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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 1042 December 22, 2006 SUMMARY OF TOPICS The following changes in requirements are being proposed: 1. For Preliminary Review Only: Additional Supply Cord Requirements 2. For Preliminary Review Only: Normal Operation and Temperatur
2、e-Limiting Devices 3. For Preliminary Review Only: Additional Manufacturing and Production Line Test Under QA Audit Program COMMENTS DUE: JANUARY 22, 2007 This proposal is for review and comment only (no ballot at this time). Please note that comments on a preliminary review document will not receiv
3、e a response from the proposal author through CSDS. Instead, the proposal author is asked to review the comments received during the preliminary review and adjust the proposals and/or supporting rationale as the author determines to be appropriate. The preliminary review process is an informal mecha
4、nism that provides authors with the opportunity to refi ne their proposals before the proposals advance in ULs standards development process. Normally, the next step in the process is the more formal STP ballot and stakeholder review process. Only comments newly posted during the more formal STP bal
5、lot and stakeholder review process will be addressed and responded to. 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: Additional Supply Cord Requirements RATIONALE Proposal s
6、ubmitted by: Carl Radcliffe, Underwriters Laboratories, Inc. Due to several graphs included in the supporting information for this proposal, it was necessary to prepare a separate document that includes the complete background and rationale. The information can be viewed by accessing the Word docume
7、nt attached in the CSDS Work Area. To view the document, select Topic 1 in the CSDS work area home and then Documentation under the Action menu on the left-hand side. The document is titled, Rationale for UL 1042 Proposal. In addition, it should be noted that Figures 52B.1 and 52B.2 are not provided
8、 in the body of the proposal text. They can also be viewed by selecting Topic 1 in the CSDS work area home and then Documentation under the Action menu on the left-hand side. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, B
9、ernie Not for Resale, 06/18/2007 22:09:25 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION PROPOSAL (REVISED PARAGRAPHS) 11.1.2 A portable heater shall be provided with a directly attached fl exible cord and an at
10、tachment-plug cap shall be provided on the cord for attachment to the supply circuit. The exposed length of the cord (including fi ttings) shall be no less than 6 feet (1.8 m) and no more than 8 feet (2.4 m). All detachable power-supply cords and attached power-supply cords shall comply with the req
11、uirements of the Standard for Cord Sets and Power-Supply Cords, UL 817. 11.1.3 The attachment plug cap shall be rated for general use. 11.1.4 The fl exible cord shall be as indicated in Table 11.1 or shall be of a type having such properties that it will be at least equally serviceable for the parti
12、cular application must additionally be subjected to the performance test requirements of Sections 52A.1 52D.5 11.1.7 The size of the fl exible cord, based on the current rating of the heater, shall be in accordance with Table 11.2. (NEW TABLE) Table 11.2 Cord wire size based on heater current rating
13、a Maximum current rating of heater, amperes Attachment plug connection and connections of supply cord to internal heater wiring shall be soldered, brazed, or weldedd Cord wire size AWGbAttachment plug connection crimped onlyc Cord types S, SJ, SJO, SJT, SJTO, SO, SP, SPT, SRDT, ST, STO, SV, SVO, SVT
14、, SVTO Cord types HPD, HPN, HS, HSJ, HSJO, HSO 1881010 1610.41315 1414.41820 a This table limits the heater current on the basis of cord wire size, type of cord, type of connection between the cord wires and blades of the attachment plug and connections of power supply cord to internal heater wiring
15、. For current limitation based on the attachment plug rating, see 11.1.5. b The maximum current rating for other cord sizes can be determined from Table 400-5(A), Ampacity of Flexible Cords and Cables, National Electrical Code, ANSI/NFPA 70. When the attachment plug is connected by crimping only, th
16、e current rating of the heater is not to exceed 80 percent of the rating of the corresponding wire sizes of Type S Cord, regardless of the type of cord used. c Applies to any acceptable cord type. d A soldered connection shall be mechanically secured before being soldered. A soldered connection that
17、 is crimped before being soldered is considered to be mechanically secured before soldering. A brazed or welded connection may additionally be mechanically secured before brazing or welding. 11.4 Special protection devices 11.4.1 An AFCI or LCDI provided as part of a cord-connected appliance shall c
18、omply with the Standard for Arc Fault Circuit Interrupters, UL 1699. DECEMBER 22, 2006SUBJECT 1042-2- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:09:25 MDTNo reproduction or networkin
19、g permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 11.4.2 The AFCI or LCDI shall be installed as an integral part of the attachment plug or located in the supply cord within 4 inches of the attachment plug. 11.4.3 Arc fault detection testing shal
20、l include the following as applicable: a) Carbonized path arc clearing time test; b) Point contact arc test; c) Unwanted tripping test Load Condition I; d) Unwanted tripping test Load Condition II Condition B and C; e) Unwanted tripping test Load Condition III Condition A; and f) Operation Inhibitio
21、n - Masking Exception:The test carbonized path arc clearing time test is not applicable for LCDIs that are provided with shielded power-supply cords. (NEW SECTIONS) 52A Supply Cord Abrasion 52A.1 Five cord specimens shall be subjected to an abrasion motion as described in 52A.2 52A.4 until ultimate
22、conditions are observed. Ultimate conditions are defi ned as exposure of the copper conductors or internal shield of a Leakage Current Detection-Interrupter. 52A.2 Cord specimens shall be tested without any conditioning. The apparatus and the specimens shall be in thermal equilibrium with the surrou
23、nding air at a temperature of 25.0 5.0C (77.0 9.0F) throughout the test. 52A.3 One end of each specimen shall be attached to a horizontal, reciprocating table while the table is at one end of its travel. The other end of each specimen shall be attached to a weight that exerts a force of 3.3 0.1 N or
24、 340 13 gf (12.0 0.5 ozf). Each specimen shall be laid over a quarter cylinder to whose outer surface an unused sheet of Grade 1/2 (medium) emery cloth is attached. The radius of the surface of the emery cloth shall be 90 mm (3.5 inches). The longitudinal axis of the cylinder shall be horizontal and
25、 perpendicular to each of the vertical planes that contain the specimens as they move on and are abraded by the emery cloth. 52A.4 The table shall be started in its horizontal reciprocating motion (simple harmonic motion) at the rate of approximately 28 cycles per minute, each cycle consisting of on
26、e complete back-and-forth motion, with a stroke of approximately 160 mm (6-1/4 inches). The table shall be stopped every 800 cycles and the emery cloth shall be shifted slightly to one side or replaced, so that in subsequent cycles each specimen is abraded by a fresh surface of the cloth. After reac
27、hing 4800 cycles, the cord shall be observed on a continuous basis until failure. DECEMBER 22, 2006SUBJECT 1042-3- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:09:25 MDTNo reproduction
28、 or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 52A.5 No greater than two individual specimens shall attain less than 5000 cycles. 52B Supply Cord Pinching Mandrel 52B.1 Five cord specimens shall be subjected to a crushing/pinchin
29、g force as described in paragraphs 52B.2 52B.6 until ultimate conditions are observed. Ultimate conditions are defi ned as contact between: a) The circuit conductors and the fl at horizontal surface; b) The circuit conductor and the mandrel; or c) The circuit conductors 52B.2 Cord specimens shall be
30、 tested without any conditioning. The apparatus and the specimens shall be in thermal equilibrium with the surrounding air at a temperature of 25.0 5.0C (77.0 9.0F) throughout the test. 52B.3 The cord is to be crushed between a fl at horizontal steel surface and the corner of a rigid steel mandrel.
31、The mandrel shall have a right-angle corner with a corner radius of 3/64 inch. See Figures 52B.1 and 52B.2. 52B.4 A sample length of the cord is to be laid fl at with the length of the cord at a right angle to the longitudinal axis of the mandrel. 52B.5 The circuit conductors, steel surface, and man
32、drel are to be connected to low-voltage indicators (buzzers or the like) and to power supplies. The steel surface and mandrel are to be connected together. The indicators are to provide a signal whenever contact is established between one or more of the circuit conductors and the steel surface or ma
33、ndrel. The grounding conductor, if there is one, is to be out of the circuit. An additional low-voltage indicator shall be connected in order to sense contact between the circuit conductors. 52B.6 The head of a compression testing machine is to be started moving toward the bed at a rate of 0.20 0.05
34、 in/min. The travel is to be continued until the mandrel pushes through the insulating materials of the cable and the indicator signals. 52B.7 No more than two of the fi ve samples shall have crushing force of less than 500 pound-force. This is generated text for fi gtxt. DECEMBER 22, 2006SUBJECT 10
35、42-4- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:09:25 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DIST
36、RIBUTION Figure 52B.1 Rigid steel mandrel (To view fi gure, select Topic 1 in the CSDS work area home and then Documentation under the Action menu on the left-hand side.) DECEMBER 22, 2006SUBJECT 1042-5- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Emplo
37、yees/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:09:25 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Figure 52B.2 Mandrel test (To view fi gure, select Topic 1 in the CSDS work area home and the
38、n Documentation under the Action menu on the left-hand side.) DECEMBER 22, 2006SUBJECT 1042-6- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:09:25 MDTNo reproduction or networking permi
39、tted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 52C Supply Cord Crushing - Mandrel 52C.1 Five cord specimens shall be subjected to a force of 200 pounds-force as described in 52C.2 52C.5 for seven hours. Upon completion of the test there shall not be
40、 contact between: a) The circuit conductors and the fl at horizontal surface; b) The circuit conductor and the mandrel; or c) The circuit conductors 52C.2 Cord specimens shall be tested without any conditioning. The apparatus and the specimens shall be in thermal equilibrium with the surrounding air
41、 at a temperature of 25.0 5.0C (77.0 9.0F) throughout the test. 52C.3 The cord is to be squeezed between a fl at horizontal steel surface and the corner of a rigid steel mandrel. The mandrel shall have a right-angle corner with a corner radius of 3/64 inch. See Figures 52B.1 and 52B.2. 52C.4 A sampl
42、e length of the cord is to be laid fl at with the length of the cord at right angles to the longitudinal axis of the mandrel. 52C.5 The circuit conductors, steel surface, and mandrel are to be connected to low voltage indicators (buzzers or the like) and to power supplies. The steel surface and mand
43、rel are to be connected together. The indicators are to provide a signal whenever contact is established between one or more of the circuit conductors and the steel surface or mandrel. The grounding conductor, if there is one, is to be out of the circuit. An additional low-voltage indicator shall be
44、 connected in order to sense contact between the circuit conductors. 52D Supply Cord Flexing 52D.1 Six samples of a power-supply cord shall be subjected to the test specifi ed in 52D.2 52D.7. Upon completion of the test, there shall not be: a) Development of an open circuit; b) Breakage of more than
45、 10 percent of the strands of any conductor; c) Movement of the cord in its strain relief that indicates that stress has been resulted on cord connections; d) Broken strands piercing the insulation and becoming accessible; e) Cracking or degradation of the cord insulation; or f) Exposure of the inte
46、rnal shield of a Leakage Current Detector-Interrupter DECEMBER 22, 2006SUBJECT 1042-7- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:09:25 MDTNo reproduction or networking permitted wit
47、hout license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 52D.2 With reference to 52D.1, conductors include grounding conductors. A short circuit between conductors of the cord is determined when, any time during the test, the current exceeds a value of 15 amperes or
48、greater. 52D.3 Each supply cord sample is to be mounted through a standard straight-through strain relief bushing in the test fi xture shown in Figure 52D.1. For the start of the test, the cord is positioned vertically. The cord is to be passed through a horizontal bushing having a smoothly rounded 1-inch (25.4-mm) diameter opening, located 1 foot (305 mm) below the center of rotation. The free end of the cord is to be attached to a 1/4-pound (110-g) unsupported weight. 52D.4 During the test, the conductors shall