1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 3730 Photovoltaic Junction Boxes STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTH
2、ORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Photovoltaic Junction Boxes, UL 3730 First Edition, Dated November 11, 2014 Summary of Topics The revisions dated March 27, 2017 were issued to incorporate the Expansion of UL 3730 to Include Juncti
3、on Boxes up to 1500 V dc or Less. The new requirements are substantially in accordance with Proposal(s) on this subject dated February 17, 2017. 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.
4、 No part of this publication may be reproduced, stored 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 implie
5、d, including but not limited to, the implied warranties 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
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8、urchasers computer system. MARCH 27, 2017 UL 3730 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 27, 2017 UL 3730 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMI
9、SSION FROM UL NOVEMBER 11, 2014 (Title Page Reprinted: March 27, 2017) 1 UL 3730 Standard for Photovoltaic Junction Boxes First Edition November 11, 2014 This ANSI/UL Standard for Safety consists of the First Edition including revisions through March 27, 2017. The most recent designation of ANSI/UL
10、3730 as an American National Standard (ANSI) occurred on March 27, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted
11、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 electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regard
12、ing those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 3730-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 11, 2014 PHOTOVOLTAIC JUNCTION BOXES - UL 3730 2
13、No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 General 5 2.1 Components 5 2.2 Units of measurement .6 2.3 References 6 3 Glossary .6 CONSTRUCTION 4 Enclosure and Materials .7 4.1 Genera
14、l 7 4.2 Nonmetallic enclosures and polymeric materials 8 4.3 Openings for wiring system connections 10 5 Protection Against Corrosion 11 6 Protection of Users - Accessibility of Uninsulated Live Parts 12 7 Wiring Terminals 12 8 Wiring Leads 14 9 Field Wiring Compartments .14 10 Grounding .14 11 Inte
15、rnal Bonding for Grounding 16 12 Internal Wiring 17 13 Protection of Wiring 18 14 Electrical Connections .18 15 Live Parts 19 16 Spacings .19 17 Barriers 20 18 Connectors .20 19 Printed-Wiring Boards 20 PERFORMANCE 20 General 21 21 Temperature Test .22 22 Dielectric Voltage-Withstand Test 23 23 Leak
16、age Current Test 23 24 Mold Stress-Relief Distortion Test .24 25 Strain Relief Test 25 26 Crush Test .25 27 Push Test 26 28 Impact Test .26 29 Terminal Torque Test 27 30 Grounding Impedance Test .27 31 Bonding Conductor Test 27 32 Compression Test .28 33 Gasket Tests .29 33.1 General .29 33.2 Altern
17、ate gasket tests .30 34 Corrosive Atmosphere Test 31 NOVEMBER 11, 2014 PHOTOVOLTAIC JUNCTION BOXES - UL 3730 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 34.1 Salt spray test .31 34.2 Moist carbon dioxide/sulphur dioxide test 32 35 Metal
18、lic Coating Thickness Test 33 36 Water Spray Test (Optional) 34 37 Wet Insulation-Resistance Test (Optional) 35 38 Temperature Cycling Test (Optional) .35 39 Humidity Cycling Test (Optional) 36 RATING 40 Details .37 MARKING 41 Details .37 42 Installation and Assembly Instructions 38 APPENDIX A Stand
19、ards for ComponentsA1 NOVEMBER 11, 2014 PHOTOVOLTAIC JUNCTION BOXES - UL 3730 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover photovoltaic junction boxes intended to be attached to photovolt
20、aic modules and panels. 1.2 These requirements cover photovoltaic junction boxes intended for factory and eld wiring and may include conduit openings, wiring leads, and/or photovoltaic connectors intended for interconnection of PV modules. 1.3 The products covered by these requirements are intended
21、to be installed in accordance with the National Electrical Code, ANSI/NFPA 70. 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, 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 compone
22、nts generally used in the products covered by this standard. 2.1.2 A component 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 requirem
23、ent in this standard. 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited condi
24、tions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. NOVEMBER 11, 2014 PHOTOVOLTAIC JUNCTION BOXES - UL 3730 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.2 Units of mea
25、surement 2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.3 References 2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edit
26、ion of that code or standard. 3 Glossary 3.1 In the text of this standard, the term unit refers to any product covered by this standard. For the purpose of this standard, the denitions in 3.2 3.18 apply. 3.2 AC MODULE The smallest complete unit that includes solar cells, optics, inverters, and other
27、 components, excluding tracking devices, intended to generate ac power from sunlight. 3.3 BARRIER A part inside an enclosure that reduces access to a part that involves a risk of re, electric shock, injury to persons, or electrical energy-high current levels. 3.4 ELECTRIC SHOCK - VOLTAGE A live part
28、 does not involve a risk of electric shock when the maximum voltage of the part to ground does not exceed 30 Vdc. 3.5 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
29、 persons, or b) The risk of propagation of ame, sparks, and molten metal initiated by an electrical disturbance occurring within. 3.6 FIELD-WIRING LEAD A lead to which a supply, load, or other wire is intended to be connected by an installer. 3.7 FIELD-WIRING TERMINAL A terminal to which a supply, l
30、oad, or other wire is intended to be connected by an installer. 3.8 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. 3.9 GROUNDED CONDUCTOR A system or circuit conductor that is intentionally grounded. 3.1
31、0 KNOCKOUT A portion of the wall of an enclosure so fashioned that it is capable of being readily removed by a hammer, screwdriver, and pliers at the time of installation in order to provide an opening or hole for the attachment of an auxiliary device, raceway, cable, or tting. 3.11 LIVE PART An ele
32、ctrically conductive part within a unit that during intended use has a potential difference with respect to earth ground. 3.12 MAXIMUM SYSTEM VOLTAGE The sum of the open-circuit voltage (Voc) of the photovoltaic module or panel multiplied by the temperature correction factor specied in Article 690.7
33、 of the National Electrical Code, ANSI/NFPA 70 for the maximum number of crystalline and multi-crystalline silicon NOVEMBER 11, 2014 PHOTOVOLTAIC JUNCTION BOXES - UL 3730 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL photovoltaic modules
34、and panels in a series string. The maximum system voltage is equal to the sum of the Voc for the maximum number of amorphous silicon and thin lm photovoltaic modules and panels in a series string. 3.13 OPEN-CIRCUIT VOLTAGE (Voc) The maximum no load output voltage of a photovoltaic module or panel at
35、 standard test conditions (STC). 3.14 PERMANENTLY CONNECTED UNIT A unit connected to the electrical supply by means other than a supply cord and an attachment plug. 3.15 PRESSURE TERMINAL CONNECTOR A terminal that accomplishes the connection of one or more conductors by means of pressure without the
36、 use of solder. Examples of pressure terminal connectors are: a) Barrel and setscrew type, b) Crimp-type barrel, or c) Clamping plate and screw type. 3.16 SERVICE PERSONNEL Trained persons having familiarity with the construction and operation of the equipment and the risks involved. 3.17 STANDARD T
37、EST CONDITIONS (STC) Test conditions consisting of: a) 100 mW/cm 2 irradiance, b) AM 1.5 spectrum, and c) 25C (77F) cell temperature. 3.18 TOOL A screwdriver, coin, key, or any other object that is usable to operate a screw, latch, or similar fastening means. CONSTRUCTION 4 Enclosure and Materials 4
38、.1 General 4.1.1 Photovoltaic junction boxes shall be considered an enclosure or be provided with an enclosure that houses all current-carrying parts. The enclosure shall protect the various parts of the unit against mechanical damage from forces external to the unit. The parts of the enclosure that
39、 are required to be in place to comply with the requirements to reduce the risk of re, electric shock, injury to persons shall comply with the applicable enclosure requirements specied in this standard. NOVEMBER 11, 2014 PHOTOVOLTAIC JUNCTION BOXES - UL 3730 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED F
40、OR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4.1.2 The frame or chassis of a junction box shall not be relied upon to carry current during normal operation. 4.1.3 A part, such as a nameplate that is a part of the enclosure shall comply with the enclosure requirements. 4.1.4 She
41、et-metal screws threading directly into metal shall not be used to attach a cover, door, or other part that is to be removed to install eld wiring or for operation of the equipment. Machine screws, self-tapping machine screws, and thread forming screws are able to thread directly into sheet-metal wh
42、en they allow for at least two full threads of screw engagement. 4.1.5 Sheet-metal screws mounting internal components that are not removed for installation or operation are able to thread directly into metal. 4.2 Nonmetallic enclosures and polymeric materials 4.2.1 A polymeric enclosure or polymeri
43、c part of an enclosure shall comply with Sections 7 and 34 in the Standard for Flat-Plate Photovoltaic Modules and Panes, UL 1703, except as noted by the following. 4.2.2 With reference to paragraph 7.2 (c) of the Standard for Flat-Plate Photovoltaic Modules and Panes, UL 1703, a polymeric material
44、serving as the support or insulation of a live part as dened in Table 6.1 of the Standard for Polymeric Materials Use in Electrical Equipment Evaluations, UL 746C, shall have a Comparative Tracking Index performance level category (PLC) as determined in accordance with the Standard for Polymeric Mat
45、erials - Short Term Property Evaluations, UL 746A, and as dened in Table 4.1, when the system voltage rating is 600 V or less. Exception No. 1: The CTI rating is not required for a polymeric material serving as the support or insulation of a live part as dened in UL 746C, Table 6.1, when both the ma
46、terial and live part are completely encapsulated by the potting material such that there is no surface upon which tracking may occur, and the potting material has been evaluated according to UL 746C, Table 6.1, for Electric Strength, Resistance to Electrical Ignition Sources (HAI and HWI), and Therm
47、al Endurance. Exception No. 2: The CTI rating is not required for a polymeric material serving as the support or insulation of a live part as dened in UL 746C, Table 6.1, when both the material and live part are completely coated by a conformal coating that has been evaluated to the requirements of
48、UL 746C, Section 43, at the rated thickness such that there is no surface upon which tracking may occur. Exception No. 3: Silicone based RTV when applied in accordance with Exception No. 2 is considered a suitable conformal coating without further evaluation. NOVEMBER 11, 2014 PHOTOVOLTAIC JUNCTION
49、BOXES - UL 3730 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 4.1 Determination of comparative tracking index performance level category (PLC) Voltage Creepage distance IPT 1 hr rating required CTI PLC of 2 or better required 0 30 Any No No 30 600 3 06 0 0 12.7 mm No No 600 1000 600 1000 16.0 mm No No 1000 1500 1000 1500 24.0 mm No No Note - Voltage is determined as follows: Between live parts
