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NEMA Standards Publication PB 1.1-2007General InstructionsforProper Installation, Operation, and MaintenanceofPanelboards Rated 600 Volts or LessPublished byNational Electrical Manufacturers Association1300 North 17th StreetRosslyn, Virginia 22209www.nema.org Copyright 2007 by the National Electrical Manufacturers Association. All rights including translation intoother languages, reserved under the Universal Copyright Convention, the Berne Convention for theProtection of Literary and Artistic Works, and the International and Pan American Copyright Conventions.
NOTICE AND DISCLAIMERThe information in this publication was considered technically sound by the consensus of personsengaged 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 personparticipating in the development of this document.The National Electrical Manufacturers Association (NEMA) standards and guideline publications, ofwhich the document contained herein is one, are developed through a voluntary consensusstandards development process. This process brings together volunteers and/or seeks out theviews of persons who have an interest in the topic covered by this publication. While NEMAadministers the process and establishes rules to promote fairness in the development ofconsensus, it does not write the document and it does not independently test, evaluate, or verifythe accuracy or completeness of any information or the soundness of any judgments contained inits standards and guideline publications.NEMA disclaims liability for any personal injury, property, or other damages of any naturewhatsoever, whether special, indirect, consequential, or compensatory, directly or indirectlyresulting from the publication, use of, application, or reliance on this document. NEMA disclaimsand makes no guaranty or warranty, expressed or implied, as to the accuracy or completeness ofany information published herein, and disclaims and makes no warranty that the information in thisdocument will fulfill any of your particular purposes or needs. NEMA does not undertake toguarantee the performance of any individual manufacturer or seller’s products or services by virtueof this standard or guide.In publishing and making this document available, NEMA is not undertaking to render professionalor other services for or on behalf of any person or entity, nor is NEMA undertaking to perform anyduty owed by any person or entity to someone else. Anyone using this document should rely onhis or her own independent judgment or, as appropriate, seek the advice of a competentprofessional 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 fromother sources, which the user may wish to consult for additional views or information not coveredby this publication.NEMA has no power, nor does it undertake to police or enforce compliance with the contents ofthis document. NEMA does not certify, test, or inspect products, designs, or installations for safetyor health purposes. Any certification or other statement of compliance with any health or safety–related information in this document shall not be attributable to NEMA and is solely theresponsibility of the certifier or maker of the statement.
PB 1.1-2007Page iCONTENTSPageForeword .ivSection 1 SCOPE . 1Section 2 REFERENCES . 2Section 33.13.23.3GENERAL . 3Successful Operation of Panelboards . 3Qualified Personnel . 3Definition of Qualified Personnel . 33.3.1 Requirements . 33.3.2 Established Safety Practices. 33.3.3 Protective Equipment . 33.3.4 First Aid . 33.4Suitable Ratings . 3Section 4 INSTALLATION OF PANELBOARD CABINETS (BOXES) . 44.1Installation Instructions . 44.2Location in Building . 44.3Flammable Material . 44.4Unusual Service Conditions . 44.5Indoor Damp Locations . 44.6Wet Locations. 44.7Clearance from Ceiling . 44.8Space around the Cabinet. 44.9Mounting of Cabinet . 44.10Flush Mounting in Wall . 54.11Unused Openings in Cabinet . 54.12Grounding of Panelboard Cabinets . 5Section 5 INSTALLATION OF CONDUIT AND CONDUCTORS. 65.1Conduits Installation . 65.2Knockouts Removal. 65.2.1 First Step—Remove Center Knockout. 65.2.2 Next Step—Remove Rings . 65.3National Electrical Code, Article 300 . 65.4Conductor Length . 65.5Exercise Care . 65.6National Electrical Code, Section 725.54 . 7Section 6 INSTALLATION OF PANELBOARD. 116.1Proper Storage . 116.2Unpacking. 116.3Inspection . 116.4Care . 116.4.1 Cleaning . 116.5Manufacturer's Instructions . 116.6Installation. 116.6.1 Alignment Devices . 116.6.2 Panelboard . 116.6.3 Flange of Deadfront Shield . 116.7Line And Branch Conductors . 126.7.1 Conductors . 126.8Panelboard Grounding . 126.8.1 Equipment Grounding Conductors. 126.9Proper Type Or Class And Rating. 12 Copyright 2007 by the National Electrical Manufacturers Association.
PB 1.1-2007Page ii6.106.11Section 77.17.27.37.47.57.67.77.8Section 88.18.28.38.48.5Section 99.19.29.39.4Section .12Debris . 12Steps In Section 7 . 12STEPS TO BE TAKEN BEFORE ENERGIZING. 13Accessible Electrical Connections. 13Blocks and Packing Materials . 13Switches, Circuit Breakers, and Other Operating Mechanisms . 13Short Circuits and Ground Faults . 13Ground Fault Protection System . 13Adjustable Time Current Trip Device Settings . 13Grounding Connections. 13Foreign Material. 14INSTALLATION OF CABINET FRONT. 15Cabinet Front or Trim Package . 15Unpacking. 15Covers and Doors. 15Touch-Up . 15Front Alignment . 15ENERGIZING EQUIPMENT. 16Qualified Personnel . 16Load on the Panelboard . 16Energized in Sequence . 16Loads Such as Lighting Circuits, Contactors, Heaters, and Motors . 16MAINTENANCE . 17Maintenance Program . 17Panelboard Which Has Been Carrying Its Regular Load for at Least 3 Hours . 17Inspect Panelboard Once Each Year . 17Accumulation of Dust and Dirt. 1710.4.1 Visible Electrical Joints and Terminals. 1710.4.2 Conductors and Connections.
Title: _NEMA PUBLICATION PB 1.1 199X6 Author: NEMA Created Date: 3/25/2008 4:07:39 PMFile Size: 229KBPage Count: 28
