1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1558 Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL
2、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear, UL 1558 Fifth Edition, Dated February 18, 2016 SUMMARY OF TOPICS This revision of UL 1558 was issued to i
3、ncorporate the following changes to the standard: Editorial Revision of Requirements for Wire Bending Space in Table 16.2 The requirements are substantially in accordance with Proposal(s) on this subject dated April 28, 2017. Text that has been changed in any manner or impacted by ULs electronic pub
4、lishing system is marked with a vertical line in the margin. All rights reserved. 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 prov
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7、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, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error o
8、r deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. JUNE 23, 2017 UL 1558 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 23, 2017 UL 1558 tr2 No Text on This PageUL COPYRIGHTED
9、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 18, 2016 (Title Page Reprinted: June 23, 2017) 1 UL 1558 Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear First Edition June, 1983 Second Edition September, 1988 Third Editio
10、n October, 1993 Fourth Edition February, 1999 Fifth Edition February 18, 2016 This ANSI/UL Standard for Safety consists of the Fifth Edition including revisions through June 23, 2017. The most recent designation of ANSI/UL 1558 as an American National Standard (ANSI) occurred on June 23, 2017. ANSI
11、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 via a Proposal Request in ULs On-Line Collaborative Standards Development Syste
12、m (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 regarding those Standards shall remain the sole and exclusive property of UL. COPYRIG
13、HT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 1558-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 18, 2016 UL 1558 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT P
14、ERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Glossary .5 3 References .5 4 General 5 CONSTRUCTION 5 Accelerated Aging of Gaskets 9 6 Primary or Power Carrying Circuits 9 6.1 General .9 6.2 Bus bars 9 7 Grounding 11 8 Control and Secondary Wiring .14 8.1 General 14 8.2 Wiring terminals contro
15、l circuits 15 9 Location of Operating Means 15 10 Receptacles 16 11 Impact and Pressure Viewing Panes 16 12 Spacings 17 12.1 General .17 12.2 Details 17 12.3 Insulating barriers 22 12.4 Clamped joint 23 13 Service Equipment Use 23 13.1 General 23 13.2 Neutral disconnecting means 26 13.3 Equipment on
16、 supply side of disconnect 27 14 Multiple Source Switchgear 27 15 Corrosion Protection 27 16 Wiring Space .28 16.1 General .28 16.2 Wire bending space and gutter width .28 16.3 Clear wiring space 34 16.4 Wiring .35 17 Working Space .35 PERFORMANCE 18 General 35 MARKING 19 General .35 19.1 Details 35
17、 19.2 Location .35 19.3 Service equipment .36 19.4 Ground fault protection 37 19.5 Main devices 38 FEBRUARY 18, 2016 UL 1558 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 19.6 Emergency circuits .38 19.7 Transformers 38 19.8 Rainproof .38
18、 19.9 Taps 39 INSTALLATION INSTRUCTIONS 20 Field Testing of Ground-Fault Protection of Equipment 39 FEBRUARY 18, 2016 UL 1558 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover metal-enclosed l
19、ow-voltage power circuit breaker switchgear assemblies containing but not limited to such devices as low-voltage power circuit breakers, other interrupting devices, switches, control, instrumentation and metering, protective and regulating equipment. 1.2 These requirements cover equipment intended f
20、or use in ordinary locations in accordance with the National Electrical Code. 1.3 These requirements are intended to supplement and be used in conjunction with the Standard for Metal-Enclosed Low Voltage Power Circuit Breaker Switchgear, ANSI C37.20.1, and the Standard for Conformance Testing of Met
21、al-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies, ANSI C37.51. 1.4 These requirements cover equipment rated 1000 V ac or less nominal, 1058 V ac maximum. 2 Glossary 2.1 TAP A terminal or provision for a terminal intended for eld wiring that is located on the supply side of the
22、service disconnecting means. The tap is intended to be used in accordance with the National Electrical Code, ANSI/NFPA 70. 3 References 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 edition of that code
23、or standard. 4 General 4.1 Requirements for the equipment covered by this Standard are contained in the Standard for Metal-Enclosed Low-Voltage Circuit Breaker Switchgear, ANSI C37.20.1 and the Standard for Conformance Testing of Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assembl
24、ies, ANSI C37.51. The requirements in this Standard shall be applied in addition to those contained in the above documents, or as alternatives where so specied. 4.2 It is specically not intended that these requirements be used alone to evaluate these devices. 4.3 Figures 4.1 4.3 show typical switchg
25、ear layouts. It is recognized that other arrangements are possible. This is generated text for gtxt. NOVEMBER 7, 2016 UL 1558 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 4.1 Typical switchgear layout A. Utility Metering, see 13.2
26、.5. B. GFP Sensor (Zero Sequence Type), see 13.1.5 13.1.13. C. GFP Sensor (Residual Type), see 13.1.5 13.1.13. D. GFP Sensor (Ground Return Type), see 13.1.5 13.1.13. E. Neutral Disconnect Link, see 7.11, 13.1.5 13.1.13, and 13.2.1 13.2.5. (For other than ground return type GFP, the neutral disconne
27、ct link may be located on the line or load side of the GFP sensor.) F. Main Bonding Jumper, see 7.6. G. Ground Bus, see 7.1 7.8. H. Frame and Structure Grounding, see 7.2. I. Grounding Electrode Conductor, see 7.4 and 13.1.5 13.1.13. FEBRUARY 18, 2016 UL 1558 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED
28、FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 4.2 Typical double-ended switchgear a Other variations are possible. b Tie breaker disconnect. See 14.1 and 14.2. c The neutral bus and ground bus may be combined if ground return type ground fault protection is not used and
29、the sections are marked Suitable only for use as service equipment. d Ground return type ground fault protection sensor in accordance with 13.1.9. e Zero sequence or residual type ground fault protection sensor in accordance with 13.1.7 and 13.1.8. f Size of main bonding jumper based on largest serv
30、ice disconnect. FEBRUARY 18, 2016 UL 1558 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 4.3 Typical double-ended switchgear a Tie breaker disconnect. See 14.1 and 14.2. b Additional ground return type ground fault protection sensor
31、s utility interlocked with (d) so as to function only when fault current is also sensed by (d). c Size of main bonding jumper based on largest service disconnect. d Ground return type ground fault protection sensor in accordance with 13.1.9. e Zero sequence or residual type ground fault protection s
32、ensor in accordance with 13.1.7 and 13.1.8. FEBRUARY 18, 2016 UL 1558 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 5 Accelerated Aging of Gaskets 5.1 The requirements of this section are applicable to gaskets relied upon to
33、enable an enclosure to meet the rain test specied in 6.2.10 of ANSI C37.20.1-2002. 5.2 A gasket of an elastomeric or thermoplastic material or a composition gasket utilizing an elastomeric material employed to make an enclosure rainproof shall comply with 5.3 and 5.4. 5.3 If an enclosure is provided
34、 with a rubber or rubber-like gasket, samples of the gasket shall be subjected to a temperature of 70 1C (158 1.8F) in circulating air for 168 hours. The tensile strength after the exposure shall not be less than 60 percent and the elongation shall not be less than 75 percent of the values determine
35、d with unaged samples. 5.4 A gasket of thermoplastic material, or a composition thereof, may be accepted after consideration of the effects of heat aging, distortion under conditions of use, and the means of securing the gasket to the cover or enclosure. 6 Primary or Power Carrying Circuits 6.1 Gene
36、ral 6.1.1 The requirements of this section shall be applied in addition to those specied in 7.1.1 of ANSI C37.20.1-2002. 6.2 Bus bars 6.2.1 The bending of a bus bar shall not result in visible cracks, but roughening or slight surface crazing is acceptable. 6.2.2 A bolted joint involving aluminum bus
37、 bars shall comply with the requirements of 6.2.3 and 6.2.4, unless: a) A spring washer as described in 6.2.6 is used at one end of each bolt securing current- carrying parts together is used, or b) A locknut or a split-ring lock washer and a at washer as described in 6.2.5 is used and each aluminum
38、 bus in the joint has a tensile yield strength of at least 20,000 psi (138 MPa). c) A at washer, as described in 6.2.5, and aluminum bolts are used with aluminum bus bars. 6.2.3 A switchgear bus, as mentioned in 6.2.2, that employs a bolted joint construction with aluminum bus bars shall be subjecte
39、d to the test described in 6.2.4. The temperature rise at the joint during the 500th cycle shall not be more than 15C (27F) higher than the temperature rise at the 25th cycle. Exception: Constructions described in 6.2.2 (a), (b), or (c), need not comply with this requirement. FEBRUARY 18, 2016 UL 15
40、58 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.2.4 The test sample is to consist of an assembly of bus bars connected together to form a series circuit. The bus bars are to be clamped together with the joint construction used in actua
41、l production. The number and size of the bus bars are to represent the maximum ampere rating and the maximum current density in which the joint construction is to be employed. This may necessitate more than one test. The length of each bus bar is to be not less than 2 ft (610 mm). The bus bar is to
42、be connected to a power supply by any convenient means that will not affect the joint temperature. The power supply is to be adjusted to deliver a value of current that will result in a temperature of 75C (135F) above room temperature at the joint. The assembly is then to be subjected to a 500 cycle
43、 test. At the end of the 24th cycle, the current is to be readjusted to bring the temperature of the joint to 75C (135F) above room temperature. At the end of the 25th and 500th cycles, the temperatures are to be recorded. The temperatures are to be measured on both sides of the joint as close as po
44、ssible to the bolt. The cycling rate is to be 3 hours on and 1 hour off. The on period during which temperatures are recorded may be extended to more than 3 hours if necessary for the joint to attain thermal equilibrium. 6.2.5 The at washer mentioned in 6.2.2 (b) and (c) shall have a nominal thickne
45、ss of at least 1/6 that of the diameter of the bolt and shall have an outer diameter at least 150 percent of bolt and not less than the outer diameter of any spring washer employed. 6.2.6 A typical spring washer as mentioned in 6.2.2 is a dished washer of stainless, or hardened and tempered steel, h
46、aving an outer diameter not less than 150 percent of the bolt diameter, a thickness not less than 1/8 of the bolt diameter, and nominally dished not less than 3-1/2 percent of the bolt diameter. Other congurations are acceptable if they provide equivalent spring action. 6.2.7 A construction other th
47、an described in 6.2.2 may be accepted if it is investigated and found acceptable for the particular application. 6.2.8 Unless investigated for such use, a bolted connection between two bus bars or between a bus bar and another current carrying part shall not depend on any polymeric insulation to mai
48、ntain the clamping force and shall not depend on thermoplastic material in any case. 6.2.9 When bolts, nuts, and washers are provided for connecting through bus to other sections, the length of the bolts shall be such that spacings in accordance with Table 12.1 are maintained. 6.2.10 A bus bar or un
49、insulated live part, other than a pressure wire connector as mentioned in the Exception of 12.2.7, shall be secured so that ordinary vibration will not loosen the securing means, and shall be prevented from turning or shifting in position if any spacings less than half those indicated in Table 12.1 would result from such turning or shifting. A bus bar provided with one or more insulators that must be removed when a unit is installed shall be prevented from any turning that would result
