1、AN AMERICAN NATIONAL STANDARDNECA 408-2015Standard forInstalling and MaintainingBuswaysPublished byNational Electrical Contractors AssociationStandard forInstalling and Maintaining BuswaysNECA 408-2015An AmericanNational StandardPublished byNational Electrical Contractors AssociationNOTICE OF COPYRI
2、GHTThis document is copyrighted by NECAReproduction of these documents either in hard copy or soft (including posting on the web) is prohibited without copyright permission. For copyright permission to reproduce portions of this document, please contact NECA Standards & Safety at (301) 215-4549, or
3、send a fax to (301) 215-4500.ORNational Electrical Contractors Association 3 Bethesda Metro Center, Suite 1100 Bethesda, Maryland 20814 (301) 657-3110Revision HistoryNECA 408-2002 originally published 04/2002NECA 408-2009 revised 12/2009NECA 408-2015 revised 02/2015iii n1. ScopeForeword v1. Scope .
4、11.1 Applications and Products Included .11.2 Applications and Products Excluded 11.3 Regulatory and Other Requirements 11.4 Mandatory Requirements, Permissive Requirements, Quality and Performance Recommendations, Explanatory Material, and Informative Annexes.12. Definitions . 33. Safety Procedures
5、 53.1 General 53.2 Safe Work Practices 53.3 Personal Protective Equipment (PPE) . 63.4 De-Energizing Electrical Equipment 64. Delivery, Handling, and Storage 74.1 Delivery and Inspection .74.2 Handling .74.3 Storage .75. Installation Procedures 85.1 Busway System Layout and Coordination 85.2 General
6、 Installation Procedures 95.3 Busway Hangers and Supports 95.4 Expansion Joints .105.5 Busway Penetrations .105.6 Busway Joint Connections .115.7 Vertically-Mounted Busways 115.8 Outdoor Busways .115.9 Busways with Plug-In Devices .115.10 Grounding 126. Testing and Commissioning Busways . 136.1 Clea
7、ning 136.2 General 136.3 Insulation Resistance Testing Prior to Energizing Busway 136.4 Energizing Busway .13Table of Contentsn ivNECA 408 Standard for Installing and Maintaining Busways6.5 Infrared Scan 146.6 Correcting Problems 147. Closeout . 157.1 Spare Parts and Special Tools 157.2 Installation
8、, Operation, and Maintenance Manuals and Test Data.157.3 Training .158. Inspections and Maintenance 168.1 Recommended Procedures During First Year of Operation 168.2 Frequency of Inspections and Maintenance .168.3 Inspecting Energized Busway 168.4 Inspecting De-Energized Busway 178.5 Cleaning De-Ene
9、rgized Busway.178.6 Testing De-Energized Busway 178.7 Inspecting, Testing, and Servicing Devices with Busway De-Energized .178.8 Final Infrared Scan .189. Inspection and Re-Energization After Adverse Operating Conditions 199.1 Inspection Following a Short-Circuit or Ground-Fault 199.2 Busway Soaked
10、By or Submerged Under Water .199.3 Inspecting and Re-energizing Busway Sprayed or Splashed with Clean Water1910. Electrical Tests 2010.1 Insulation Resistance Test .2010.2 Infrared Scan 2010.3 Record Keeping .20Annex A: Reference Standards 22v n1. ScopeNational Electrical Installation Standardsare d
11、esigned to improve communication among specifiers, purchasers, and suppliers of electrical construction services. They define a minimum baseline of quality and workmanship for installing electrical products and systems. NEISare intended to be referenced in contract documents for electrical construct
12、ion projects. The following language is recommended:Busways should be installed and maintained in accordance with NECA 408-2015, Standard for Installing and Maintaining Busways (ANSI).Use of NEIS is voluntary, and the National Electrical Contractors Association (NECA) assumes no obligation or liabil
13、ity to users of this publication. Existence of a standard shall not preclude any member or non-member of NECA from specifying or using alternate construction methods permitted by applicable regulations.This publication is intended to comply with the edition of the National Electrical Code (NEC). Bec
14、ause they are quality standards, NEIS may in some instances go beyond the minimum safety requirements of the NEC. It is the responsibility of users of this publication to comply with state and local electrical codes and Federal and state OSHA safety regulations as well as follow manufacturers instal
15、lation instructions when installing electrical products and systems.Suggestions for revisions and improvements to this standard are welcome. They should be addressed to:NECA Standards & Safety 3 Bethesda Metro Center, Suite 1100 Bethesda, MD 20814 (301) 657-3110 (301) 215-4500 fax www.neca-neis.org
16、neisnecanet.orgTo purchase National Electrical Installation Standards, contact the NECA Order Desk at (301) 215-4504 tel, (301) 215-4500 fax or orderdesknecanet.org. NEIS can also be purchased in .pdf download format at www.neca-neis.org/standards.Copyright 2015, National Electrical Contractors Asso
17、ciation. All rights reserved. Unauthorized reproduction prohibited. National Electrical Installation Standards, NEIS, and the NEIS logo are registered trademarks of the National Electrical Contractors Association. National Electrical Code and NEC are registered trademarks of the National Fire Protec
18、tion Association, Quincy, Massachusetts.Foreword(This foreword is not a part of the standard)1 n1. Scope1.1 Applications and Products IncludedThis standard describes the installation and maintenance procedures for feeder and plug-in busways and accessories rated 600 Volts AC or less, and 100 Amperes
19、 or more, installed above ground. It also covers periodic routine maintenance procedures for busway, and special procedures used after adverse operating conditions such as a short-circuit, ground-fault, or immersion in water.1.2 Applications and Products ExcludedThis publication does not cover light
20、ing busway, trolley busway, cable-bus, or medium-voltage or metal-enclosed busway.1.3 Regulatory and Other RequirementsAll information in this publication is intended to conform to the NEC (ANSI/NFPA 70). Installers shall follow the NEC, applicable state and local codes, manufacturers instructions,
21、and contract documents when installing stored energy systems.Only qualified persons as defined in the NEC familiar with the construction and installation of busways shall perform the technical work described in this publication. Administrative functions such as receiving, handling and storing requir
22、ed in Section 4, and other tasks may be performed under the supervision of a qualified person. All work shall be performed in accordance with NFPA 70E, Standard for Electrical Safety in the Workplace. General requirements for installing electrical products and systems are described in NECA 1, Standa
23、rd for Good Workmanship in Electrical Construction (ANSI). Other NEIS provide additional guidance for installing particular types of electrical products and systems. A complete list of NEIS is provided in Annex A.1.4 Mandatory Requirements, Permissive Requirements, Quality and Performance Recommenda
24、tions, Explanatory Material, and Informative AnnexesMandatory Requirements. Mandatory requirements in manufacturers instructions, or of Codes or other mandatory Standards that may or not be adopted into law, are those that identify actions that are specifically required or prohibited and are charact
25、erized by the use of the terms must or must not, shall or shall not, or by the use of positive phrasing of mandatory requirements. Examples of mandatory requirements may equally take the form of, “equipment must be protected . . .,” “equipment shall be protected . . .,” or “protect equipment . . .,”
26、 with the latter interpreted (understood) as “(it is necessary to) protect equipment . . .” Permissive Requirements. Permissive requirements of manufacturers instructions, or of Codes or other mandatory Standards that may or not be adopted into law, are those that identify actions that that are allo
27、wed but not required, are normally used to describe options or alternative means and methods, and are characterized in this Standard by the use of the terms may or may not, or are permitted or are not required. Quality and Performance Recommendations. Quality and performance recommendations identity
28、 actions that are recommended or not recommended to improve the overall quality or performance of the installation and are characterized by the use of the term should or should not. n 2NECA 408 Standard for Installing and Maintaining BuswaysExplanatory Material. Explanatory material, such as referen
29、ces to other Codes, Standards, or documents, references to related sections of this Standard, information related to another Code, Standard, or document, and supplemental application and design information and data, is included throughout this Standard to expand the understanding of mandatory requir
30、ements, permissive requirements, and quality and performance recommendations. Such explanatory material is included for information only, and is Identified by the use of the term “Note,” or by the use of italicized text. Informative Annexes. Non-mandatory information, other reference standards or do
31、cuments relative to the application and use of materials, equipment, and systems covered by this Standard are provided in informative annexes. Informative annexes are not part of the enforceable requirements of this Standard, but are included for information purposes only. 3 n1. ScopeAccessories Non
32、-current-carrying busway system components that are used to protect the busway, to enclose the busway, or to mount the busway to the building structure. Busway accessories include such items as covers, end caps, fasteners, flanges, and weather shields.Adapter A busway system fitting that permits the
33、 joining together of lengths and fittings of different shapes or designs.Busway A raceway consisting of a grounded metal enclosure containing factory-mounted, bare or insulated conductors, which are usually copper or aluminum bars, rods, or tubes. A busway system consists of straight lengths, access
34、ories, adapters, connectors, devices, and fittings required to form a complete, continuous electrical distribution system.Bus duct Another term sometimes used for busway. Busway is the term used in the National Electrical Code and throughout this publication.*Cablebus An approved assembly of insulat
35、ed conductors with accessories, fittings, and conductor terminations in a completely enclosed, ventilated protective metal housing. Cablebus is typically assembled in the field from components furnished or specified by the manufacturer in accordance with instructions for the specific job.Cable Tap B
36、ox A busway device that provides for busway tap connections, such as a transformer tap box.Connector A metallic coupling device of suitable electric conductance and mechanical strength used to splice together sections of busway and busway fittings.Device A busway system component connected to a busw
37、ay for the purpose of tapping the bus bars. Busway devices consist of such items as cable tap boxes and plug-in units.End Cap A busway accessory that closes the end of a busway run.Expansion Fitting A busway fitting that provides for the expansion, contraction, and movement of the busway or building
38、.Feeder Busway Busway having no plug-in openings and intended primarily to supply a single piece of electrical equipment, such as a distribution switchboard, motor control center, or large individual load.Fitting A busway system component other than a straight length, such as an expansion fitting, e
39、lbow, offset, cross, tee, switchboard stub, tap box, transformer throat connection, or similar component.Flange A busway accessory that mounts to the outside of the busway and covers an opening penetrated by the busway, such as a floor, walls, or roof, or an equipment enclosure such as a switchboard
40、 or transformer.*Lighting Busway Busway designed to provide electric power and mechanical support for luminaires or other small loads.2. Definitions(NOTE: Definitions marked with an asterisk * are shown for information only. These types of busways are not within the scope of this publication.)n 4NEC
41、A 408 Standard for Installing and Maintaining Busways*Metal Enclosed Busway Busway rated greater than 600 Volts and less than 38,000 Volts.Plug-in Busway Busway having plug-in openings on one or both sides at spaced intervals and offering the means for electrical connection of busway devices to the
42、busbars intended primarily for distributing power to various loads along the route of the busway.Plug-in Unit A busway device that is factory designed and assembled to provide taps to plug-in busway. Plug-in units consist of items such as fusible switches, circuit breakers, static voltage protectors
43、, ground indicating detectors, combination motor starters, lighting contactors, transformers, and capacitor plugs. Plug-in units may be equipped with additional accessories including control power transformers, relays, indicating lights, and terminal blocks for remote control and indication.Switchbo
44、ard Stub or Mounting Flange A busway fitting that provides means for mechanically and electrically connecting the busway to other electrical equipment such as switchboards or switchgear.Transformer Tap Box A busway fitting that extends the bus bars beyond its housing for the purpose of making final
45、busway-to-transformer connections using cables.Transformer Throat Connection or Mounting Flange A busway fitting that provides means for mechanically and electrically connecting busway to a transformer. A transformer mounting flange extends the bus bars beyond its housing for the purpose of making f
46、inal busway-to-transformer connections using cables, solid bussing, or flexible connectors.*Trolley Busway Busway having an insulated housing that contains exposed steel or copper bars, rods, or tubes that permits tap access at any point along the continuous length of the busway by the use of plug-i
47、n tap devices. Trolley plug-in devices are self supported and suspended from the trolley busway. Trolley busway accommodates mobile power taps for electric hoists, cranes, and portable tools.5 n1. ScopeBefore performing cleaning, inspections, testing, maintenance, or repairs, electrically isolate co
48、nductors and equipment in accordance with established written procedures. All work and actions must conform to the requirements of NFPA 70E, Standard for Electrical Safety in the Workplace.The process of de-energizing is considered “live” work and can result in an arc flash due to equipment failure.
49、 When de-energizing conductors and equipment, follow safety procedures for working on or near live circuits. Failure to observe these precautions may result in severe personal injury or death.3.1 GeneralFor electrical equipment to work properly, it must be handled carefully and installed, operated, and maintained correctly. Neglecting fundamental installation and maintenance requirements may lead to personal injury or death, and damage to conductors, electrical equipment, and other property.Consider all circuits and ungrounded
