1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 710B Recirculating SystemsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODU
2、CTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Recirculating Systems, UL 710B Second Edition, Dated September 2, 2011 Summary of Topics These revisions to UL 710B are being issued are being issued to address the following changes in requirements: Clarication of Requireme
3、nts for Interlocks Standards Updates Pertaining to Class 2 Circuits Clarications to the Capture Test to Align with Current Practices and Procedures Clarication for Simultaneous Conduct of Fire Extinguishment Tests Clarication for Mechanical Actuation Clarication on Markings for Non-integral Recircul
4、ating Systems New Requirements for Integral and Non-Integral Recirculating Downdraft Systems 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 an
5、d are followed by an effective date note indicating 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 August 23, 2013 and May 23, 2014. All rights reserved. N
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10、chasers computer system. The requirements in this Standard are now 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
11、 revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. AUGUST 14, 2014 UL 710B tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL The following table lists the fut
12、ure effective dates with the corresponding reference. Future Effective Dates References September 2, 2014 Entire Standard AUGUST 14, 2014 UL 710B tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 2, 2011 (Title Page Reprinted: Aug
13、ust 14, 2014) 1 UL 710B Standard for Recirculating Systems First Edition September, 2004 Second Edition September 2, 2011 This ANSI/UL Standard for Safety consists of the Second edition including revisions through August 14, 2014. The most recent designation of ANSI/UL 710B as an American National S
14、tandard (ANSI) occurred on August 13, 2014. 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 submitted to UL at any time. Proposals should be submitted vi
15、a 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 Standards and all copyrights, ownerships, and rights regarding
16、 those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2014 UNDERWRITERS LABORATORIES INC. ANSI/UL 710B-2014UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 2, 2011 RECIRCULATING SYSTEMS - UL 710B 2 No Text o
17、n This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .8 2 Components 9 3 Units of Measurement .9 4 Undated References 9 5 Glossary .9 CONSTRUCTION 6 Accessories .13 7 Mechanical Assembly 14 7.1 General 14
18、7.2 Mounting of components .15 7.3 Shipping .15 8 Electrical and Fire Enclosures .16 8.1 General 16 8.2 Metallic enclosures 18 8.3 Nonmetallic enclosures .19 8.4 Fire containment General Other than hood exhaust system .19 8.5 Fire containment Enclosures for overcurrent protective device 23 9 Accessi
19、bility of Live Parts .24 9.1 General 24 9.2 Fuses, circuit breakers, supplementary protectors, and manually reset controls .29 10 Protection of Service Personnel 31 11 Interlocks .32A 11.1 General 32A 11.2 Moving parts .34 12 Protection Against Corrosion .34 13 Electrical Supply Connections 34 13.1
20、General .34 13.2 Wiring compartment 35 13.3 Field-wiring terminals and leads 37 13.4 Grounded supply conductor .38 13.5 Equipment grounding connection .39 14 Bonding for Grounding 40 15 Polarity 41 16 Current-Carrying Parts 42 17 Attachment-Plug Receptacles 42 18 Internal Wiring 43 18.1 General .43
21、18.2 Insulation 43 18.3 Protection .44 18.4 Wiring in circuits involving a risk of re or electric shock 44 18.5 Splices and connections 45 18.6 Strain relief 46 18.7 Bushings 47 19 Casters 47 20 Electrical Insulation .48 21 Thermal Insulation 50 SEPTEMBER 2, 2011 RECIRCULATING SYSTEMS - UL 710B 3UL
22、COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 22 Components Located in Grease Airstream .50 23 Motors and Transformers 51 23.1 Motors in circuits involving a risk of re or electric shock 51 23.2 Motor protection 51 23.3 Transformers 52 24 Sho
23、rt-Circuit and Ground-Fault Protection .52 24.1 General .52 24.2 Supplementary-type overcurrent protective devices used as short-circuit and ground-fault protection .54 24.3 Protection for circuits including specic components 55 24.4 Protection for wiring located outside the enclosure .56 24.5 Prote
24、ction for high-voltage control circuits conductors .57 25 Auxiliary-Circuit Terminals .58 26 Capacitors .58 27 Switching Devices 59 27.1 General .59 27.2 Electrical ratings .60 27.3 Guarding 61 27.4 Specic applications 61 28 Lampholders .61 29 Secondary Circuits 62 29.1 General .62 29.2 Evaluation o
25、f the different types of secondary circuits .65 29.3 Class 2 circuits .67 29.4 Limited voltage/current circuits .67 29.5 Limited voltage circuit requirements 68 29.6 Limited energy circuits 69 29.7 Limiting impedance circuits 69 29.8 Safety extra-low voltage circuits 70 30 Lithium Battery Circuits 7
26、0 31 Isolating Devices .71 32 Electrical Spacings 71 32.1 General .71 32.2 Secondary circuits 74 33 Insulating Barriers 74 34 Clearance and Creepage Distances .76 35 Separation of Circuits .78 36 Gas-Tube Signs 79 37 Fire Extinguishing System Unit .79 38 Fire Actuated Damper Assemblies 81 39 Hood As
27、sembly .82 40 Hood Materials .82 41 Hood Airow .82 42 Filters .83 42.1 Electrostatic precipitator .83 42.2 Passive air lters .83 42.3 Odor lters 83 42.4 Grease lters 83 42.5 Filter interlocks .84 SEPTEMBER 2, 2011 RECIRCULATING SYSTEMS - UL 710B 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER RE
28、PRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE ELECTRICAL TESTS 43 General 84 44 Power Input Test .85 45 Normal Temperature Test 85 45.1 General .85 45.2 Surface temperatures .88 45.3 Test equipment 89 45.4 Procedure .90 45.5 Normal test conditions 92 46 Dielectric Voltage-Withsta
29、nd Test .92 46.1 General .92 46.2 Primary circuits 93 46.3 Secondary circuits 93 46.4 Transformers 94 47 Insulation Resistance Test .94 48 Grounding and Bonding Test .95 48.1 Grounding .95 48.2 Bonding .96 49 Stability 97 50 Short-Circuit Tests 97 51 Breakdown of Components Test 98 52 Wiring Enduran
30、ce Test 99 53 Strain Relief Test 100 54 Push-Back Relief 100 55 Strength of Enclosures, Frames, and Guards Test .100 55.1 General 100 55.2 Static force test .101 55.3 Impact test frames, guards, and metal enclosures .101 PERFORMANCE RECIRCULATING SYSTEM TESTS 56 General 101 57 Lower Airow Limit Dete
31、rmination .102 58 Capture Test 103 59 Emission Test 104A 59.1 General .104A 59.2 Test apparatus 104B 59.3 Sampling procedure .105 59.4 Sample handling 105 59.5 Analysis 106 59.6 Results 107 60 Damper Tests .107 60.1 General 107 60.2 Cycling test .108 60.3 Closure test 108 60.4 Damper re actuation te
32、st 108 61 Fire Extinguishment Tests 109 61.1 General 109 61.2 Performance parameters .110 61.3 Automatic operation re test .110B 61.4 Delayed operation re test 110B 61.5 Deep fat fryers and tilt skillets .110B AUGUST 14, 2014 RECIRCULATING SYSTEMS - UL 710B 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FO
33、R FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 61.6 Griddle .112 61.7 Range top 112 61.8 Radiant char-broilers 113 61.9 Lava, pumice, or synthetic rock char-broilers 113 61.10 Upright broiler .113 61.11 Chain broiler .114 61.12 Wok-type appliance 114 62 Cooking Temperature Splash
34、Test .115 62.1 General 115 62.2 Deep fat fryer .115 62.3 Range top 115 62.4 Wok .116 63 Manual Operation Test .116 63.1 Electrical actuation 116 63.2 Mechanical actuation 116 64 Ozone Test .116 65 Physical and Immersion Tests for Gaskets and Seals 117 65.1 Tensile strength and elongation .117 65.2 A
35、ging and immersion 117 65.3 Volume change .117 PERFORMANCE COMPONENTS 66 General 118 67 Transformer Burnout Test 118 68 Endurance Test for Interlock Switches .118 69 Motor Switch Overload Test .119 70 Printed-Wiring Board Abnormal Operation Test 119 71 Secondary Circuits .120 71.1 General 120 71.2 M
36、aximum voltage test .120 71.3 Maximum current test for inherently limited circuits 121 71.4 Limited power point determination test .122 71.5 Component failure test .123 71.6 Maximum power test 124 71.7 Power dissipation test .125 72 Parts Subject to Contact with Oil or Other Liquids .125 73 Permanen
37、ce of Marking 127 MANUFACTURING AND PRODUCTION TESTS 74 Dielectric Voltage-Withstand 127 RATINGS 75 General 129 MARKINGS 76 General 131 77 Visible to Operator .132 78 Visible After Installation .134 79 Visible During Installation and Examination .137 SEPTEMBER 2, 2011 RECIRCULATING SYSTEMS - UL 710B
38、 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 80 Visible During Servicing Operations 138 81 Nonpermanent Marking .140 INSTRUCTIONS 82 Manufacturers Literature .140 SUPPLEMENT SA - INTEGRAL AND NON-INTEGRAL RECIRCULATING, DOWNDRAFT SYSTEM
39、S INTRODUCTION SA1 Scope SA1 SA2 Glossary SA1 CONSTRUCTION SA3 Materials .SA2 SA4 Interlocks .SA2 SA5 Grease Filters .SA2 SA6 Fire Extinguishing System Unit SA3 PERFORMANCE SA7 Capture Test SA3 SA8 Fire Extinguishment Tests SA4 MARKING SA9 General SA4 Appendix A Standards for ComponentsA1 AUGUST 14,
40、 2014 RECIRCULATING SYSTEMS - UL 710B 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover the following recirculating systems rated 600 volts or less and intended for indoor use: a) Non-integral
41、 recirculating systems for installation in commercial establishments for the preparation of food; b) Electric commercial cooking appliances provided with integral recirculating systems intended for installation in commercial establishments for the preparation of food; and c) Vending machines provide
42、d with integral recirculating systems. 1.2 These devices incorporate an air ltering system enclosed in a hooded or otherwise contained area intended to capture air from the cooking process area. The hood assembly typically includes a fan, collection hood, or equivalent design and an air ltering syst
43、em (consisting of a grease lter with or without other ltering means). In addition, except as noted in the Exceptions to 37.1 and 38.1, the hood assembly includes a re actuated damper, and a re extinguishing system. 1.3 Recirculating systems covered by these requirements are intended for installation
44、 in accordance with: a) The Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, NFPA 96; b) The National Electrical Code, ANSI/NFPA 70; and c) Other codes such as the International Mechanical Code (IMC), and the Uniform Mechanical Code (UMC). 1.4 Integral recircula
45、ting systems shall comply with the requirements for the cooking appliance as noted below, except as modied or superseded by the requirements in this Standard. a) Commercial electric cooking appliances shall comply with the requirements in the Standard for Commercial Electric Cooking Appliances, UL 1
46、97. b) Vending machines shall comply with the requirements in the Standard for Vending Machines, UL 751. SEPTEMBER 2, 2011 RECIRCULATING SYSTEMS - UL 710B 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2 Components 2.1 Except as indicated
47、in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components generally used in the products covered by this standard. 2.2 Except as indicated in this clause, a component of a product covere
48、d by this standard shall comply with the requirements for that component. See the Standards for Components appendix for a list of standards covering components generally used in the products covered by this standard. 2.3 A component shall be used in accordance with its rating established for the int
49、ended conditions of use. 2.4 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 be used only under those specic conditions. 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 4 Undated References 4.1 Any undat
