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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 1238 October 26, 2007 SUMMARY OF TOPICS The following is being proposed for preliminary review and comment only: 1. For Preliminary Review Only: Clarifi cations to Scope to include monitoring and LP-Gas applications 2. For Prelimi
2、nary Review Only: Clarifi cation of applicable component standards in new Appendix A 3. For Preliminary Review Only: Clarifi cation regarding undated references 4. For Preliminary Review Only: Addition of glossary term for Limited Current Circuit 5. For Preliminary Review Only: Clarifi cation of haz
3、ards in paragraph 5.1.1 6. For Preliminary Review Only: Clarifi cation of metal plate requirements for equipment located over a classifi ed area 7. For Preliminary Review Only: Clarifi cation of requirements for snap-on covers 8. For Preliminary Review Only: Clarifi cation of requirements for non-me
4、tallic parts 9. For Preliminary Review Only: Clarifi cation of requirements for adhesives 10. For Preliminary Review Only: Clarifi cation of requirements for speaker openings 11. For Preliminary Review Only: Clarifi cation of Rain Test requirements 12. For Preliminary Review Only: Clarifi cation of
5、requirements for operating handles 13. For Preliminary Review Only: Clarifi cation of corrosion protection requirements 14. For Preliminary Review Only: Deletion of obsolete wire types 15. For Preliminary Review Only: Clarifi cation of Classifi ed location motor requirements 16. For Preliminary Revi
6、ew Only: Clarifi cation of heater requirements 17. For Preliminary Review Only: Clarifi cation of insulating material requirements 18. For Preliminary Review Only: Clarifi cation of fusing requirements and regulating network requirements for limited power circuits 19. For Preliminary Review Only: Cl
7、arifi cation of requirements for limited current circuits Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 19:11:57 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR
8、 INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 20. For Preliminary Review Only: Clarifi cation of requirements for dielectric voltage withstand testing 21. For Preliminary Review Only: Clarifi cation of installation instruction and marking requirements for products intended to be used wi
9、th other equipment 22. For Preliminary Review Only: Clarifi cation of marking requirements for intrinsic safety barriers having voltage and current levels below Class 2 output 23. For Preliminary Review Only: Revision based on NEC change COMMENTS DUE: NOVEMBER 26, 2007 This proposal is for review an
10、d comment only (no ballot at this time). Please note that comments on a preliminary review document will not receive a response from the proposal author through CSDS. Instead, the proposal author will be asked to review the comments and adjust the proposals and/or supporting rationale as the author
11、determines to be appropriate. The preliminary review process is an informal mechanism that provides authors with the opportunity to refi ne their proposals before they advance to the next stage in ULs standards development process. In some cases, the author of the proposals may choose to discontinue
12、 them. In this case, the author need not do anything after preliminary review has ended. Normally, the next step in the process is the more formal STP ballot and stakeholder review process. Only comments posted during the STP ballot and stakeholder review process will be provided with a response in
13、CSDS. For your convenience in review, proposed additions to existing requirements are shown underlined and proposed deletions are shown lined-out. 1. For Preliminary Review Only: Clarifi cations to Scope to include monitoring and LP-Gas applications RATIONALE Proposal submitted by: Joe Bablo, Underw
14、riters Laboratories The word “monitoring” is added after the word “control” in order to clarify the scope and align the scope with 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 th
15、ese requirements are also used to cover equipment that is intended to be utilized as control and monitoring equipment for LP-Gas 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 electri
16、cal equipment used for the control and monitoring of fl ammable liquid and LP-Gas dispensing devices rated 600 volts or less. Such control equipment is intended to be installed in ordinary locations in accordance with the National Electrical Code, NFPA 70. OCTOBER 26, 2007SUBJECT 1238-2- Copyright U
17、nderwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 19:11:57 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 2. For Pre
18、liminary Review Only: Clarifi cation of applicable component standards in new Appendix A RATIONALE Proposal submitted by: Joe Bablo, Underwriters Laboratories This revision covers an editorial change that moves standard references to Appendix A. This puts all standard references into one location an
19、d is easier to understand. Appendix A is added to the standard with these standard references and many others and is included as a separate revision proposal. PROPOSAL 1.2 These requirements also cover electrical control equipment that is capable of being installed in or over a hazardous area as def
20、i 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 Boxes and Fittings for Use in Hazardous (Classifi ed) Locations,
21、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. OCTOBER 26, 2007SUBJECT 1238-3- Copyright Underwriters Laboratories Inc. Provided by IHS under license
22、 with ULLicensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 19:11:57 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION APPENDIX A Standards for Components Standards under which components
23、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 installation, such that any fl aming particles or drops that
24、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 the plate is located over the Classifi ed area as well. d) Flamm
25、ability, 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 generation of dangerous static charges. 7. For Preliminary Review Only
26、: 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 test requirements with the other t
27、est 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: comply with the tests in Snap-On Cove
28、rs, Section 35A. OCTOBER 26, 2007SUBJECT 1238-6- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 19:11:57 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL
29、 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), as measured by a tape stretched
30、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 direct pull of 14 pounds (62.3 N) is ap
31、plied. 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 cover (one blow per face) without
32、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 constructed of any material, that pro
33、vides 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 is applied at two points in accorda
34、nce 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 inches (127 mm) as measured by a ta
35、pe 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 returned to its normal position and a 14
36、pound (62.3 N) squeezing force is applied at the two points. OCTOBER 26, 2007SUBJECT 1238-7- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 19:11:57 MSTNo reproduction or networking permitted
37、 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.3.3. 35A.3.2 A sample of the enclo
38、sure, 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 shall be removed and replaced ten time
39、s. 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 direct force, and there shall not be
40、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 of the snap-on cover (one blow per f
41、ace). 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 on the snap-on cover. 8. For Prelim
42、inary Review Only: 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, but
43、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 intent, bu
44、t 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 requir
45、ement, 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 purposes. The
46、 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. OCTOBER 26, 2007S
47、UBJECT 1238-8- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=leee, leee Not for Resale, 11/22/2007 19:11:57 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSI
48、DE 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, 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) Moisture-abso