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1、Subject 5211655 Scott Blvd. Santa Clara, CA 95050 October 19, 2001 TO:Electrical Council of Underwriters Laboratories Inc., Fire Council of Underwriters Laboratories Inc., Subscribers to ULs Standards Service for Heat Detectors for Fire Protective Signaling Systems SUBJECT:Request for Comments on Pr
2、oposed Requirements for the Seventh Edition of the Standard for Heat Detectors for Fire Protective Signaling Systems, UL 521; PROPOSED EFFECTIVE DATE SUMMARY OF TOPICS This bulletin proposes the following changes in requirements: 1. Increased Stringency of the Low-Temperature Exposure Test 2. Updati
3、ng of the Extraneous Transient Test to Refl ect Current Technology 3. Additional Requirements for the Overload Test for Non-self-restoring Detectors 4. Decrease of the Distance Between the Center Nozzle and the Tested Unit in the Rain Test 5. The Addition of an Impact Test 6. The Addition of a Color
4、 Code for Low Temperature Range Units 7. Updating of Marking and Installation Requirements COMMENTS DUE: JANUARY 25, 2002 Attached as Appendix A for your review and comment are proposed requirements for UL 521. Questions regarding interpretation of requirements should be directed to the responsible
5、UL Staff. Please see Appendix B of this bulletin regarding designated responsibility for the subject product categories. Please note that proposed requirements are of a tentative and early nature and are for review and comment only. Current requirements are to be used to judge a product until these
6、requirements are published in fi nal form. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 02/17/2008 23:24:51 MSTNo reproduction or networking permitted without license from IHS -,-,- PRODUCTS
7、AND INDUSTRIES AFFECTED BY THE PROPOSAL UL requests your assistance in identifying other products or industries that might be affected by the requirements contained in this bulletin. UL suggests that all suppliers or customers for these products and industries be made aware of these requirements pri
8、or to their proposed effective date. Also, please forward your suggestions to UL so that these products and industries may be identifi ed in future bulletins. PROPOSED EFFECTIVE DATE The proposed requirements will necessitate a review and possible retest of currently Listed products. Therefore, UL p
9、roposes that the new requirements become effective 24 months after publication. This is intended to provide manufacturers with sufficient time to submit modifi ed products for investigation and to implement the necessary changes in production. Please note that this also includes the time that will b
10、e needed by UL to conduct a review of the modifi ed product. REQUESTS FOR COMMENTS ON PROPOSALS Please provide the following: 1. Your comments concerning the proposed requirements; and 2. Your comments concerning the proposed effective date, should the proposals be adopted. Comments should be made i
11、n writing and may be sent by fax to (408) 556-6045 or by mail to the attention of Kristin Andrews at ULs Santa Clara Office. Comments may also be sent via E-mail to Kristin.L.A. Please reference all correspondence to Subject 521. All comments should be sent by January 25, 2002. Unless specifi cally
12、requested to do so, UL will not acknowledge comments indicating concurrence with these proposals. UNDERWRITERS LABORATORIES INC. KRISTIN ANDREWS (Ext. 32452) Engineering Project Handler Standards Department Santa Clara Office (408) 985-2400 REVIEWED BY: JOHN PARSSINEN (Ext. 42723) Engineering Group
13、Leader Conformity Assessment Services 3017ANBK Northbrook Office (847) 272-8800 SR/EE bul-20011019 OCTOBER 19, 2001SUBJECT 521-2- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 02/17/2008 23:24
14、:51 MSTNo reproduction or networking permitted without license from IHS -,-,- APPENDIX A PROPOSED REQUIREMENTS AND PROPOSED EFFECTIVE DATES FOR THE SEVENTH EDITION OF THE STANDARD FOR HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS, UL 521 For your convenience in review, proposed additions to e
15、xisting requirements are shown underlined and proposed deletions are 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 (PROPO
16、SED). A paragraph that is proposed to be deleted is identifi ed by (DELETED) and is shown lined-out. 1. Increased Stringency of the Low-Temperature Exposure Test RATIONALE Heat detectors can be specifi ed for use in places where the ambient air temperatures are kept at a low level, such as a walk-in
17、 freezer. UL proposes to reduce the temperature of this test to provide a better evaluation of detectors used at low temperatures. Additionally, adoption of these more severe requirements will facilitate the harmonization efforts between UL 521 and the Canadian Standard ULC S530. IMPACT Because thes
18、e requirements are more severe than existing requirements a review and retest of all UL Listed Heat Detectors will be necessary. PROPOSAL (REVISED) 24.1 Three heat detectors shall comply with the requirements of the Oven Test, Section 19, the Operating Temperature Test, Section 22, or the Rate-of-Ri
19、se Operation Test, Section 23, whichever is applicable, after exposure for 24 hours to a temperature of minus 22 3.6F 40 3.6F (minus 30 2C 40 2C). The units are to be tested immediately after the contacts return to the normal position. Heat sensitive cable is to be as described in 19.13. Revised 24.
20、1 effective 24 months from date of publication 2. Updating of the Extraneous Transient Test to Refl ect Current Technology RATIONALE The Extraneous Transients Test currently described in Section 29.3 of UL 521 specifi es no frequencies higher than 450 MHz. Modern communication technology has evolved
21、 to include devices (i.e. cellular telephones) which operate at higher frequencies. The addition of 866 MHz and 901 MHz frequencies will bring this test in line with currently available communications technology. Additionally, UL has determined that the repeatability of the test would be improved by
22、 the addition of a measurement of electric fi eld strength during testing. Repeatability would be improved because the actual fi eld strength would be measured at each detector under test. The present distance measurement also does not take into account differences in fi eld strength caused by low b
23、attery voltage at the transmitter, specifi c antenna orientation, etc. The proposed revisions would minimize these variations. UL proposes, therefore, to revise paragraphs 29.1.1 and 29.3.2 to include the increased operating frequencies for transmitter-receiver units and requirements for the measure
24、ment of electric fi eld strength. OCTOBER 19, 2001SUBJECT 521-A1- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 02/17/2008 23:24:51 MSTNo reproduction or networking permitted without license f
25、rom IHS -,-,- IMPACT Should these proposals be adopted, manufacturers of currently Listed detectors may need to modify their products to comply with the proposed changes. A review and retest of currently Listed detectors will therefore be necessary. PROPOSALS (REVISED) 29.1.1 An Two electronic heat
26、detectors: a) Shall operate for its their intended signaling performance; and b) Shall not initiate a false alarm or a trouble signal; and c) Shall not have their sensitivities affected adversely after being subjected to 500 internally induced transients, extraneous transients, 500 (high-voltage) su
27、pply line transients, and 60 supply line (low-voltage) circuit transients, while energized from a source of supply as specifi ed in Test Voltages, Section 16, and connected to the devices intended to be used with the detector. The sensitivity shall not be adversely affected after being subjected to
28、500 internally induced transients, extraneous transients, 500 (high voltage) supply line transients, and 60 supply line (low-voltage) circuit transients, while energized from a source of supply as specifi ed in Test Voltages, Section 16, and connected to the devices intended to be used with the dete
29、ctor. Revised 29.1.1 effective 24 months from date of publication (REVISED) 29.3.2 To determine compliance with 29.3.1, two detectors are to be energized from a source of rated voltage and frequency and subjected to transients generated from the following devices located 1 foot (305 mm) from the det
30、ector, interconnecting wires, or both. The time of application for condition A is to a) shall be at least 2 minutes. Conditions (b), (c), (d), and (e) are to be applied for 10 cycles, each application of 2 seconds duration, except the last application shall be of a 2-minute duration. Near the end of
31、 the last cycle, the detector is to be subjected to an abnormal amount of heat to determine whether the unit is operational with the transient applied. For condition (b), the 1-foot distance is to be measured from the transmitter-receiver (walkie-talkie) antennae to the surface of the detector. a) S
32、equential arc (Jacobs ladder) generated between two 15 inch (381 mm) long, No. 14 AWG (2.1 mm2) solid copper conductors attached rigidly in a vertical position to the output terminals of an oil burner ignition transformer or gas tube transformer rated 120 volts, 60 hertz primary, 10,000 volts, 60 he
33、rtz, 23 milliamperes secondary. The two wires are to be formed in a taper, starting with a separation of 1/8 inch (3.2 mm) at the bottom (adjacent to terminals) and extending to 1-1/4 inches (31.8 mm) at the top. b) Energization and transmission of random voice message of three separate transmitter-
34、 receiver units (walkie-talkies) in turn, each having a 5 watt output and operating in the following nominal frequencies: 1) 27 megahertz, OCTOBER 19, 2001SUBJECT 521-A2- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/56
35、20001114 Not for Resale, 02/17/2008 23:24:51 MSTNo reproduction or networking permitted without license from IHS -,-,- 2) 150 megahertz, and 3) 450 megahertz, 4) 866 megahertz, and 5) 910 megahertz. A total of six energizations are to be applied from each transmitter-receiver; fi ve to consist of 5
36、seconds on and 5 seconds off, followed by one consisting of a single 15-second energization. For this test, the walkie-talkies are to be in the same room and on the same plane as the detector under test. A total of six energizations in each of two orientations are to be applied from each transmitter
37、- receiver; fi ve to consist of 5 seconds on and 5 seconds off, followed by one consisting of a single 15second energization. For this test the cellular phones are to be in the same room and on the same plane as the detector under test. The cellular phones are to be positioned to generate a fi eld s
38、trength of 20 volts/meter at the power-sensing antenna adjacent to the detector under test. The test is to be conducted with the antenna tip pointed directly at the detector, and at a right angle to the fi rst position, centered on the detector. c) Energization of an electric drill rated 120 volts,
39、60 hertz, 2.5 amperes. d) Energization of a soldering gun rated 120 volts, 60 hertz, 2.5 amperes. e) Energization of a 6-inch (152-mm) diameter solenoid-type vibrating bellawith no arc suppression and rated 24 volts dc. aEdwards Model 439D-6AW vibrating bell rated 0.075 ampere, 20/24 volt dc or equi
40、valent. Revised 29.3.2 effective 24 months from date of publication 3. Additional Requirements for the Overload Test for Non-self-restoring Detectors RATIONALE UL wishes to adopt a specifi c test for non-self-restoring detectors that will provide a more comprehensive evaluation of the contact operat
41、ion. Additionally, this more severe requirement will facilitate the harmonization efforts between UL 521 and the Canadian Standard ULC S530. IMPACT A review and retest of all UL Listed non-self-restoring heat detectors will be necessary should this proposal be adopted. PROPOSAL (NEW) 31.2.3 For non-
42、self-restoring detectors, the test shall consist of having three samples carry the current continuously for 1 hour without undue burning or opening of the contacts, nor blowing of the ground fuse. Added 31.2.3 effective 24 months from date of publication OCTOBER 19, 2001SUBJECT 521-A3- Copyright Und
43、erwriters Laboratories Inc. Provided by IHS under license with ULLicensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 02/17/2008 23:24:51 MSTNo reproduction or networking permitted without license from IHS -,-,- 4. Decrease of the Distance Between the Center Nozzle and the Tes
44、ted Unit in the Rain Test RATIONALE UL wishes to reduce the spray head/detector distance in order to provide a more severe test of the detectors ability to resist water penetration into functional areas. Additionally, adoption of this requirement will serve to facilitate the harmonization efforts be
45、tween UL 521 and the Canadian Standard ULC S530. IMPACT A review and retest of all UL Listed heat detectors listed for outdoor use will be required should this proposal be adopted. PROPOSALS (REVISED) 33.3 The test apparatus is to consist of three spray heads mounted in a water supply pipe rack as s
46、hown in Figure 33.1. Spray heads are to be constructed in accordance with the details shown in Figure 33.2. The water pressure for all tests is to be maintained at 5 psig (34.4 kPa) at each spray head. The distance between the center nozzle and the unit is to be approximately 5 feet (1.52 m) 39 inch
47、es (1000 mm). The unit is to be brought into the focal area of the three spray heads in such a position and under such conditions that the greatest quantity of water will enter the unit while it is mounted on a vertical surface in a position of intended use. The spray is to be directed at an angle o
48、f 45 degrees to vertical toward the unit or openings closest to current-carrying parts. The total exposure is to be for 24 hours. Revised 33.3 effective 24 months from date of publication This is generated text for fi gtxt. OCTOBER 19, 2001SUBJECT 521-A4- Copyright Underwriters Laboratories Inc. Pro
49、vided by IHS under license with ULLicensee=University of Texas Revised Sub Account/5620001114 Not for Resale, 02/17/2008 23:24:51 MSTNo reproduction or networking permitted without license from IHS -,-,- This is generated text for fi gtxt. (CURRENT) Figure 33.1 Rain-test spray-head piping OCTOBER 19, 2001S