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This is a preview of "NECA 402-2014". Click here to purchase the full version from the ANSI store.NECA 402-2014Standard forInstalling and MaintainingMotor Control CentersAN AM ERIC AN N ATI O NA L S TA NDA RDPublished byNational Electrical Contractors Association
This is a preview of "NECA 402-2014". Click here to purchase the full version from the ANSI store.NECA 402-2014Standard forInstalling and MaintainingMotor Control CentersAn AmericanNational Standard Published byNational ElectricalContractors Association
This is a preview of "NECA 402-2014". Click here to purchase the full version from the ANSI store.Revision HistoryNECA 402-2000 originally publishedNECA 402-2007 revisedNECA 402-2014 revised12/200007/200709/2014NOTICE OF COPYRIGHTThis document is copyrighted by NECAReproduction of these documents either in hard copy or soft (including posting on the web) is prohibitedwithout copyright permission. For copyright permission to reproduce portions of this document, pleasecontact NECA Standards & Safety at (301) 215-4549, or send a fax to (301) 215-4500.ORNational Electrical Contractors Association3 Bethesda Metro Center, Suite 1100Bethesda, MD 20814(301) 657-3110
This is a preview of "NECA 402-2014". Click here to purchase the full version from the ANSI store.1. ScopeTableof ContentsForeword.v1.1.11.2Scope. 1Products and Applications Included.1Regulatory and Other Requirements.12.Definitions. 23.3.13.23.3Safety Procedures. 3General .3Safe Work Practices .3De-energizing Electrical Equipment .44.4.14.24.3Delivery, Handling, and Storage. 5Delivery .5Handling .5Storage .65.5.15.2Site Preparation. 8Location .8Foundation Preparation .86.6.16.26.36.46.56.66.76.86.96.10Installation. 10General .10Installing Vertical Sections .10Joining and Anchoring Motor Control Center Sections .11Electrical Interconnections Between Vertical Sections .11Grounding and Bonding .12Installing Conduits .14Installing Cables and Conductors .14Terminating Conductors .14Busway Connections .15Installing Motor Control Units .157.7.17.27.37.47.5Closing Equipment. 16Clean-up .16Inspections and Adjustments .16Insulation Resistance Testing .16Circuit Breakers and Fusible Switches .17Ground-Fault Protection Systems .18iiin
This is a preview of "NECA 402-2014". Click here to purchase the full version from the ANSI store.NECA 402Standard for Installing and Maintaining Motor Control Centers7.6Final Checks .188.8.18.28.3Energizing Equipment. 19General .19Energizing Motor Control Centers and Equipment .19Operating and Maintenance Manuals .209.9.19.29.39.49.59.6Maintenance. 21Frequency of Inspections and Maintenance .21Routine Inspections .22Cleaning .22Inspection, Maintenance, and Testing .23Electrical Testing .29Re-energizing Motor Control Centers .2910.10.110.210.3Adverse Circumstances. 30Inspection Following a Short Circuit or Ground-fault Condition .30Replacing or Reconditioning a Motor Control Center Submerged in or Soaked by Water .31Inspecting and Re-energizing a Motor Control Center Sprayed or Splashed with Clean Water .3111.Motor Control Center Insulation Resistance Chart. 33Annex A: Reference Standards. 34niv
This is a preview of "NECA 402-2014". Click here to purchase the full version from the ANSI store.(This foreword is not a part of the standard)1. ScopeForewordNational Electrical Installation Standards (NEIS )are designed to improve communication amongspecifiers, purchasers, and suppliers of electricalconstruction services. They define a minimumbaseline of quality and workmanship for installingelectrical products and systems. NEIS are intendedto be referenced in contract documents for electricalconstruction projects. The following language isrecommended:Motor control centers shall be installed andmaintained in accordance with NECA 402,Standard for Installing and Maintaining MotorControl Centers (ANSI).Use of NEIS is voluntary, and the National ElectricalContractors Association assumes no obligationor liability to users of this publication. Existenceof a standard shall not preclude any member ornonmember of NECA from specifying or usingalternate construction methods permitted byapplicable regulations.This publication is intended to comply with theNational Electrical Code (NEC). Because they arequality standards, NEIS may in some instancesgo beyond the minimum safety requirements ofthe NEC. It is the responsibility of users of thispublication to comply with state and local electricalcodes when installing electrical products and systems.Suggestions for revisions and improvements to thisstandard are welcome. They should be addressed to:NECA Standards & Safety3 Bethesda Metro Center, Suite 1100Bethesda, MD 20814(301) 657-3110 telephone(301) 215-4500 faxwww.neca-neis.orgneis@necanet.orgTo purchase NEIS, contact the NECA Order Desk at(301) 215-4504 tel, (301) 215-4500 fax, or orderdesk@necanet.org. NEIS can also be purchased in PDFformat from www.neca-neis.org/standards.Copyright 2014, National Electrical ContractorsAssociation. All rights reserved. Unauthorizedreproduction prohibited.National Electrical Installation Standards, NEIS, andthe NEIS logo are trademarks of the National ElectricalContractors Association. National Electrical Code andNEC are registered trademarks of the National FireProtection Association, Quincy, MA.Cover illustration courtesy of Square D by Schneider Electric.vn
This is a preview of "NECA 402-2014". Click here to purchase the full version from the ANSI store.NECA 402Standard for Installing and Maintaining Motor Control Centers This page intentionally left blank nvi
This is a preview of "NECA 402-2014". Click here to purchase the full version from the ANSI store.1. Scope1.1Products and Applications IncludedThis standard describes the installation andmaintenance procedures for low-voltage motorcontrol centers (MCCs) rated 600 VAC or less with ahorizontal bus rating of 2,500 amperes or less.MCCs may be assembled with factory-installed drytype transformers and panelboards. The testingand maintenance of such dry-type transformers isaddressed in NECA 409, Standard for Installing andMaintaining Dry-Type Transformers (ANSI). Thetesting and maintenance of such panelboards isaddressed in NECA 407, Standard for Installing andMaintaining Panelboards (ANSI).1.2Regulatory and Other Requirementsa) All information in this publication is intendedto conform to the National Electrical Code (ANSI/NFPA Standard 70). Installers should always followthe NEC , applicable state and local codes, andmanufacturer’s instructions when installing electricalequipment and systems.b) Only qualified persons as defined in the NECfamiliar with the construction and installation ofelectrical power distribution and control systemsand equipment should perform the technicalwork described in this publication. Administrativefunctions and other tasks can be performed underthe supervision of a qualified person. All workshould be performed in accordance with NFPA70E, Standard for Electrical Safety in the Workplace(ANSI).c) General requirements for installing electricalproducts and systems are described in NECA 1,Standard for Good Workmanship in ElectricalConstruction (ANSI). Other National ElectricalInstallation Standards provide additional guidancefor installing particular types of electrical productsand systems. A complete list of NEIS is provided inAnnex A.1n
Motor control centers shall be installed and maintained in accordance with NECA 402, Standard for Installing and Maintaining Motor Control Centers (ANSI). Use of NEIS is voluntary, and the National Electrical Contractors Association assumes no obligation or liability to users of this publication. Existence
