1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2108 Low Voltage Lighting SystemsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
2、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 This new edition of ANSI/UL 2108 was issued to incorporate the following change: Revision to requirements for Luminaires i
3、ntended for the Storage Space of a Closet. The revised requirements are substantially in accordance with Proposal(s) on this subject dated July 31, 2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electro
4、nic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be li
5、able for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility o
6、f such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability
7、, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. DECEMBER 7, 2015 UL 2108 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DIST
8、RIBUTION WITHOUT PERMISSION FROM UL DECEMBER 7, 2015 UL 2108 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 7, 2015 1 UL 2108 Standard for Low Voltage Lighting Systems First Edition February, 2004 Second Edi
9、tion December 7, 2015 This ANSI/UL Standard for Safety consists of the Second Edition. The most recent designation of ANSI/UL 2108 as an American National Standard (ANSI) occurred on December 7, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Com
10、ments 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 http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor elec
11、tronic 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 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 2108-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED
12、FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 7, 2015 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 Mea
13、surement .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 12 Corrosion Protection 15 13 Damp and Wet Location
14、s 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 Switches .20 22 Accessibility to Live Parts 20 23 Electrical Spacings 22 24 Elect
15、rical 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 30 PERFORMANCE 32 General 32 33 Input and Output Tests 32 DECEMBER 7, 2015 L
16、OW VOLTAGE LIGHTING SYSTEMS - UL 2108 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 33.1 Input test 32 33.2 Maximum output test .33 34 Normal Temperature Test 33 34.1 General .33 34.2 Power units 36 34.3 Additional test conditions 36 35 A
17、bnormal 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 Relief for Flexible Cord Test 43 42 Mounting Means Test .43 42.1 Tension load
18、ing 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 TESTS 46 Dielectric Voltage Withstand Test .46 47 Continuity of Grounding
19、 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 INSTALLATION INSTRUCTIONS 49 Power Units 53 50 Exposed Bare Conductors .54 PART
20、II EXPOSED BARE CONDUCTOR LUMINAIRES AND CLASS 2 LUMINAIRES GENERAL 51 General 54 CONSTRUCTION MECHANICAL 52 General Construction 55 53 Enclosure 55 54 Mounting Means 56 DECEMBER 7, 2015 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRI
21、BUTION 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 Connections 58 PERFORMANCE 60 Normal Temperature Test 59 61 Abnormal Recessed Temperature Test 59 62 Luminaire
22、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 General .62 67.2 Exposed bare conductor luminaires .64 67.3 Class 2 luminaires 64 INSTRUCTIONS 68 General 64 PART I
23、II 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 SUPPLEMENTARY REQUIREMENTS 74 Incandescent Luminaires 68 DECEMBER 7, 2015 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 5UL C
24、OPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 75 Fluorescent Luminaires 69 76 Surface Mounted Luminaires .69 77 Recessed Mounted Luminaires .70 APPENDIX A Standards for ComponentsA1 DECEMBER 7, 2015 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 6UL C
25、OPYRIGHTED 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 components intended for permanent installation and for use in locations in accordance with the National Electri
26、cal 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) Class 2, exposed bare conductor, POE, and other low-voltage luminaires and lighting systems. 1.3 These requirem
27、ents 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 153, the Standard for Track Lighting Systems, UL 1574, or the Standard for Luminaires, UL 1598. 1.4 Light emit
28、ting 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 Light Emitting Diode (LED) Equipment for Use in Lighting Products, UL 8750. 2 Units of Measurement 2.1 Values sta
29、ted 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. 3.2 ACCESSIBILITY BARRIER A material provided to limit access to uninsulated current-carrying parts that invol
30、ve 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 cabinets and similar location, such that all or part of the unit is located within the interior space of the cabin
31、et. 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 involve a risk of re, and to protect internal parts from the environment and from mechanical damage. All or part of
32、 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 electrical supply connections for one or more luminaire assemblies, including assemblies capable of being repos
33、itioned 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 against inadvertent shorting and overloading; or DECEMBER 7, 2015 LOW VOLTAGE LIGHTING SYSTEMS - UL 2108 7UL COP
34、YRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL b) Exposed insulated conductors provided with integral protection against inadvertent shorting by insulation or an insulated coating. 3.7 LAMP CONTAINMENT BARRIER Any part of the luminaire that surro
35、unds 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 of moisture in, on, or adjacent to electrical equipment, and includes partially protected locations. 3.9 LOCA
36、TION, 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 adequate to prevent an accumulation of moisture. 3.10 LOCATION, WET A location in which water or other liquid may
37、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 risk of electric shock. 3.12 NOMINAL OUTPUT WATTAGE/LOAD Specied by power unit or system manufacturer as total la
38、mp 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 becoming an open hole. 3.14 OPEN HOLE An aperture in an enclosure or a recessed housing that is not covered or lled
39、 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 transformer or electronic power supply of output voltage not exceeding the risk of electric shock; b) Is inte
40、nded 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 category 5 (CAT5) or similar cables and connectors to concurrently carry power and data, with voltage and power wi
41、thin 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 cavity and serves to close off the opening from the room side, and does not necessarily enclose conductors or
42、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 RECESSED UNIT A luminaire or power unit that is designed to be either wholly or partially recessed in a mountin
43、g surface. Thermally Protected Type IC A recessed luminaire or power unit that is designed and identied for installation in a cavity lled with thermal insulation. The unit may be in direct contact with combustible materials and the insulation. Type Non-IC, Thermally Protected A recessed luminaire or
44、 power unit that is designed for installation in a cavity with minimum dimensions and spacings to thermal insulation and combustible material that comply with the installation code. It is not intended to be in contact with or covered with combustible materials and insulation. Type Non-IC, Concrete O
45、nly A luminaire or power unit that is not provided with thermal protection because it is investigated and identied for installation only in poured concrete. Inherently Protected A luminaire or power unit that is investigated and identied for installation in a cavity where the unit is in direct conta
46、ct with thermal insulation or combustible materials and the construction is such that, even without a thermal protector, a luminaire is unable to be overlamped or mislamped, or a power unit overloaded to the extent that operating temperatures are exceeded in accordance with the prescribed limits in
47、Table 34.1. 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 current ow through a 1500 W resistor in parallel with a 0.015 F capacitor connected between the two points exceeds
48、a5m 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 locations 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 1
49、0 200 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 ripple voltage on a dc waveform exceeds 10% of the dc voltage, the waveform shall be considered a combined waveform
