UL 508A-2018 UL Standard for Safety Industrial Control Panels (Third Edition Reprint with revisions through and including July 3 2018).pdf
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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 Third Edition, Dated April 24, 2018 Summary of Topics This revision of ANSI/UL 508A is being issued to reect the rst time ANSI approval of the Standard. Text that ha
3、s been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated May 18, 2018. All rights reserved. No part of this publication may be rep
4、roduced, 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 implied, including but not limited to, the im
5、plied 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 of or the inability to use this Standa
6、rd, even if UL 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 t
7、o 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 or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. JULY 3, 2018
8、 UL 508A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 3, 2018 UL 508A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 24, 2018 (Title Page Re
9、printed: July 3, 2018) 1 UL 508A Standard for Industrial Control Panels First Edition April, 2001 Second Edition December, 2013 Third Edition April 24, 2018 This ANSI/UL Standard for Safety consists of the Third Edition including revisions through July 3, 2018. The most recent designation of ANSI/UL
10、 508A as an American National Standard (ANSI) occurred on July 3, 2018. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. Any other portions of this ANSI/UL standard that were not processed in accordance with ANSI/UL requirements are noted at the beginn
11、ing of the impacted sections. 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 System (CSDS) at https:/. ULs Standards for Safety are copyrighted
12、 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. COPYRIGHT 2018 UNDERWRITERS LABORATORIES INC. ANSI/UL 508A-2018UL CO
13、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 24, 2018 INDUSTRIAL CONTROL PANELS - UL 508A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PART 1 GE
14、NERAL USE INDUSTRIAL CONTROL PANELS INTRODUCTION 1 Scope 11 2 Glossary 13 3 Undated References .18 4 Components 18 5 Units of Measurement 18 6 Terminology .19 CONSTRUCTION ALL PANELS 7 General .22 8 Protection Against Corrosion 22 9 Support and Securement of Live Parts .22 10 Spacings 23 11 Conduit
15、Bushings .25 12 Insulating Barriers 26 13 Insulating Materials .27 14 Grounding General 28 15 Grounding Size of Terminal or Bonding Conductor 29 16 Transformer and Power Supply Secondary Grounding 30 17 Identication of Grounding and Grounded Circuit Conductors and Terminals .31 ENCLOSED PANELS 18 En
16、closures .32 19 Enclosure Openings .33 20 Accessibility of Live Parts 35 21 Ventilation Openings 36 21.1 General .36 21.2 Location of ventilation opening .37 21.3 Construction .37 22 Barriers Used with Ventilation Openings .38 23 Observation Windows .39 24 Bonding .39 25 Wire Bending Space 40 26 Enc
17、losure Environmental Control Devices .41 26.1 General 41 26.2 Enclosure fans .41 26.3 Enclosure air conditioner 41 26.4 Enclosure heater .42 26.5 Air lters 42 26.6 Enclosure thermal insulation .42 27 Enclosure Maintenance Lighting 43 27.1 General .43 APRIL 24, 2018 INDUSTRIAL CONTROL PANELS - UL 508
18、A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 27.2 Component requirements 43 27.3 Circuit requirements 43 POWER CIRCUITS 28 Field Wiring 44 28.1 General .44 28.2 Component requirements 44 28.3 Sizing .45 28.4 Separation of circuits .48
19、28.5 Cord-connected equipment 48 28.6 Receptacles .50 28.7 Cable assemblies and ttings 51 29 Internal Wiring 51 29.1 General .51 29.2 Conductor requirements .52 29.3 Wiring methods 53 29.4 Routing of internal wiring 55 29.5 Separation of circuits .56 29.6 Sizing .56 30 Disconnect Switches 57 30.1 Co
20、mponent requirements 57 30.2 Sizing of disconnect switch 58 30.3 Location .59 30.4 Mechanical operating mechanism 60 31 Branch Circuit Protection 60 31.1 Component requirements 60 31.2 Location .61 31.3 Sizing of branch circuit protection for single motor circuit 62 31.4 Sizing of branch circuit pro
21、tection for motor groups .64 31.5 Receptacles .66 31.6 Sizing of branch circuit protection for heater loads 66 31.7 Sizing of branch circuit protection for appliance loads .67 31.8 Sizing of branch circuit protection for lighting loads .67 32 Overcurrent Protection of Feeder .68 32.1 Component requi
22、rements 68 32.2 Location .68 32.3 Sizing of overcurrent protection 68 32.4 Feeder taps for non-motor loads .68 32.5 Feeder taps for motor loads .69 33 Load Controllers 70 33.1 Component requirements 70 33.2 Sizing/rating of load controllers .70 33.3 Location .71 33.4 Reversing motor controllers 72 3
23、3.5 Wye-delta motor controllers .72 33.6 Controllers for multi-speed and part winding motors 75 33.7 Autotransformer- and resistor-type reduced voltage motor controllers .75 34 Overload Protection of Motor Loads .75 34.1 Component requirements 75 34.2 Sizing of overload relay .75 34.3 Location .76 3
24、5 Power Transformers 77 APRIL 24, 2018 INDUSTRIAL CONTROL PANELS - UL 508A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 35.1 Component requirements 77 35.2 Sizing of overcurrent protection for power transformer 77 35.3 Location .79 36 Ot
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