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1、Subjects 1042 (1278, 2021) (In reply, refer to Subject 1042) 1285 Walt Whitman Road Melville NY 11747 July 25, 2003 TO:Standards Technical Panel (STP) for Electric Room Heaters, STP 1042 Subscribers to ULs Standards Service for Electric Baseboard Heating Equipment, UL 1042 Movable and Wall- or Ceili
2、ng-Hung Electric Room Heaters, UL 1278 Fixed and Location-Dedicated Electric Room Heaters, UL 2021 Other Interested Parties SUBJECT:Report of the Meeting of the Standards Technical Panel of UL for Electric Room Heaters; Request for Comments on Possible Future Requirements for the Fourth Edition of t
3、he Standard for Electric Baseboard Heating Equipment, UL 1042; Third Edition of the Standard for Movable and Wall- or Ceiling-Hung Electric Room Heaters, UL 1278; and Second Edition of the Standard for Fixed and Location-Dedicated Electric Room Heaters, UL 2021 SUMMARY OF TOPICS The following topics
4、 were discussed at the meeting: 1. Call to Order 2. Announcements 3. Introduction of Members, Guests and Observers 4. Air Heater Surface Temperatures (UL 1278 and 2021) 5. Maximum Flux Density for Radiant Air Heaters (UL 1278 and 2021) 6. Elimination of Automatic Reset Type Temperature Limiting Cont
5、rols (UL 1278 and 2021) 7. Opening of All Ungrounded Conductors (UL 1042, 1278 and 2021) 8. Temperature Measurement During Abnormal Operation Tests (UL 1042, 1278 and 2021) 9. Dielectric Voltage Withstand Performed Immediately After Abnormal Operation Tests (UL 1042, 1278 and 2021) Copyright Underwr
6、iters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:35:50 MDTNo reproduction or networking permitted without license from IHS -,-,- 10. Additional Manufacturing and Production Line Test Under QA Audit Program
7、 (UL 1042 and 1278) 11. Marking Format According to ANSI Z535.4 (UL 1042, 1278 and 2021) 12. Instructions for Use and Care (UL 1042 and 2021) 13. Separate Installation and Operating Instructions (UL 1042 and 2021) 14. Added Cleaning Instructions (UL 2021) 15. Cord Connected Heaters and LCDIs and AFC
8、Is (UL 1042 and 1278) 16. ALCIs for Bathroom Air Heaters (UL 1278) 17. Sheathed Heating Elements (UL 1042, 1278 and 2021) 18. Fire Indicator Materials (UL 1042, 1278 and 2021) 19. NEC Changes (UL 1042, 1278 and 2021) 20. Temperature-Limiting Devices (UL 1278 and 2021) 21. Temperature-Regulating Cont
9、rols (UL 1042 and 2021) 22. Normal Operation and Temperature-Limiting Devices (UL 1042, 1278 and 2021) 23. Temperature-Regulating Controls required to Operate at -35 C (UL 1278) 24. Surface Temperatures on Back of Fixed Air Heaters (UL 2021) 25. Wire Insulation and Internal Temperature of Fixed Air
10、Heaters (UL 2021) 26. Thermal Imaging Camera (UL 1042, 1278 and 2021) A meeting of the Standards Technical Panel of UL for Electric Room Heaters was held on June 17 SD;sd JULY 25, 2003SUBJECT 1042-16- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employee
11、s/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:35:50 MDTNo reproduction or networking permitted without license from IHS -,-,- APPENDIX A POSSIBLE FUTURE REQUIREMENTS FOR THE FOURTH EDITION OF THE STANDARD FOR ELECTRIC BASEBOARD HEATING EQUIPMENT, UL 1042,THE THIRD EDITION OF THE STAN
12、DARD FORMOVABLE AND WALL- OR CEILING-HUNG ELECTRIC ROOM HEATERS, UL 1278,THE SECOND EDITION OF THE STANDARD FORFIXED AND LOCATION-DEDICATED ELECTRIC ROOM HEATERS UL 2021 For your convenience in review, possible future additions to existing requirements are shown underlined and proposed deletions are
13、 shown lined-out. Proposed new requirements are identifi ed by (NEW). In the case of extensively revised paragraphs, the original text is identifi ed by (CURRENT) and is lined-out, followed by the proposed text identifi ed by (PROPOSED). A paragraph that is proposed to be deleted is identifi ed by (
14、DELETED) and is shown lined-out. Numbered items correspond to the numbered items in the meeting report. 6. AUTOMATIC TEMPERATURE-LIMITING CONTROLS (UL 1278 and 2021) UL 1278 (CURRENT) 28.1 With respect to the Normal Temperature Test, Section 39, and Abnormal Operation Tests, Section 41, if operation
15、 of the heater in accordance with Subsection 39.2 could result in a risk of fi re or electric shock due to overheating of the heater, a thermal cutoff or a manual reset type temperature limiting control shall be provided. The manual reset type temperature limiting control shall be of a type that wil
16、l not operate as an automatic reset control when the reset means is held in the reset position. Exception:An automatic reset type temperature limiting control or a manual reset type temperature limiting control that operates as an automatic reset type when the reset means is held in the reset positi
17、on may be used as a control to limit temperatures for the heaters specifi ed in (a) (d) below. a) For a heater that complies with the abnormal ambient test, 41.9, and is provided with an alarm in accordance with Alarms, Section 29. b) For a heater in which the averageontime per cycle over four cycle
18、s of operation on the temperature limiting control during each abnormal operation temperature test does not exceed 5 percent and the averageontime does not exceed 1 minute. The control used shall withstand an endurance test consisting of 100,000 cycles of operation making and breaking its rated load
19、. c) For a heater in which the manual reset control reset means is arranged such that it: 1)Is recessed within the overall appliance enclosure, 2)Cannot be forced to remain in the reset position by likely methods, such as taping down a push-button or wedging a push-button in an opening through which
20、 it protrudes, and 3)Is not jammed in the reset position during the Element Support Impact Tests, Section 51 and Drop Test, Section 52, or d)For a commercial/industrial heater. JULY 25, 2003SUBJECT 1042-A1- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Em
21、ployees/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:35:50 MDTNo reproduction or networking permitted without license from IHS -,-,- (PROPOSED) 28.1 With respect to the Normal Temperature Test, Section 39, and Abnormal Operation Tests, Section 41, if operation of the heater in accorda
22、nce with Subsection 39.2 could result in a risk of fi re or electric shock, the heater shall be provided with a temperature limiting control . The temperature limiting control shall consist of one of the following types: 1) A manual reset type temperature limiting control that will not operate as an
23、 automatic reset control when the reset means is held in the reset position, 2) A thermal cutoff, 3) A positive temperature coefficient type such that the contacts will remain open and require resetting by disconnecting power to the control; the contacts will not reclose before the room ambient temp
24、erature attains a temperature of 35 C ( 31 F), 4) An automatic reset type that complies with paragraph 41.1.14 and at least one of the controls noted in 1 - 3 above. (NEW) 41.1.14 During the abnormal tests the temperatures of the terrycloth, cheesecloth or blanket material shall not exceed 175 C (34
25、7 F), except that during the initial 5 cycles of operation of the limit control or 2 hours, whichever comes fi rst, a temperature of 200 C (392 F) is permitted. The temperature of the terrycloth is to be measured on the side not facing the heater. For multiple layers, the layer closest to the heater
26、 is to be considered. The temperature of the cheesecloth is to be measured by thermocouples located between the layers of the cheesecloth. The temperature of the blanket is to be measured by thermocouples located between the two layers of blanket closest to the heater. (DELETED) 29 Alarms 29.1 A hea
27、ter as specifi ed in (a) of exception to 28.1, or a heater employing an automatically reset auxiliary temperature control, shall include an audible or visual alarm to indicate that one or more controls has operated. The alarm shall become energized when an abnormal ambient condition occurs and a con
28、trol functions to de-energize the heater. If the control functions to reenergize the heater the alarm may be de-energized or it may remain energized until it has been de-energized manually. Exception:A heater employing an automatically reset auxiliary temperature control need not be provided with an
29、 alarm if the heater complies with 39.1.1 (normal temperature tests) when operated with the auxiliary temperature control operational and with the temperature limiting control bypassed under the abnormal operation conditions specifi ed in 41.2 41.12. 29.2 An audible alarm shall consist of a sounding
30、 device such as a buzzer, horn, beeper, or bell that generates a continuous distinct signal while it is energized. The alarm shall comply with the Alarm Device Endurance Test, Section 40. JULY 25, 2003SUBJECT 1042-A2- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLice
31、nsee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 06/18/2007 22:35:50 MDTNo reproduction or networking permitted without license from IHS -,-,- 29.3 A visual alarm shall consist of a light that is red and of a different color than the lamp used in the power on pilot light (see 31.1) o
32、r of a fl ashing indicator light that has an on time not less than one third of the off time and that cycles on and off at least 15 times a minute. The light shall be constructed and located as specifi ed in 31.1 and it shall comply with the visibility requirements in 31.2. The lamp used in the indi
33、cator light shall have a minimum rated life of 20,000 continuous hours at rated voltage, or it shall withstand the test specifi ed in the Alarm Device Endurance Test, Section 40. 29.4 The Important Instructions furnished with a heater that includes an alarm shall include instructions in accordance w
34、ith of 65.2.1(16). (DELETED) 40 Alarm Device Endurance Test 40.1 With regard to 29.1 and 29.2, an audible alarm device and a control which activates the alarm shall withstand without malfunction or breakdown, an endurance test consisting of 6000 cycles of operation at the rate of 1 minute on and 30
35、seconds off. The test is to be conducted at rated voltage and at the maximum ambient temperature determined during the Normal Temperature Test, Section 39. 40.2 With regard to 29.1 and 29.3, a visual alarm device and a control which activates the alarm shall withstand without burning out or failing
36、to light, an endurance test consisting of 6000 cycles of operation at the rate of 1 minute on and 30 seconds off. The test is to be conducted at the rated voltage and at the maximum ambient temperature determined during the Normal Temperature Test, Section 39. UL 2021 (CURRENT) 25.1 With respect to
37、the conditions for Operation Tests, Section 38, and Abnormal Operation Tests, Section 42, if operation of the heater in accordance with 38.1 or if operation of the heater without any temperature-regulating or -limiting control could result in a risk of fi re or electric shock due to overheating of t
38、he heater, a back-up protective device consisting of either a thermal cutoff or a manual reset type temperature limit control shall be provided. The manual reset type limit control shall be of a type that will not operate as an automatic reset control when the reset means is held in the reset positi
39、on. Exception:An automatic reset type temperature limit control or a manual reset type limit control that operates as an automatic reset type when the reset means is held in the reset position may be used as a back-up protective device to limit temperatures for the heaters specifi ed in (a) (e) belo
40、w. a) For a heater that complies with the abnormal ambient test, 42.5.2 42.13.3.1 and is provided with an alarm in accordance with Alarms, Section 26. b) For a heater in which the averageontime per cycle over four cycles of operation on the limit control during each abnormal operation temperature te
41、st does not exceed 5 percent and the averageontime does not exceed 1 minute. The limit control used shall withstand an endurance test consisting of 100,000 cycles of operation making and breaking its rated load (see Endurance Test, Section 43). c) For a fi xed heater that is ceiling mounted or is ma
42、rked as stated in 60.23. d) For a heater in which the manual reset control reset means is arranged such that it is recessed within the overall appliance enclosure, cannot be forced to remain in the reset position by likely methods, such as taping down a push-button or wedging a push-button in an ope
43、ning through which it protrudes, and is not jammed in the reset position during the Element Support Impact Tests, Section 52, or JULY 25, 2003SUBJECT 1042-A3- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Re
44、sale, 06/18/2007 22:35:50 MDTNo reproduction or networking permitted without license from IHS -,-,- e) For a commercial/industrial heater. (PROPOSED) 25.1 With respect to the Normal Temperature Test, Section 37, and Abnormal Operation Tests, Section 42, if operation of the heater in accordance with
45、Subsection 38.1 could result in a risk of fi re or electric shock, the heater shall be provided with a temperature limiting control . The temperature limiting control shall consist of one of the following types: 1) A manual reset type temperature limiting control that will not operate as an automati
46、c reset control when the reset means is held in the reset position, 2) A thermal cutoff, 3) A positive temperature coefficient type such that the contacts will remain open and require resetting by disconnecting power to the control; the contacts will not reclose before the room ambient temperature a
47、ttains a temperature of 35 C ( 31 F), 4) An automatic reset type that complies with paragraph 42.1.6 and at least one of the controls noted in 1 - 3 above. (NEW) 42.1.6 During the abnormal tests the temperatures of the terrycloth, cheesecloth or blanket material shall not exceed 175 C (347 F), excep
48、t that during the initial 5 cycles of operation of the limit control or 2 hours, whichever comes fi rst, a temperature of 200 C (392 F) is permitted. The temperature of the terrycloth is to be measured on the side not facing the heater. For multiple layers, the layer closest to the heater is to be c
49、onsidered. The temperature of the cheesecloth is to be measured by thermocouples located between the layers of the cheesecloth. The temperature of the blanket is to be measured by thermocouples located between the two layers of blanket closest to the heater. (DELETED) 26 Alarms 26.1 A heater that utilizes one of the types of control