1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 508A Industrial Control Panels STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHOR
2、IZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Industrial Control Panels, UL 508A Second Edition, Dated December 20, 2013 Summary of Topics These revision pages of the Standard for Safety for Industrial Control Panels, UL 508A includes editorial c
3、orrections and the following proposals: a) Industrial Control Panels for Load Management Applications b) Adding UL 60730 Standard for XAPX and XAPX2 in Supplement SA c) Table SA1.1 Section 26. Allow ACVS2 and LZFE2 to be used without procedure description when installed per the manufacturing instruc
4、tions d) Allow an environmental Type rated wireway to interface the same Type rated enclosure without procedure description. e) Editorial Correction to 66.7.5 f) Editorial Correction to 66.7.1 g) Alternate standard for Recognized plugs and receptacles h) Table SB4.4 Three phase transformer secondary
5、 available short circuit currents The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated February 26, 2016. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, elec
6、tronic, 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
7、 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 or an authorized UL representative has been advised of the possibilit
8、y 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, indemnify, and hold UL harmless from and against any loss, expense, liabil
9、ity, 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. AUGUST 3, 2016 UL 508A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DIS
10、TRIBUTION WITHOUT PERMISSION FROM UL AUGUST 3, 2016 UL 508A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 20, 2013 (Title Page Reprinted: August 3, 2016) 1 UL 508A Standard for Industrial Control Panels Fir
11、st Edition April, 2001 Second Edition December 20, 2013 The revised requirements are substantially in accordance with Proposal(s) on this subject dated February 26, 2016. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted
12、 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 electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regard
13、ing those Standards 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 DECEMBER 25, 2013 INDUSTRIAL CONTROL PANELS - UL 508A 2 No Text on This Page
14、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PART 1 GENERAL USE INDUSTRIAL CONTROL PANELS INTRODUCTION 1 Scope 10 2 Glossary 12 3 Undated References .15 4 Components 15 5 Units of Measurement 16 6 Terminology .16 CONSTRUCTION ALL
15、 PANELS 7 General .19 8 Protection Against Corrosion 19 9 Support and Securement of Live Parts .19 10 Spacings 20 11 Conduit Bushings 22 12 Insulating Barriers .23 13 Insulating Materials 24 14 Grounding General 25 15 Grounding Size of Terminal or Bonding Conductor .26 16 Transformer and Power Suppl
16、y Secondary Grounding .27 17 Identication of Grounding and Grounded Circuit Conductors and Terminals 28 ENCLOSED PANELS 18 Enclosures .29 19 Enclosure Openings .30 20 Accessibility of Live Parts 32 21 Ventilation Openings .33 21.1 General .33 21.2 Location of ventilation opening 34 21.3 Construction
17、 34 22 Barriers Used with Ventilation Openings .35 23 Observation Windows 36 24 Bonding 36 25 Wire Bending Space .37 26 Enclosure Environmental Control Devices 38 26.1 General 38 26.2 Enclosure fans 38 26.3 Enclosure air conditioner .39 26.4 Enclosure heater 39 26.5 Air lters .39 26.6 Enclosure ther
18、mal insulation 40 27 Enclosure Maintenance Lighting 40 27.1 General .40 DECEMBER 25, 2013 INDUSTRIAL CONTROL PANELS - UL 508A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 27.2 Component requirements 40 27.3 Circuit requirements .40 POWER
19、 CIRCUITS 28 Field Wiring 41 28.1 General .41 28.2 Component requirements 41 28.3 Sizing 42 28.4 Separation of circuits 44 28.5 Cord-connected equipment .45 28.6 Receptacles 47 29 Internal Wiring 48 29.1 General .48 29.2 Conductor requirements 48 29.3 Wiring methods .49 29.4 Routing of internal wiri
20、ng .51 29.5 Separation of circuits 51 29.6 Sizing 52 30 Disconnect Switches 52 30.1 Component requirements .52 30.2 Sizing of disconnect switch .53 30.3 Location 54 30.4 Mechanical operating mechanism .55 31 Branch Circuit Protection .55 31.1 Component requirements .55 31.2 Location 56 31.3 Sizing o
21、f branch circuit protection for single motor circuit .57 31.4 Sizing of branch circuit protection for motor groups 59 31.5 Receptacles 61 31.6 Sizing of branch circuit protection for heater loads .61 31.7 Sizing of branch circuit protection for appliance loads 62 31.8 Sizing of branch circuit protec
22、tion for lighting loads 62 32 Overcurrent Protection of Feeder .63 32.1 Component requirements .63 32.2 Location 63 32.3 Sizing of overcurrent protection .63 33 Load Controllers 63 33.1 Component requirements .63 33.2 Sizing/rating of load controllers 64 33.3 Location 65 33.4 Reversing motor control
23、lers .65 33.5 Wye-delta motor controllers 65 33.6 Controllers for multi-speed and part winding motors .68 33.7 Autotransformer- and resistor-type reduced voltage motor controllers 68 34 Overload Protection of Motor Loads .68 34.1 Component requirements .68 34.2 Sizing of overload relay 68 34.3 Locat
24、ion 69 35 Power Transformers .70 35.1 Component requirements .70 35.2 Sizing of overcurrent protection for power transformer .70 35.3 Location 72 DECEMBER 25, 2013 INDUSTRIAL CONTROL PANELS - UL 508A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION
25、FROM UL 36 Other Circuit Components 72 36.1 Capacitors 72 36.2 Resistors .73 36.3 Surge control devices 73 CONTROL CIRCUITS 37 Field Wiring Terminals .74 37.1 Component requirements .74 37.2 Sizing 74 37.3 Field wiring terminals of a low-voltage limited energy circuit 75 37.4 Field wiring terminals
26、of Class 2 circuits 75 37.5 Separation of circuits 75 37.6 Receptacles 75 37.7 Flexible cords .75 38 Internal Wiring 76 38.1 Component requirements .76 38.2 Sizing of internal control circuit conductors .76 38.3 Wiring methods, wire routing, and separation of circuits for internal wiring of a contro
27、l circuit 77 39 Disconnecting Means 77 40 Overcurrent Protection .77 40.1 Component requirements .77 40.2 Location of overcurrent protective devices 77 40.3 Sizing of overcurrent protection .78 41 Sizing of Overcurrent Protection Control Circuits (Common) 79 42 Overcurrent Protection Control Circuit
28、s (Isolated Secondary) 80 42.1 Control transformers .80 42.2 Power supplies .81 42.3 Other isolated secondary sources .82 43 Low-Voltage Limited Energy Circuits 83 43.1 Component requirements .83 43.2 Secondary side requirements .84 44 Class 2 Circuits .84 44.1 Component requirements 84 44.2 Seconda
29、ry side requirements .85 45 Switching Devices .85 45.1 Component requirements .85 45.2 Sizing/ratings of control circuit switching devices 86 45.3 Location 88 45.4 Undervoltage protection 89 46 Loads .89 46.1 Component requirements .89 46.2 Location 90 46.3 Rating of control circuit load 90 47 Misce
30、llaneous Devices 91 47.1 Surge control devices 91 47.2 Resistors .91 48 Pneumatic Switching Devices 91 DECEMBER 25, 2013 INDUSTRIAL CONTROL PANELS - UL 508A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL RATING 49 Supply Ratings .91 50 Ind
31、ividual Load Ratings 92 51 Ratings for Control Circuit Outputs 95 MARKINGS 52 General Markings .95 53 Enclosure Markings 98 54 Field Wiring Terminal Markings .98 55 Cautionary Markings 102 56 Fuseholder Markings .103 57 Switch Markings 103 58 Overload Relay Heater Table Markings .103 59 Receptacle M
32、arkings .104 60 Field Provided Components .104 61 Schematic Wiring Diagrams .104 PART 2 SPECIFIC USE INDUSTRIAL CONTROL PANEL TYPES ENCLOSURES 62 General 105 63 Construction .105 63.1 Metal thickness .105 63.2 Covers and doors 110 63.3 Corrosion protection 114 63.4 Enclosure openings 114 63.5 Ventil
33、ation openings 114 63.6 Observation windows .114 64 Markings 114 INDUSTRIAL MACHINERY 65 General 114 66 Construction .115 66.1 Enclosures .115 66.2 Electrical assembly .116 66.3 Grounding .116 66.4 Field wiring power circuits .117 66.5 Internal wiring power circuits .118 66.6 Disconnecting means .11
34、9 66.7 Branch circuit protection 120 66.8 Motor controllers .121 66.9 Internal wiring of control circuit .122 66.10 Overcurrent protection of common control circuit 123 66.11 Operator controls 123 67 Markings 123 67.1 Nameplate markings 123 67.2 Operator controls 124 67.3 Components .124 DECEMBER 25
35、, 2013 INDUSTRIAL CONTROL PANELS - UL 508A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 67.4 Cautionary marking .124 CRANE CONTROL 68 General 125 69 Glossary 125 70 Construction .125 70.1 Field wiring terminals of power circuits 125 70.2
36、 Internal wiring 126 70.3 Disconnecting means .127 70.4 Branch circuit protection 127 70.5 Motor overload protection .128 70.6 Field wiring of control circuits 128 70.7 Overcurrent protection of control circuit .128 71 Ratings .128 72 Markings 128 SERVICE EQUIPMENT USE 73 General 129 74 Glossary 129
37、 75 Construction .130 75.1 Grounding and bonding .130 75.2 Spacings 137 75.3 Field wiring terminals .137 75.4 Disconnecting means .137 75.5 Neutral disconnecting means 137 75.6 Ground-fault protection .138 75.7 Overcurrent protection 142 75.8 Components on the supply side of the disconnecting means
38、142 76 Ratings .143 77 Markings .143 77.1 Bonded neutral .143 77.2 Insulated neutral .144 77.3 Marking location .144 77.4 Disconnects .144 77.5 Ground-fault protection .144 78 Installation Instructions .145 79 Tests By The Manufacturer Ground-Fault Protection Test .146 ELEVATOR CONTROL 80 General 14
39、6 FLAME CONTROL 81 General 147 82 Construction .147 82.1 Component requirements 147 82.2 Spacings 147 82.3 Internal wiring 148 82.4 Location 148 82.5 Separation of circuits .148 DECEMBER 25, 2013 INDUSTRIAL CONTROL PANELS - UL 508A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
40、DISTRIBUTION WITHOUT PERMISSION FROM UL 82.6 Overcurrent protection 148 83 Marking .148 MARINE USE 84 General 149 85 Construction .149 85.1 Enclosures .149 85.2 Autotransformer starters 150 85.3 Insulating materials .150 85.4 Branch circuit overcurrent devices 150 86 Ratings .150 87 Markings 150 AIR
41、 CONDITIONING AND REFRIGERATION EQUIPMENT 88 General 150 89 Glossary 151 90 Construction .151 90.1 Field wiring sizing power circuit .151 90.2 Disconnecting switches power circuits 151 90.3 Branch circuit protection sizing power circuits 151 90.4 Load controllers power circuits .152 91 Ratings .152
42、92 Marking .152 FOUNTAIN CONTROL PANELS 93 General 153 94 Construction .153 94.1 Grounding .153 94.2 Ground fault protection 153 94.3 Equipotential bonding .154 94.4 Cord strain relief .154 95 Ratings .154 96 Marking .154 INDUSTRIAL CONTROL PANELS FOR IRRIGATION EQUIPMENT 97 General 155 98 Construct
43、ion .155 98.1 Sizing of motor controller 155 98.2 Disconnecting means .155 98.3 Branch circuit protection 155 98.4 Internal conductors .156 99 Marking .156 DECEMBER 25, 2013 INDUSTRIAL CONTROL PANELS - UL 508A 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT P
44、ERMISSION FROM UL SUPPLEMENT SA - SPECIFIC COMPONENT REQUIREMENTS COMPONENT REQUIREMENTS SA1 Listed Components SA1 SA2 Recognized Components SA21 SA3 Other Components .SA22 SUPPLEMENT SB - SHORT CIRCUIT CURRENT RATINGS FOR INDUSTRIAL CONTROL PANELS SB1 Scope SB1 SB2 Glossary SB1 SB3 Construction SB1
45、 SB3.1 Internal wiring connections .SB1 SB3.2 Overcurrent protection of control circuit SB1 SB4 Ratings .SB2 SB4.1 Short circuit current rating SB2 SB4.2 Short circuit current ratings of individual power circuit components SB2 SB4.3 Feeder components that limit the short circuit current available .S
46、B6 SB4.4 Determination of the overall short circuit current rating of the panel SB11 SB5 Markings SB12 SB5.1 General .SB12 SB5.2 Cautionary markings SB12 APPENDIX A Standards for ComponentsA1 APPENDIX B USE OF COMPONENTS NOT UL LISTED OR RECOGNIZED IN INDUSTRIAL CONTROL PANELS B1 Scope .B1 B2 Condit
47、ions of Use B2 B2.1 Enclosures B2 B2.2 Power supplies B4 B2.3 Inputs B5 B2.4 Outputs .B5 B3 Responsibility of the Manufacturer B6 AUGUST 3, 2016 INDUSTRIAL CONTROL PANELS - UL 508A 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PART 1 GENE
48、RAL USE INDUSTRIAL CONTROL PANELS INTRODUCTION 1 Scope 1.1 These requirements cover industrial control panels intended for general industrial use, operating from a voltage of 600 volts or less. This equipment is intended for installation in ordinary locations, in accordance with the National Electri
49、cal Code, ANSI/NFPA 70, where the ambient temperature does not exceed 40C (104F) maximum. 1.2 These requirements also cover industrial control panel enclosures and industrial control panels primarily intended for ame safety supervision of combustible fuel type equipment, elevator control, crane or hoist control, service equipment use, marine use, air conditioning and refrigeration equipment, equipment for load management applications, fountain control, irrigation equipment control, and for control of
