NEMA PB 2 1-2013 GENERAL INSTRUCTIONS FOR PROPER HANDLING INSTALLATION OPERATION AND MAINTENANCE OF DEADFRONT DISTRIBUTION SWITCHBOARDS RATED 600 VOLTS OR LESS.pdf
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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/NEMA PB 2.1-2013General Instructions for Proper Handling, Installation, Operation, and Maintenance of Deadfront Distribution Switchboards Rated 600 Volts or LessANSI/NEMA PB 2.1-2013 General Instructions for Proper Handling,
2、 Installation, Operation, and Maintenance of Deadfront Distribution Switchboards Rated 600 Volts or Less Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 www.nema.org Approved: September 13, 2013 2014 National Electrical Manufacture
3、rs Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American copyright conventions. 2014 National Electrical Manufacturers Asso
4、ciation NOTICE AND DISCLAIMER (ANSI Accredited Standards Committee) The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is
5、 unanimous agreement among every person participating in the development of this document. ANSI standards, of which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of p
6、ersons who have an interest in the topic covered by this publication. As Secretary of the ANSI Accredited Standards Committee, NEMA administers the process in accordance with the procedures of the American National Standards Institute to promote fairness in the development of consensus. As a publish
7、er of this document, NEMA does not write the document and it does not independently test, evaluate or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, prop
8、erty or other damages of any nature whatsoever, whether special, indirect, consequential or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, express or implied, as to the accuracy
9、 or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any individual manufacturers or sellers products or services
10、by virtue of this standard or guide. In publishing and making this document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or entity. Nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using thi
11、s document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Information and other standards on the topic covered by this publication may be available from othe
12、r sources, which the user may wish to consult for additional views or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this document. NEMA does not certify, test or inspect products, designs or installations fo
13、r safety or health purposes. Any certification or other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. PB 2.1-2013 Page i 2014 National Electrical Man
14、ufacturers Association TABLE OF CONTENTS Page Foreword iv Section 1 GENERAL 1 1.1 Scope . 1 1.2 References 1 1.3 General 1 1.3.1 Successful Operation 2 1.3.2 Qualified Personnel . 2 1.3.3 Definition of Qualified Personnel . 2 Section 2 HANDLING 3 2.1 Manufacturers Handling Instructions 3 2.2 Care to
15、 Avoid Damage 3 2.3 Upright Position . 3 2.4 Equipment Capacity . 3 2.5 Concealed Damage . 3 2.6 Storage Prior to Installation . 3 2.7 Shipping Skid . 3 2.8 Rod or Pipe Rollers 3 2.9 Forklift Truck 3 2.10 Overhead Hoisting . 4 2.10.1 Rigid Spreaders or Spanner Bars . 4 2.10.2 Rigging Lengths. 4 2.10
16、.3 Angle Between Lifting Cables and Vertical 4 2.10.4 Slings With Safety Hooks or Shackles 4 2.10.5 Removal of Switchboard Top Covers 4 Section 3 STORAGE . 7 3.1 Clean, Dry Space Having Uniform Temperature . 7 3.2 Protection from Weather and Dirt 7 3.3 Outdoor Switchboards are Not Weather Resistant
17、Until Installed . 7 3.4 Un-Energized Outdoor Switchboard Should Be Kept Dry Internally 7 Section 4 INSTALLATION OF SWITCHBOARD OR ENCLOSURE 8 4.1 Manufacturers Installation Instructions . 8 4.2 Location . 8 4.2.1 Clearance from Walls 8 4.2.2 Working Clearances 8 4.3 Channel Sills 8 4.4 Conduit and O
18、ther Raceways 8 4.5 Leveling and Securing . 8 4.6 Splice Bus 8 4.7 Grounding and Bonding . 9 4.7.1 Grounded Systems 9 4.7.2 Ungrounded SystemsService Equipment or Separately Derived System Main. 9 4.7.3 Grounded or Ungrounded Systems . 9 4.8 Unused Openings 10 4.9 Damp Indoor Locations 10 4.10 Unusu
19、al Service Conditions . 10 Section 5 INSTALLATION OF CONDUIT AND CONDUCTORS . 11 5.1 Prevent Moisture or Water from Entering 11 5.2 Temperature Ratings . 11 5.3 Compression (Crimp) Terminals . 11 5.4 Stripping Insulation from Conductors 11 5.5 Proper Wiring Methods 11 PB 2.1-2013 Page ii 2014 Nation
20、al Electrical Manufacturers Association 5.6 Conductor Location in Switchboard . 11 5.7 Conductors 1/0 AWG in Size and Larger 11 5.8 Incoming and Outgoing Control Connections 12 5.9 Prevent Conductor Insulation from Cracking or Splitting . 12 5.10 National Electrical Code, Section 725.54 12 Section 6
21、 INSTALLATION OF SWITCHBOARD INTERIOR 13 6.1 Instructions if Switchboard Interior Was Not Factory-Mounted . 13 6.2 Unpacking 13 6.3 Inspection 13 6.4 Storage 13 6.5 Cleaning . 13 6.6 Manufacturers Instructions 13 6.7 Interior Installation . 13 Section 7 STEPS TO BE TAKEN BEFORE ENERGIZING 14 7.1 Acc
22、essible Electrical Connections . 14 7.2 Blocks or Other Temporary Holding Means 14 7.3 Integrity of All Bus Mounting Means 14 7.4 Enclosure . 14 7.5 Operating Mechanisms 14 7.6 Electrical Insulation Resistance Test . 14 7.7 Electrical Relays, Meters, and Instrumentation . 14 7.8 Electrically Operate
23、d Switches, Circuit Breakers, and Other Mechanisms . 14 7.9 Ground Fault Protection System 15 7.10 Adjustable Time Current Trip Device Settings . 15 7.11 Field Wiring 15 7.12 Grounding Connections . 15 7.13 Foreign Material . 15 7.14 Covers and Doors 15 Section 8 ENERGIZING EQUIPMENT 16 8.1 Qualifie
24、d Personnel Present 16 8.2 No Load on Switchboard . 16 8.3 Energized in Sequence 16 8.4 After All Main, Feeder, and Branch Circuit Devices Have Been Closed 16 Section 9 MAINTENANCE 17 9.1 Maintenance Program for Switchboards . 17 9.2 Field Test . 17 9.3 Switchboard Inspection Once Each Year 17 9.4 A
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