1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2108 Low Voltage Lighting Systems STANDARD FOR SAFETYUL 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 Low Voltage Lighting Systems, UL 2108 Second Edition, Dated December 7, 2015 Summary of Topics These revisions to ANSI/UL 2108 include the following changes in requirements: Address Equipment for U
3、se in Environmental Air Spaces Revise Requirements for Enclosure Openings Addition of Electrical Ratings for Power Units and Luminaires The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated April 14, 2017. Text that has been changed in any manner or
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8、es) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. MAY 30, 2017 UL 2108 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 30, 2017 UL 2108 tr2 No Tex
9、t on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 7, 2015 (Title Page Reprinted: May 30, 2017) 1 UL 2108 Standard for Low Voltage Lighting Systems First Edition February, 2004 Second Edition December 7, 2015 This ANSI/UL
10、 Standard for Safety consists of the Second Edition including revisions through May 30, 2017. The most recent designation of ANSI/UL 2108 as an American National Standard (ANSI) occurred on May 30, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page.
11、 Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor
12、 electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 2108-2017UL COPYRIGHTED MATERIAL NOT AUTHOR
13、IZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 30, 2017 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .7 2 Units of Me
14、asurement .7 3 Glossary .7 4 Components 10 5 Undated References .10 6 Organization and Application 10 PART I POWER UNITS GENERAL 7 General .11 CONSTRUCTION MECHANICAL 8 General Construction .11 9 Enclosure .12 10 Openings 13 11 Recessed Housings .14 11A Equipment for Use in Environmental Air-Handlin
15、g Spaces (Plenums) .14A 12 Corrosion Protection 15 13 Damp and Wet Locations 15 CONSTRUCTION ELECTRICAL 14 Current-Carrying Parts 15 15 Conductors and Cords 15 16 Splices and Connections 16 17 Transformer 17 18 Electronic Power Supply .18 19 Protective Devices 19 20 Electronic Circuits .20 21 Switch
16、es .20 22 Accessibility to Live Parts 20 23 Electrical Spacings 22 24 Electrical Barriers .22 25 Electrical Insulation .23 26 Separation of Circuits .24 27 Grounding and Bonding .25 28 Supply Connections .27 29 Secondary Connections .29 30 Exposed Bare and Insulated Conductors 29 31 Mounting Means 3
17、0 PERFORMANCE 32 General 32 MAY 30, 2017 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 2AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 33 Input and Output Tests 32 33.1 Input test 32 33.2 Maximum output test .33 34 Normal Temperature Test 33 34.1
18、 General .33 34.2 Power units 36 34.3 Additional test conditions 36 35 Abnormal Recessed Temperature Test 38 36 Overload Test 38 37 Dielectric Voltage Withstand Test .40 38 Exposed Bare Conductor Abnormal Operation Test .40 39 Component Fault Test .42 40 Grounding Continuity Test .43 41 Strain Relie
19、f for Flexible Cord Test 43 42 Mounting Means Test .43 42.1 Tension loading 43 42.2 Gravity loading .43 42.3 Test Results .44 43 Insulated Conductor Dielectric Withstand Test 44 44 Loose Luminaire/Connection Test .44 45 Insulation-Piercing Terminal Temperature Test .44 MANUFACTURING AND PRODUCTION T
20、ESTS 46 Dielectric Voltage Withstand Test .46 47 Continuity of Grounding Connection Test 48 MARKING 48 Details .48 48.1 General .48 48.2 Power units 50 48.3 Wall and ceiling surface mount .51 48.4 Under-cabinet and cabinet mount 51 48.5 Recessed mounting 52 48.6 Pictograph type markings .53 INSTALLA
21、TION INSTRUCTIONS 49 Power Units 53 50 Exposed Bare Conductors .54 PART II EXPOSED BARE CONDUCTOR LUMINAIRES AND CLASS 2 LUMINAIRES GENERAL 51 General 54 CONSTRUCTION MECHANICAL 52 General Construction 55 53 Enclosure 55 MAY 30, 2017 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 2BUL COPYRIGHTED MATERIAL N
22、OT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 54 Mounting Means 56 MAY 30, 2017 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 30, 2017 LOW VOLTAGE LIGHTING SYS
23、TEMS - UL 2108 4 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 55 Glassware .56 56 Tungsten-Halogen Lamp Containment Barrier and UV Filter .57 CONSTRUCTION ELECTRICAL 57 Leads and Conductors 58 58 Splices 58 59 Supply C
24、onnections 58 PERFORMANCE 60 Normal Temperature Test 59 61 Abnormal Recessed Temperature Test 59 62 Luminaire Drop Impact Test 60 63 Strain Relief for Conductor Test 61 64 Mounting Means Test .61 65 Abnormal Operations Test .61 66 Luminaire Component Fault Test .62 MARKINGS 67 Details .62 67.1 Gener
25、al .62 67.2 Exposed bare conductor luminaires .64 67.3 Class 2 luminaires 64 INSTRUCTIONS 68 General 64 PART III OTHER LUMINAIRES GENERAL 69 General 65 CONSTRUCTION 70 Mechanical Construction .66 71 Electrical Construction .66 PERFORMANCE 72 General 67 MARKING AND INSTRUCTIONS 73 General 67 SUPPLEME
26、NTARY REQUIREMENTS 74 Incandescent Luminaires 68 DECEMBER 7, 2015 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 75 Fluorescent Luminaires 69 76 Surface Mounted Luminaires .69 77 Recessed Mounted Lumi
27、naires .70 APPENDIX A Standards for ComponentsA1 DECEMBER 7, 2015 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements apply to low voltage lighting systems and c
28、omponents intended for permanent installation and for use in locations in accordance with the National Electrical Code, NFPA 70, Article 411. 1.2 These requirements cover: a) Power units in which output is limited to 25 A and below the risk of electric shock voltage levels as dened in 3.19; and b) C
29、lass 2, exposed bare conductor, POE, and other low-voltage luminaires and lighting systems. 1.3 These requirements do not cover low-voltage luminaires with integral power supplies or luminaires covered by other standards such as, but not limited to, the Standard for Portable Electric Luminaires, UL
30、153, the Standard for Track Lighting Systems, UL 1574, or the Standard for Luminaires, UL 1598. 1.4 Light emitting diode (LED) components and subassemblies integral to a low voltage luminaire or power unit covered by this standard shall comply with the applicable requirements of the Standard for Lig
31、ht Emitting Diode (LED) Equipment for Use in Lighting Products, UL 8750. 2 Units of Measurement 2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 3 Glossary 3.1 For the purpose of this standard the following denitions apply.
32、3.2 ACCESSIBILITY BARRIER A material provided to limit access to uninsulated current-carrying parts that involve a risk of shock and insulated current-carrying parts not intended to be subject to user contact. 3.3 CABINET MOUNTED UNIT A luminaire or power unit intended for nal installation into cabi
33、nets and similar location, such that all or part of the unit is located within the interior space of the cabinet. 3.4 CONDUCTORS, INSULATED A conductor encased within material recognized as electrical insulation. 3.5 ENCLOSURE A material provided to enclose electrical parts and components that invol
34、ve a risk of re, and to protect internal parts from the environment and from mechanical damage. All or part of the enclosure is not prohibited from also serving as an accessibility barrier or recessed housing. 3.6 EXPOSED CONDUCTORS Low voltage supply conductors, which provide physical support and e
35、lectrical supply connections for one or more luminaire assemblies, including assemblies capable of being repositioned along the length of the conductors. Exposed conductors include the following types: a) Exposed bare conductors intended for use with a power unit provided with integral protection ag
36、ainst inadvertent shorting and overloading; or DECEMBER 7, 2015 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL b) Exposed insulated conductors provided with integral protection against inadvertent sho
37、rting by insulation or an insulated coating. 3.7 LAMP CONTAINMENT BARRIER Any part of the luminaire that surrounds the lamp to contain hot particles of the lamp in the event that it ruptures. 3.8 LOCATION, DAMP An exterior or interior location that is normally or periodically subject to condensation
38、 of moisture in, on, or adjacent to electrical equipment, and includes partially protected locations. 3.9 LOCATION, DRY A location not normally subject to dampness, but may include a location subject to temporary dampness, as in the case of a building under construction, provided ventilation is adeq
39、uate to prevent an accumulation of moisture. 3.10 LOCATION, WET A location in which water or other liquid may drip, splash, or ow on or against electrical equipment. 3.11 LOW VOLTAGE LUMINAIRE A lighting unit intended for connection to a power source for which output voltage does not represent a ris
40、k of electric shock. 3.12 NOMINAL OUTPUT WATTAGE/LOAD Specied by power unit or system manufacturer as total lamp wattage. Assumes that lamps are operating at rated lamp voltage. 3.13 OPENING An aperture in an enclosure that is covered or lled by a plug or knockout and that has the potential of becom
41、ing an open hole. 3.14 OPEN HOLE An aperture in an enclosure or a recessed housing that is not covered or lled by another part. 3.15 POWER UNIT The equipment that powers and controls the luminaires in a low voltage lighting system. A power unit has the following characteristics: a) An isolating type
42、 transformer or electronic power supply of output voltage not exceeding the risk of electric shock; b) Is intended for eld installation; and c) Each secondary circuit is limited to 25 A. 3.16 POWER OVER ETHERNET (POE) A wiring system conforming to the Standard for Ethernet, IEEE 802.3 that uses cate
43、gory 5 (CAT5) or similar cables and connectors to concurrently carry power and data, with voltage and power within the class 2 limits of the National Electrical Code, NFPA 70. Also covers POE+. 3.17 RECESSED HOUSING A part of a recessed luminaire or power unit that projects into the ceiling or wall
44、cavity and serves to close off the opening from the room side, and does not necessarily enclose conductors or similar components. DECEMBER 7, 2015 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.18 R
45、ECESSED EQUIPMENT Equipment intended to be installed through (penetrating) the mounting surface, and identied as one of the following: Inherently Protected - Suitable for installation where in direct contact with thermal insulation or combustible materials, without reliance on a thermal protector to
46、 limit operating temperatures. Type IC, Thermally Protected Suitable for installation where in direct contact with thermal insulation or combustible materials. Type Non-IC, Thermally Protected Suitable for installation with minimum dimensions and spacings to thermal insulation or combustible materia
47、ls in accordance with the installation code. Type Non-IC, Concrete Only Suitable for installation only in poured concrete. 3.19 RISK OF ELECTRIC SHOCK A risk of shock exists between any two uninsulated conductive parts or between an uninsulated conductive part and earth ground, if the continuous cur
48、rent ow through a 1500 resistor in parallel with a 0.015 F capacitor connected between the two points exceedsa5m Aa n di f the open circuit voltage exceeds the following limits in Table 3.1. Table 3.1 Risk of electric shock voltage limits Maximum Voltage Waveform type a Dry and damp locations Wet lo
49、cations Sinusoidal ac 30 V rms 15 V rms Non-sinusoidal ac 42.4 V peak 21.2 V peak Continuous dc b 60 V 30 V 10 200 Hz interrupted dc c 24.8 V 12.4 V a For a combined ac + dc waveform, the dry and damp location voltage limit shall be the non-sinusoidal ac limit where the dc voltage is no more than 20.9 V, and shall be (33 + 0.45Vdc) where the dc voltage is greater than 20.9 V. The wet location voltage limit shall be half this amount. b If the peak-to-peak r
