1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/NEMA PB 1.1-2013General Instructions for Proper Handling, Installation, Operation, and Maintenance of Panelboards Rated 600 Volts or lessANSI/NEMA PB 1.1-2013 General Instructions for Proper Installation, Operation, and Main
2、tenance of Panelboards 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 11, 2013 2014 National Electrical Manufacturers Association. All rights, including translation into oth
3、er 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. NOTICE AND DISCLAIMER (ANSI Accredited Standards Committee) The information in this publication was c
4、onsidered 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 unanimous agreement among every person participating in the development of this document. ANSI standards, of
5、 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 persons who have an interest in the topic covered by this publication. As Secretary of the ANSI Accredited Sta
6、ndards 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 publisher of this document, NEMA does not write the document and it does not independently test, evaluate or verify
7、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, property or other damages of any nature whatsoever, whether special, indirect, consequential or compensatory, dir
8、ectly 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 or completeness of any information published herein, and disclaims and makes no warranty that the informatio
9、n 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 by virtue of this standard or guide. In publishing and making this document available, NEMA is not undertakin
10、g 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 this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a compet
11、ent 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 other sources, which the user may wish to consult for additional views or information not covered by this publica
12、tion. 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 for safety or health purposes. Any certification or other statement of compliance with any health or safetyrela
13、ted information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. PB 1.1-2013 Page i 2014 National Electrical Manufacturers Association TABLE OF CONTENTS Page Foreword iv Section 1 SCOPE 1 Section 2 REFERENCES 2 Section 3
14、GENERAL . 3 3.1 SUCCESSFUL OPERATION OF PANELBOARDS 3 3.2 QUALIFIED PERSONNEL . 3 3.3 DEFINITION OF QUALIFIED PERSONNEL . 3 3.3.1 Requirements 3 3.3.2 Established Safety Practices . 3 3.3.3 Protective Equipment . 3 3.3.4 First Aid 3 3.4 SUITABLE RATINGS 4 Section 4 INSTALLATION OF PANELBOARD CABINET
15、S (BOXES) . 5 4.1 Installation INSTRUCTIONS 5 4.2 Location in Building 5 4.3 Flammable Material . 5 4.4 Unusual Service Conditions . 5 4.5 Indoor Damp Locations 5 4.6 Wet Locations 5 4.7 Clearance from Ceiling 5 4.8 Space around the Cabinet . 5 4.9 Mounting of Cabinet . 5 4.10 Flush Mounting in Wall
16、 6 4.11 Unused Openings in Cabinet . 6 4.12 Grounding of Panelboard Cabinets . 6 Section 5 INSTALLATION OF CONDUIT AND CONDUCTORS . 7 5.1 Conduits Installation 7 5.2 Knockouts Removal . 7 5.2.1 First StepRemove Center Knockout 7 5.2.2 Next StepRemove Rings 7 5.3 NATIONAL ELECTRICAL CODE, ARTICLE 300
17、 . 7 5.4 CONDUCTOR LENGTH 7 5.5 EXERCISE CARE 7 5.6 NATIONAL ELECTRICAL CODE, SECTION 725.136 . 8 Section 6 INSTALLATION OF PANELBOARD 12 6.1 PROPER STORAGE . 12 6.2 UNPACKING . 12 6.3 INSPECTION . 12 6.4 CARE . 12 6.4.1 Cleaning . 12 6.5 MANUFACTURERS INSTRUCTIONS . 12 6.6 INSTALLATION . 12 6.6.1 A
18、lignment Devices . 12 6.6.2 Panelboard 12 6.6.3 Flange of Deadfront Shield 12 6.7 LINE AND BRANCH CONDUCTORS . 13 6.7.1 Conductors 13 6.8 PANELBOARD GROUNDING AND BONDING 13 6.8.1 Equipment Grounding Conductors 13 6.9 PROPER TYPE OR CLASS AND RATING . 13 PB 1.1-2013 Page ii 2014 National Electrical
19、Manufacturers Association 6.10 DEBRIS . 13 6.11 STEPS IN SECTION 7 13 Section 7 STEPS TO BE TAKEN BEFORE ENERGIZING 14 7.1 ACCESSIBLE ELECTRICAL CONNECTIONS . 14 7.2 BLOCKS AND PACKING MATERIALS . 14 7.3 SWITCHES, CIRCUIT BREAKERS, AND OTHER OPERATING MECHANISMS . 14 7.4 SHORT CIRCUITS AND GROUND FA
20、ULTS 14 7.5 GROUND FAULT PROTECTION SYSTEM 14 7.6 ADJUSTABLE TIME CURRENT TRIP DEVICE SETTINGS 14 7.7 GROUNDING CONNECTIONS . 14 7.8 FOREIGN MATERIAL . 15 Section 8 INSTALLATION OF CABINET FRONT 16 8.1 CABINET FRONT OR TRIM PACKAGE . 16 8.2 UNPACKING . 16 8.3 COVERS AND DOORS . 16 8.4 TOUCH-UP 16 8.
21、5 FRONT ALIGNMENT 16 Section 9 ENERGIZING EQUIPMENT 17 9.1 QUALIFIED PERSONNEL . 17 9.2 LOAD ON THE PANELBOARD . 17 9.3 ENERGIZED IN SEQUENCE 17 9.4 LOADS SUCH AS LIGHTING CIRCUITS, CONTACTORS, HEATERS, AND MOTORS 17 Section 10 MAINTENANCE 18 10.1 MAINTENANCE PROGRAM . 18 10.2 PANELBOARD WHICH HAS B
22、EEN CARRYING ITS REGULAR LOAD FOR AT LEAST 3 HOURS . 18 10.3 INSPECT PANELBOARD ONCE EACH YEAR 18 10.4 ACCUMULATION OF DUST AND DIRT . 18 10.4.1 Visible Electrical Joints and Terminals 18 10.4.2 Conductors and Connections 18 10.4.3 Fuse Clip Contact Pressure and Contact Means 19 10.4.4 Plug Fuses .
23、19 10.4.5 Conditions Which Caused Overheating . 19 10.5 PROPER AMPERE, VOLTAGE, AND INTERRUPTING RATINGS 19 10.5.1 Mechanisms Free and in Proper Working Order . 19 10.6 OPERATION OF ALL MECHANICAL COMPONENTS . 19 10.6.1 Switch Operating Mechanisms 19 10.6.2 Integrity of Electrical and Mechanical Int
24、erlocks 19 10.6.3 Missing or Broken Parts. 19 10.6.4 Manufacturers Instructions . 19 10.6.5 Accessible Copper Electrical Contacts, Blades, and Jaws 20 10.7 DAMAGED INSULATING MATERIAL AND ASSEMBLIES . 20 10.8 MOISTURE OR SIGNS OF PREVIOUS WETNESS OR DRIPPING 20 10.8.1 Conduits Which Have Dripped Con
25、densate 20 10.8.2 Cracks or Openings . 20 10.8.3 Insulating Material Which is Damp or Wet 20 10.8.4 Component Devices Which Show Evidence of Moisture Damage 20 10.9 BEFORE CLEANUP AND CORRECTIVE ACTION IS ATTEMPTED . 20 10.10 SEVERE ELECTRICAL SHORT CIRCUIT 21 10.11 GROUND FAULT PROTECTION SYSTEM 21
26、 10.12 INSULATION RESISTANCE . 21 10.12.1 Severe Short Circuit . 21 10.12.2 Parts Replaced 21 PB 1.1-2013 Page iii 2014 National Electrical Manufacturers Association 10.12.3 Panelboard Exposed to High Humidity 21 Section 11 PERMISSIBLE LOADING OF PANELBOARDS 22 11.1 NATIONAL ELECTRICAL CODE . 22 11.
27、2 HARMONICS IN ELECTRICAL SYSTEM . 22 Figures 51 Knockout RemovalStep 1. 9 52 Knockout RemovalStep 2. 10 53 Knockout RemovalStep 3. 11 PB 1.1-2013 Page iv 2014 National Electrical Manufacturers Association Foreword This publication is a guide of practical information containing instructions for the
28、proper installation, operation, and maintenance of panelboards rated 600 volts or less. These instructions do not purport to cover all details or variations in equipment, nor to provide for every possible contingency regarding installation, operation, or maintenance. It is recommended that work desc
29、ribed in this set of instructions be performed only by qualified personnel familiar with the construction and operation of panelboards and that such work be performed only after reading this complete set of instructions. For specific information not covered by these instructions, you are urged to co
30、ntact the manufacturer of the panelboard directly. In the preparation of this standards publication input of users and other interested parties has been sought and evaluated. Inquiries, comments, and proposed or recommended revisions should be submitted to the concerned NEMA product section by conta
31、cting the following: These recommendations will be reviewed periodically and updated as necessary. Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 Publication PB 1.1- 2013 revises and supersedes PB 1.1-2007
32、. This standards publication was developed by the Panelboard and Distribution Board Product Group of the LVDE Section. Product Group approval of the standard does not necessarily imply that all Product Group members voted for its approval or participated in its development. At the time it was approv
33、ed, the Product Group was composed of the following members: Eaton Corporation.Pittsburgh, PA GE Industrial SolutionsPlainville, CT Hubbell, Inc.Orange, CT Milbank Manufacturing CompanyKansas City, MO Penn Panel allow a space of 3 feet between the ceiling and cabinet unless an adequate fireproof shi
34、eld is provided. 4.8 SPACE AROUND THE CABINET When selecting a location, provide sufficient access and working space around the cabinet (see Section 110.26 of the National Electrical Code). The width of the working space in front of the panelboard should be at least 30 inches, or the width of the ca
35、binet, whichever is greater, and this space should not be used as storage. The working space should have adequate lighting and a minimum head room of 6 feet 6 inches. 4.9 MOUNTING OF CABINET The cabinet should be reliably secured to the mounting surface. Do not depend on wooden plugs driven into hol
36、es in masonry, concrete, plaster, or similar materials. (See Section 110.13 of the National Electrical Code.) PB 1.1-2013 Page 6 2014 National Electrical Manufacturers Association 4.10 FLUSH MOUNTING IN WALL In walls of concrete, tile, or other noncombustible material, install the cabinet so that it
37、s front edge will not set back more than 1/4 inch from the finished surface. In walls of wood or other combustible material, cabinets should be flush with or project beyond the finished surface. (See Section 312.3 of the National Electrical Code.) 4.11 UNUSED OPENINGS IN CABINET Effectively close un
38、used openings in the cabinet to provide protection which is substantially equivalent to that afforded by the wall of the cabinet. 4.12 GROUNDING OF PANELBOARD CABINETS Ground the cabinet as specified in Article 250 of the National Electrical Code. When the cabinet contains service equipment, it is n
39、ecessary to bond the cabinet to the grounded (neutral) service conductor. PB 1.1-2013 Page 7 2014 National Electrical Manufacturers Association Section 5 INSTALLATION OF CONDUIT AND CONDUCTORS 5.1 CONDUITS INSTALLATION Conduits should be installed so as to prevent moisture or water from entering and
40、 accumulating within the enclosure. Provision should be made to protect conductors from abrasion in accordance with Article 312 of the National Electrical Code. 5.2 KNOCKOUTS REMOVAL Knockouts should be removed as follows: IMPORTANTRemove knockouts, ONE AT A TIME, alternating INWARD and OUTWARD. 5.2
41、.1 First StepRemove Center Knockout Remove center knockout INWARD. 5.2.1.1 Screwdriver Blade Place screwdriver blade against point farthest from tie and strike INWARD (Figure 1). Bend back and forth to break tie. 5.2.2 Next StepRemove Rings Remove rings ONE AT A TIME without straining remaining ring
42、s. 5.2.2.1 Pry First Ring Pry first ring OUTWARD with screwdriver midway between ties, using pliers flat against box under screwdriver (Figure 2). Bend ring sections OUTWARD with pliers, then back and forth to break ties (Figure 5-3). 5.2.2.2 Second Ring Remove second ring INWARD by striking screwdr
43、iver (with blade against point midway between ties) then breaking ring sections inward and back and forth to break ties. 5.3 NATIONAL ELECTRICAL CODE, ARTICLE 300 Refer to the National Electrical Code, Article 300 for proper wiring methods. See 6.7 for making proper connections. 5.4 CONDUCTOR LENGTH
44、 Keep conductor length to a minimum within the wiring gutter. Excessive conductor length will result in additional heating and may result in overheating. However, conductors should be long enough to reach the terminal location in a manner that avoids strain on the terminal. 5.5 EXERCISE CARE Exercis
45、e care to maintain the largest practical bending radius of conductors; otherwise the insulation may be damaged and terminal connections may become loosened. Deflection of conductors shall comply with NEC Section 312.6. PB 1.1-2013 Page 8 2014 National Electrical Manufacturers Association 5.6 NATIONA
46、L ELECTRICAL CODE, SECTION 725.136 Refer to the National Electrical Code, Section 725.136 for the separation requirements for conductors of Class 2 and Class 3 remote-control, signaling and power-limited circuits. PB 1.1-2013 Page 9 2014 National Electrical Manufacturers Association Figure 51 KNOCKO
47、UT REMOVALSTEP 1 PB 1.1-2013 Page 10 2014 National Electrical Manufacturers Association Figure 52 KNOCKOUT REMOVALSTEP 2 PB 1.1-2013 Page 11 2014 National Electrical Manufacturers Association Figure 53 KNOCKOUT REMOVALSTEP 3 PB 1.1-2013 Page 12 2014 National Electrical Manufacturers Association Sect
48、ion 6 INSTALLATION OF PANELBOARD 6.1 PROPER STORAGE Store the panelboard in a clean, dry place located so that mechanical damage from work personnel in the area is not likely to happen. 6.2 UNPACKING Care should be exercised in unpacking the panelboard to prevent damage and loss of instruction mater
49、ials and loose parts. 6.3 INSPECTION Check for shipping damage and check to make sure that the panelboard is the correct one for installation in the cabinet. 6.4 CARE Care should be taken to protect the panelboard internal parts from contamination during the installation process. 6.4.1 Cleaning Clean the cabinet of all foreign materials. If parts at connection points are spattered with cement, plaster, paint, or other foreign material, remove the foreign materials with great care to avoid damage to the plating. CAUTIONHYDROCARBON
