UL 1741-2010 UL Standard for Safety Inverters Converters Controllers and Interconnection System Equipment for Use With Distributed Energy Resources (Second Edition Reprint with rev.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1741 Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER R

2、EPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resource

3、s, UL 1741 Second Edition, Dated January 28, 2010 Summary of Topics: This revisions dated March 23, 2016 were issued to incorporate the Modications to Table 67.1 for a Correction in Condition B and a Clarication of Conditions C and D Formula Usage. The new and revised requirements are substantially

4、in accordance with Proposal(s) on this subject dated October 16, 2015 and January 29, 2016. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. All rights reserved. No part of this publication may be reproduced, store

5、d in a retrieval system, or transmitted in any form by any means, electronic, 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 warranti

6、es of merchantability or tness for any purpose. In no event will UL be liable 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

7、 or an authorized UL representative has been advised of the possibility of 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, inde

8、mnify, and hold UL harmless from and against any loss, expense, liability, 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. MARCH 23, 2016 UL 1741 tr1

9、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 23, 2016 UL 1741 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 28, 2010 (Title Page Reprinted:

10、 March 23, 2016) 1 UL 1741 Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources Before November 7, 2005, the title for UL 1741 was Standard for Inverters, Converters, and Controllers for Use in Independent Power Systems. First

11、 Edition May, 1999 Second Edition January 28, 2010 This UL Standard for Safety consists of the Second edition including revisions through March 23, 2016. 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 R

12、equest 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 those Standar

13、ds shall remain the sole and exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 28, 2010 UL 1741 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FUR

14、THER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .7 2 Glossary .7 3 General 11 3.1 Components .11 3.2 Units of measurement 12 3.3 References .12 CONSTRUCTION 4 General .12 5 Frame and Enclosure 12 5.1 General .12 5.2 Access covers 13 5.3 Cast metal enclosure

15、s .14 5.4 Sheet metal enclosures 14 5.5 Nonmetallic enclosures .17 5.6 Openings covered by glass .18 5.7 Openings for wiring system connections 18 5.8 Openings for ventilation 20 5.9 Environmental rated enclosures .26 6 Protection Against Corrosion .29 7 Mechanical Assembly 29 8 Mounting .30 9 Prote

16、ction of Users Accessibility of Uninsulated Live Parts 30 10 Protection of Service Personnel 34 11 Electric Shock .35 11.1 Voltage .35 11.2 Stored energy 37 12 Switches and Controls .40 13 Disconnect Devices 41 14 AC Output Connections 42 14.1 Stand-alone inverters .42 14.2 Utility-interactive inver

17、ters 42 15 Receptacles 43 16 Supply Connections .43 16.1 General .43 16.2 Wiring terminals .44 16.3 Wiring leads 46 16.4 Wiring compartments 47 16.5 Openings for conduit or cable connection 47 16.6 Openings for class 2 circuit conductors 48 17 Wire-Bending Space 48 18 Equipment Grounding 54 18.1 Gen

18、eral .54 18.2 Grounding electrode terminal .56 19 AC Output Circuit Grounded Conductor 56 20 Internal Bonding for Grounding 58 21 Internal Wiring 60 JANUARY 28, 2010 UL 1741 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 21.1 General .60 2

19、1.2 Protection of wiring 62 21.3 Electrical connections 62 22 Live Parts 63 23 Separation of Circuits 63 23.1 Factory wiring .63 23.2 Field wiring .64 23.3 Separation barriers 65 24 Spacings .65 24.1 General .65 24.2 Insulating liners and barriers 67 25 Alternate Spacings Clearances and Creepage Dis

20、tances .68 26 Insulating Materials 69 26.1 General .69 26.2 Barriers 70 27 Capacitors .70 28 Isolated Accessible Signal Circuits .71 29 Control Circuits 72 30 Overcurrent Protection .74 30.1 General .74 30.2 Control circuit overcurrent protection .76 30.3 Output ac power circuit overcurrent protecti

21、on 77 30.4 Battery circuits 77 31 DC Ground Fault Detector/Interrupter 78 32 Printed-Wiring Boards 80 33 External Transformers .80 PROTECTION AGAINST RISKS OF INJURY TO PERSONS 34 General 80 35 Enclosures and Guards 81 36 Moving Parts 81 37 Switches and Controls .82 38 Mounting .82 OUTPUT POWER CHAR

22、ACTERISTICS AND UTILITY COMPATIBILITY 39 General 82 40 Utility Interaction 82 PERFORMANCE 41 General 83 42 Maximum-Voltage Measurements .84 43 Temperature 84 44 Dielectric Voltage-Withstand Test 88A 45 Output Power Characteristics .90 45.1 General .90 45.2 Output ratings 90 45.3 Input range .91 45.4

23、 Harmonic distortion 91 46 Utility Compatibility 91 47 Abnormal Tests .91 JANUARY 28, 2010 UL 1741 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 47.1 General .91 47.2 Output overload test .93 47.3 Short-circuit test .94 47.4 DC input misw

24、iring test 94 47.5 Ventilation test 95 47.6 Component short- and open-circuit 95 47.7 Load transfer test .96 47.8 Loss of control circuit 96 48 Grounding Impedance Test 96 49 Overcurrent Protection Calibration Test 97 50 Strain Relief Test 97 51 Reduced Spacings on Printed Wiring Boards Tests 98 51.

25、1 General .98 51.2 Dielectric voltage-withstand test .98 51.3 Shorted trace test .98 52 Bonding Conductor Test .98 53 Voltage Surge Test 99 54 Calibration Test 100 55 Overvoltage Test .102 56 Current Withstand Test .102 57 Capacitor Voltage Determination Test .102 58 Stability .102 59 Static Load 10

26、3 60 Compression Test 103 61 Rain and Sprinkler Tests 103 61.1 General .103 61.2 Rain test 104 61.3 Sprinkler test 107 RATING 62 Details .109 MARKING 63 Details .110 64 Cautionary Markings 118 65 Equipment Information and Instructions .120 65.1 Separation of information 120 65.2 Operating and instal

27、lation instructions 120 66 Important Safety Instructions 121 MANUFACTURING AND PRODUCTION TESTS 67 Dielectric Voltage-Withstand Test 125 68 Utility Voltage and Frequency Variation Test .127 CHARGE CONTROLLERS INTRODUCTION 69 General 128 JANUARY 28, 2010 UL 1741 5UL COPYRIGHTED MATERIAL NOT AUTHORIZE

28、D FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 70 General 128 PERFORMANCE 71 General 129 72 Normal Operations .130 73 Temperature .131 74 Temperature Compensation .131 75 Connection Sequence 131 76 Abnormal Tests 132 76.1 General .132 76.2 Input and output faults

29、132 76.3 Charge controller miswiring 132 76.4 Low-voltage disconnect .133 MARKING 77 Cautionary Markings .133 78 Details 133 79 Important Safety Instructions .134 AC MODULES INTRODUCTION 80 General 134 CONSTRUCTION 81 General 135 PERFORMANCE 82 General 135 83 AC Module Inverter Securement Test .136

30、RATING 84 General 136 MARKING 85 Details .137 86 Important Safety Instructions .137 APPENDIX A Standards for ComponentsA1 JANUARY 28, 2010 UL 1741 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements c

31、over inverters, converters, charge controllers, and interconnection system equipment (ISE) intended for use in stand-alone (not grid-connected) or utility-interactive (grid-connected) power systems. Utility-interactive inverters, converters, and ISE are intended to be operated in parallel with an el

32、ectric power system (EPS) to supply power to common loads. 1.2 For utility-interactive equipment, these requirements are intended to supplement and be used in conjunction with the Standard for Interconnecting Distributed Resources With Electric Power Systems, IEEE 1547, and the Standard for Conforma

33、nce Test Procedures for Equipment Interconnecting Distributed Resources with Electric Power Systems, IEEE 1547.1. 1.3 These requirements cover AC modules that combine at-plate photovoltaic modules and inverters to provide AC output power for stand-alone use or utility-interaction, and power systems

34、that combine other alternative energy sources with inverters, converters, charge controllers, and interconnection system equipment (ISE), in system specic combinations. 1.4 These requirements also cover power systems that combine independent power sources with inverters, converters, charge controlle

35、rs, and interconnection system equipment (ISE) in system specic combinations. 1.5 The products covered by these requirements are intended to be installed in accordance with the National Electrical Code, NFPA 70. 2 Glossary 2.1 In the text of this standard, the term unit refers to any product covered

36、 by this Standard. For the purpose of this Standard, the denitions in 2.2 2.48 apply. 2.2 AC MODULE The smallest complete unit that includes solar cells, optics, inverters, and other components, excluding tracking devices, intended to generate ac power from sunlight. 2.3 BARRIER A part inside an enc

37、losure that reduces access to a part that involves a risk of re, electric shock, injury to persons, or electrical energy-high current levels. 2.4 BRANCH CIRCUIT The portion of the building wiring system beyond the nal overcurrent protective device in the power-distribution panel that protects the ac

38、 output of the eld-wiring terminals in a permanently connected unit. 2.5 BYPASS SOURCE A branch circuit or generator to which the load is connected when the power conversion portion of the inverter is not supplying power to the load. 2.6 CHARGE CONTROLLER A device intended to control the charging pr

39、ocess of storage batteries used in photovoltaic power systems. 2.7 CLASS 2 TRANSFORMER A step-down transformer complying with the applicable requirements in the Standard for Low Voltage Transformers Part 1: General Requirements, UL 5085-1, and the Standard for Low Voltage Transformers Part 3: Class

40、2 and Class 3 Transformers, UL 5085-3. 2.8 CONTROL CIRCUIT A circuit that carries low-voltage, limited-energy (LVLE) electric signals and not main power, voltage or current. JANUARY 28, 2010 UL 1741 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F

41、ROM UL 2.9 CONVERTER A device that accepts ac or dc power input and converts it to another form of ac or dc power. For the purposes of this standard and unless otherwise specied, ac output converters intended to directly supply power to loads are to be subjected to all of the requirements for invert

42、ers. 2.10 DC GROUND FAULT DETECTOR/INTERRUPTER A device that provides protection for photovoltaic arrays by detecting a ground fault and interrupting the fault path in the dc circuit. 2.11 DEGREE OF PROTECTION The extent of protection provided by an enclosure against access to parts which involve a

43、risk of injury to persons, ingress of foreign solid objects, and/or ingress of water as veried by standardized test methods. 2.12 DISCONNECT DEVICE A device that disconnects the conductors of a circuit from a supply, source, utility, or load. 2.13 ELECTRIC POWER SYSTEM (EPS) Equipment or facilities

44、that deliver electric power to a load. The most common example of an EPS is an electric utility. 2.14 ENCLOSURE A surrounding case constructed to provide a degree of protection against: a) The accessibility of a part that potentially involves a risk of re, electric shock or injury to persons, or b)

45、The risk of propagation of ame, sparks, and molten metal initiated by an electrical disturbance occurring within. 2.15 FIELD-WIRING LEAD A lead to which a supply, load, or other wire is intended to be connected by an installer. 2.16 FIELD-WIRING TERMINAL A terminal to which a supply, load, or other

46、wire is intended to be connected by an installer. 2.17 FIXED UNIT A unit that is intended to be permanently connected mechanically and electrically and only able to be detached by the use of a tool. 2.18 GROUNDED CONDUCTOR A system or circuit conductor that is intentionally grounded. 2.19 GUARD A pa

47、rt outside of the enclosure that reduces access to a component involving a risk of injury to persons. See Enclosures and Guards, Section 35. 2.20 INTERCONNECTION SYSTEM EQUIPMENT (ISE) A component or system of components that performs protective and control functions used to interconnect a distribut

48、ed resource to an EPS. 2.21 INVERTER An electronic device that changes dc power to ac power. 2.22 ISLANDING PROTECTION Protection against the continuous operation of the inverter and part of the utility load while isolated from the remainder of the electric utility system. 2.23 ISOLATED CIRCUIT A ci

49、rcuit having an isolation transformer or isolating components such as optically or magnetically coupled devices. JANUARY 28, 2010 UL 1741 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.24 ISOLATION TRANSFORMER A transformer having its primary winding electrically isolated from its secondary winding and constructed so that there is no electrical connection under normal and overload conditions between t