provides the same inte
37、nt, but references the test requirements directly. In addition, an exception was added that allows the use of nonmetallic material that already has a rated fl ame rating. This does not change the requirement. 5.5.4 A new clause was added to clarify the intent of 5.5.3. Section 35 contained an aging
38、requirement, but there was no requirement in the standard to ever have to apply the clause. The intent was clear, so the clause was applied as intended, however, the new revision clarifi es the requirement. 5.5.5 A new clause addressing metallic coatings applied to plastic enclosures for EMI purpose
39、s. The clause allows for the use of a material complying with UL 746C. Again, this requirement was applied, but never stated. PROPOSAL 5.5.1 A nonmetallic material can be used for part or all of a general purpose enclosure when it complies with the requirements in 5.5.2 and 35.1.1 5.5.5. DECEMBER 14
40、, 2007SUBJECT 1238-7- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 18:31:48 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FO
41、R OUTSIDE DISTRIBUTION 5.5.3 Among the factors taken into consideration when evaluating a nonmetallic enclosure are A nonmetallic enclosure shall comply with the following: a) The mechanical strength Flammability test, 35.3; Exception:Parts that are molded from materials that are classed as 5VA, 5VB
42、, V-0, V-1, or V-2 by the vertical burning test described in the Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94, need not be subjected to the fl ammability test described in 35.3. b) Resistance to impact Elevated temperature test, 35.4; c) Moistur
43、e-absorptive properties; Impact test, 35.5. d) Combustibility and resistance to ignition from electrical sources; e) Dielectric properties, insulation resistance, and resistance to arc tracking; and f) Resistance to distortion and creeping at temperatures to which the material is subjected to under
44、conditions of normal or abnormal usage. The material is not to display a loss of these properties beyond its minimum intended level as a result of aging. 5.5.4 Temperatures shall be monitored on the enclosure during the Normal Temperature Test, Section 29. If any part of the enclosure is subjected t
45、o a temperature rise greater than 40C, the enclosure shall be conditioned in accordance with 35.2, prior to the tests outlined in 5.5.3. 5.5.5 A metallized coating provided on a nonmetallic part, shall comply with the Standard for Polymeric Materials Use in Electrical Equipment Evaluations, UL 746C,
46、 and shall be suitable for the application to the appropriate surface material. 9. Clarifi cation of requirements for adhesives RATIONALE Proposal submitted by: Joe Bablo, Underwriters Laboratories If an adhesive is used as the sole means to hold a gasket, a glass cover, or lens in place, then the a
47、dhesive shall be evaluated for this use. This requirement was applied for all adhesives used as sole means in the past, but the requirement has been clarifi ed as part of this revision. PROPOSAL 5.6.2 If an adhesive is used to hold a gasket or glass cover in place, and failure of the adhesive would
48、allow rain to enter the enclosure or allow access to hazardous circuit sor parts, the combination shall be subjected to the Adhesion Test in the Standard for Gaskets and Seals, UL 157. 10. Clarifi cation of requirements for speaker openings RATIONALE Proposal submitted by: Joe Bablo, Underwriters La
49、boratories DECEMBER 14, 2007SUBJECT 1238-8- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 18:31:48 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSD