1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 33 Heat Responsive Links for Fire- Protection ServiceUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUT
2、HORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Heat Responsive Links for Fire-Protection Service, UL 33 Eighth Edition, Dated March 9, 2010 Summary of Topics This revision is being issued to indicate the most recent designation of ANSI/UL 33 as
3、 a Reaffirmed American National Standard. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating
4、 the date of publication or the date on which the changed requirement becomes effective. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated February 20, 2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieva
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9、 in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after t
10、he Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. APRIL 14, 2015 UL 33 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 14, 2015 UL 33 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPROD
11、UCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 9, 2010 (Title Page Reprinted: April 14, 2015) 1 UL 33 Standard for Heat Responsive Links for Fire-Protection Service The rst, second, and third editions were titled Fusible Links for Fire-Protection Service. First Edition November, 1968 Second
12、 Edition July, 1973 Third Edition March, 1980 Fourth Edition June, 1982 Fifth Edition October, 1987 Sixth Edition October, 1993 Seventh Edition March, 2003 Eighth Edition March 9, 2010 This ANSI/UL Standard for Safety consists of the Eighth Edition including revisions through April 14, 2015. The mos
13、t recent designation of ANSI/UL 33 as an American National Standard (ANSI) occurred on April 13, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be su
14、bmitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Sta
15、ndards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 33-2010 (R2015)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM
16、 UL MARCH 9, 2010 HEAT RESPONSIVE LINKS FOR FIRE-PROTECTION SERVICE - UL 33 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 Units of Measurement .4 3 Components 4 4 Undated References
17、5 5 Glossary .5 CONSTRUCTION 6 Temperature Ratings 5 7 Coatings and Platings .6 PERFORMANCE 8 Strength of Heat Responsive Element and Link Assembly Tests 6 8.1 Fusible-alloy and Bi-metallic Types .6 8.2 Glass-bulb types .7 9 Glass-Bulb Thermal Shock Test 8 10 Operating Temperature (Bath) Test 8 11 S
18、ensitivity Oven Heat Test 9 12 High Temperature Exposure Test (90-Day) Heat Responsive Links .13 13 High Temperature Exposure Test for Wax Coated Heat Responsive Links .13 14 Evaporation Test for Wax Coatings .14 15 10-Day Corrosion Test 14 16 30-Day Corrosion Test 14 16.1 General .14 16.2 20 percen
19、t salt spray .15 16.3 Moist hydrogen sulde air mixture test .15 16.4 Moist carbon dioxide sulfur dioxide air mixture test .15 MARKING 17 General 15 APPENDIX A A1 Tolerance limit calculation methods .A1 MARCH 9, 2010 HEAT RESPONSIVE LINKS FOR FIRE-PROTECTION SERVICE - UL 33 3UL COPYRIGHTED MATERIAL N
20、OT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover heat responsive links used for re-protection service. These links consist of devices intended for installation under load conditions such as for use with automatic re s
21、uppression systems; or automatic closure devices for doors, windows, dampers or smoke relief vents. 1.2 Heat responsive links are categorized by temperature rating, type of coating or plating, minimum and maximum design load, and other factors which may have a bearing on their intended use. 2 Units
22、of Measurement 2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 3 Components 3.1 Except as indicated in 3.2, a component of a product covered by this standard shall comply with the requirements for that component. 3.2 A comp
23、onent is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 3.3 A component shall be used in accordance with it
24、s rating established for the intended conditions of use. 3.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall b
25、e used only under those specic conditions. MARCH 9, 2010 HEAT RESPONSIVE LINKS FOR FIRE-PROTECTION SERVICE - UL 33 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Undated References 4.1 Any undated reference to a code or standard appearin
26、g in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 5 Glossary 5.1 For the purpose of this standard, the following denitions describe various types of heat responsive links. 5.2 BI-METALLIC TYPE Two different metals mechanically fa
27、stened together. Each metal has different expansion characteristics which act to release a load when exposed to sufficient heat. This type of device may be resettable. 5.3 FUSIBLE TYPE Two or more metallic parts having a solder element that fuses to release a load when exposed to sufficient heat. 5.
28、4 GLASS BULB TYPE Liquid-lled glass bulb that fractures to release a load when exposed to sufficient heat. 5.5 HEAT RESPONSIVE LINK A device that includes a heat responsive element and other features that allow for the application of external installation loads. 5.6 QUICK RESPONSE TYPE A heat respon
29、sive link that complies with the applicable requirements for such links as specied in Sensitivity Oven Heat Test, Section 11. CONSTRUCTION 6 Temperature Ratings 6.1 A heat responsive link shall be constructed for service where the maximum normal ambient air temperature at the point of installation d
30、oes not exceed that specied in Table 6.1. 6.2 A heat responsive link shall have one of the temperature ratings specied in Table 6.1. MARCH 9, 2010 HEAT RESPONSIVE LINKS FOR FIRE-PROTECTION SERVICE - UL 33 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMIS
31、SION FROM UL Table 6.1 Temperature classications and ratings Temperature classication Temperature ratings Maximum ambient temperature Degrees F (Degrees C) Degrees F (Degrees C) Low 125 130 (51 54) 90 (32) Ordinary 135 170 (57 77) 100 (38) Intermediate 175 225 (79 107) 150 (66) High 250 300 (121 149
32、) 225 (107) Extra high 325 375 (163 191) 300 (149) Very extra high 400 475 (204 246) 375 (191) Ultra high 500 575 (260 302) 475 (246) 7 Coatings and Platings 7.1 The operation characteristics of a heat responsive link shall not be impaired by the application of any factory applied coating or plating
33、 when tested in accordance with these requirements. 7.2 A corrosion resistant coating or plating shall be uniformly applied. 7.3 A wax coating shall not be brittle when new nor become brittle with age. 7.4 A wax coating shall not crack, ake, slip, or ow when tested at the maximum temperature for whi
34、ch the link assembly may be installed. See High Temperature Exposure Test for Wax Coated Heat Responsive Links, Section 13. PERFORMANCE 8 Strength of Heat Responsive Element and Link Assembly Tests 8.1 Fusible-alloy and Bi-metallic Types 8.1.1 A heat responsive link assembly shall either: a) Sustain
35、 a load of 5 times the maximum design load for a period of 150 hours when tested in accordance with 8.1.2; or b) Demonstrate the ability to sustain the maximum design load as specied in 8.1.3 when tested in accordance with 8.1.4 and 8.1.5. 8.1.2 At least ten sample link assemblies of the lowest temp
36、erature rating are to be loaded to ve times the manufacturers maximum design load for 150 hours at an ambient temperature of 70 5F (21 3C). One attachment end of each sample is to be connected to the test supporting apparatus. The test load is to be applied to the other attachment end in the intende
37、d direction. All ten samples shall comply with the requirements specied in 8.1.1(a). MARCH 9, 2010 HEAT RESPONSIVE LINKS FOR FIRE-PROTECTION SERVICE - UL 33 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.1.3 As an alternative to the requ
38、irements specied in 8.1.2, a heat responsive link assembly shall support a load for 1 minute when tested as specied in 8.1.4; and comply with the requirements specied in 8.1.5. 8.1.4 At least ten sample link assemblies of the lowest temperature rating are to be loaded to ve times the manufacturers m
39、aximum design load for 1 minute at an ambient temperature of 70 5F (21 3C). One attachment end of each sample is to be connected to the test supporting apparatus. The test load is to be applied to the other attachment end in the intended direction. All ten samples shall comply with the requirements
40、specied in 8.1.1(b). 8.1.5 At least ten samples are to be loaded at various values in excess of the maximum design load up to 5 times the maximum design load to derive a least-square, full logarithmic regression curve of load as a function of time, from which the loads at 1 hour and 1000 hours are t
41、o be determined. At least one sample shall sustain a load for a time greater than 100 hours. The test samples are to be loaded at a conditioned temperature of 70 5F (21 3C). The maximum design load shall then comply with the following: where: L m is the load at 1000 hours; L o is the load at 1 hour;
42、 and L d is the maximum design load. 8.2 Glass-bulb types 8.2.1 A heat responsive link assembly incorporating a glass bulb heat responsive element shall comply with the following: a) Sustain a load of 5 times the maximum design load for a period of 150 hours when tested in accordance with 8.1.2; and
43、 b) The lower tolerance limit for bulb strength, based on calculations with a degree of condence of 0.99 for 99 percent of samples, shall exceed twice the load applied to the bulb at maximum design load, based on calculations with the same degree of precision when tested in accordance with 8.2.2. 8.
44、2.2 The bulb strength is to be measured by applying a steadily increasing load, using a compression testing machine, until the bulb breaks or fractures. This test is to be conducted with the bulb mounted in the seating parts used in the assembly and the load is to be applied at a rate not exceeding
45、55 pounds-force per second (245 N/s) or at a rate the deects the bulb 0.02 inch (0.51 mm) per minute, whichever measurement is convenient for the test apparatus being used. Bulb seatings may be reinforced circumferentially in a manner not interfering with the bulb breakage. A minimum of 15 samples o
46、f each MARCH 9, 2010 HEAT RESPONSIVE LINKS FOR FIRE-PROTECTION SERVICE - UL 33 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL temperature rating and each bulb type are to be tested. Calculations are to be based on the Normal or Gaussian Di
47、stribution except where another distribution can be shown to be more applicable due to manufacturing or design factors. See Appendix A. 9 Glass-Bulb Thermal Shock Test 9.1 A glass bulb type heat responsive element assembly shall withstand the thermal shock of rapid temperature changes having a range
48、 from 20F (11C) less than its rated operating temperature to 50F (10C). At least ve sample bulbs are to be conditioned for 5 minutes in a liquid bath at 20F (11C) less than the rated operating temperature. The samples then are to be removed and immediately submerged in another liquid bath at 50F. Th
49、ere shall be no breakage or fracture of the glass bulb. 10 Operating Temperature (Bath) Test 10.1 The operating temperature of heat responsive links, when bath tested, shall operate within the range having a maximum temperature not in excess of 10F (5C) or 107 percent of the minimum Fahrenheit temperature of the range, whichever is greater. For the purpose of this determination, the marked temperature rating is to
