1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA BU 1.1-2010General Instructions for Handling, Installation, Operation, and Maintenance of Busway Rated 600 Volts or LessNEMA Standards Publication BU 1.1-2010 General Instructions for Handling, Installation, Operation, and M
2、aintenance of Busway Rated 600 Volts or Less Published by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 www.nema.org Copyright 2010 by the National Electrical Manufacturers Association. All rights including translation into other languages,
3、 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 The information in this publication was considered technically sound by the consensus of per
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5、d guideline publications, 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 persons who have an interest in the topic covered by this publication. While NEMA
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13、ifier or maker of the statement. BU 1.1-2010 Page i CONTENTS Foreword ii Section 1 SCOPE.1 Section 2 REFERENCED STANDARDS 2 Section 3 GENERAL3 Section 4 HANDLING.4 Section 5 STORAGE5 Section 6 INSTALLATION .6 6.1 General.6 6.2 Unpacking 6 6.3 Hoisting and Handling (See Also Section 4).6 6.4 Hanging
14、or Supporting.6 6.5 Joint Assembly.7 6.6 Grounding.7 6.7 Mounting Plug-In Devices8 6.8 Protection from Liquids, Moisture, and Other Contaminants8 6.9 Summary9 Section 7 STEPS TO BE TAKEN BEFORE ENERGIZING10 Section 8 ENERGIZING EQUIPMENT11 Section 9 CARE AND MAINTENANCE 12 9.1 Outdoor Busway 12 9.2
15、Indoor Busway .12 9.3 Busway Plugs and Cubicles with Protective Devices.13 9.4 Final Test15 Section 10 PERMISSIBLE LOADING OF BUSWAYS .16 10.1 BuswaysWith or Without Overcurrent Protection16 10.2 Busway Plugs.16 Section 11 OPERATING CONDITIONS .17 Copyright 2010 by the National Electrical Manufactur
16、ers Association. BU 1.1-2010 Page ii FOREWORD This publication is a guide of practical information containing instructions for the proper handling, installation, operation, and maintenance of busway and associated fittings rated 600 volts or less. These instructions do not purport to cover all detai
17、ls or variations in equipment, nor to provide for every possible contingency regarding handling, installation, operation, or maintenance. It is recommended that work described in this set of instructions be performed only by qualified personnel familiar with the construction and operation of busway
18、and associated fittings 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 contact the manufacturer of the busway directly. These recommendations of the Busway Section of the National Elec
19、trical Manufacturers Association will be found useful by architects, electrical engineers, electrical contractors, electricians, maintenance engineers, and others. These recommendations will be reviewed periodically by the section and updated as necessary. Please address any comments or questions yo
20、u may have on the text to: Vice President, Technical Services National Electrical Manufacturers Association 1300 N. 17th Street, Suite 1752 Rosslyn, VA 22209 This Standards Publication was developed by the Busway Section. At the time it was approved, the Group/Section was composed of the following m
21、embers: Eaton Electrical, Inc.Pittsburgh, PA GE Consumer contact manufacturer before re-torquing joint bolts. CAUTION: Do not remove plating from aluminum parts in joints or terminations. Removal of plating can result in overheating. Replace damaged aluminum parts. 9.2.8 Check the insulation resista
22、nce prior to re-energizing the busway. A permanent record should be kept of resistance readings. If readings decrease appreciably with time, deterioration is taking place and must be corrected. (Contact the manufacturer.) Also, refer to Section 7.4. 9.3 BUSWAY PLUGS AND CUBICLES WITH PROTECTIVE DEVI
23、CES WARNING: HAZARDOUS VOLTAGES IN ELECTRICAL EQUIPMENT CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. UNLESS OTHERWISE SPECIFIED, INSTALLATION, INSPECTION, AND MAINTENANCE SHOULD ONLY BE PERFORMED ON BUSWAY AND EQUIPMENT TO WHICH POWER HAS BEEN TURNED OFF, DISCONNECTED, AND ELECTRICALLY ISOLATED SO THA
24、T NO ACCIDENTAL CONTACT CAN BE MADE WITH ENERGIZED PARTS. FOLLOW ALL MANUFACTURERS WARNINGS AND INSTRUCTIONS. Copyright 2010 by the National Electrical Manufacturers Association. BU 1.1-2010 Page 14 CAUTION: Hydrocarbon spray propellants and hydrocarbon based sprays or compounds will cause degradati
25、on of certain plastics and elastomers. Contact the busway manufacturer before using these products to clean, dry, or lubricate compounds during installation or maintenance. 9.3.1 Additional guidance on the care and maintenance of protective devices can be found in NEMA AB 4 for molded case circuit b
26、reakers and NEMA KS 3 for switches. 9.3.2 Turn off power to busway. 9.3.3 Examine fuse clip contact pressure and contact means. If there is any sign of overheating or looseness, follow the manufacturers maintenance instructions or replace the fuse clips. Loose fuse clips can result in overheating. 9
27、.3.4 Look for any signs of deterioration in insulating material or melting of the sealing compound. Replace such insulating parts and assemblies where the sealing compound has melted. 9.3.5 BE SURE THAT ALL CONDITIONS WHICH CAUSED THE OVERHEATING HAVE BEEN CORRECTED. 9.3.6 Check the operation of all
28、 mechanical components. 9.3.6.1 Exercise switch operating mechanisms and external operators for circuit breakers to determine that they operate freely to their full on and off positions. 9.3.6.2 Check the mechanisms of all electrical and mechanical interlocks and padlocking means. 9.3.6.3 Check for
29、missing or broken parts, proper spring tension, free movement, rusting or corrosion, dirt, and excessive wear. 9.3.6.4 Examine all readily accessible arc chutes and insulating parts for cracks or breakage and for arc spatter, sooty deposits, oil, or tracking. 9.3.6.5 Clean off arc spatter, oil, and
30、sooty deposits. Replace the device if appreciable material has burned away or if parts are charred or cracked. 9.3.7 Lubricate the operating parts of switch mechanisms, and other moving parts, according to the manufacturers instructions. Use only manufacturer approved cleaners and lubricates. CAUTIO
31、N: Hydrocarbon spray propellants and hydrocarbon based sprays or compounds will cause degradation of certain plastics and elastomers. Contact the busway manufacturer before using these products to clean, dry, or lubricate compounds during installation or maintenance. 9.3.7.1 Use clean, nonmetallic,
32、light grease or oil as instructed. 9.3.7.2 Do not oil or grease parts of molded case circuit breakers. 9.3.7.3 If no instructions are given on the devices, sliding copper contacts, operating mechanisms, and interlocks may be lubricated with clean, light grease. 9.3.7.4 Wipe off excess lubrication to
33、 avoid accumulation of foreign material. 9.3.8 Operate each switch or circuit breaker several times to ensure that all mechanisms are free and in proper working order. Ensure all interlocking mechanisms function properly. Copyright 2010 by the National Electrical Manufacturers Association. BU 1.1-20
34、10 Page 15 9.3.9 Re-tighten all wire connections according to the manufacturers instructions. 9.3.10 Check circuit breakers and fuses to ensure they have the proper ampere, voltage, and interrupting ratings. Ensure that noncurrent-limiting devices are not used as replacements for current-limiting de
35、vices. Never attempt to defeat rejection mechanisms, which are provided to prevent the installation of the incorrect class of fuse. 9.3.11 Check the insulation resistance of devices prior to their reinstallation on the busway. 9.4 FINAL TEST 9.4.1 After performing all of the above inspections and ne
36、cessary repairs, it may be desirable to perform another infrared temperature scan on all electrical connections after busway is re-energized and reaches a stabilized operating temperature. A permanent record should be kept. If readings change with time, deterioration may be taking place and must be
37、corrected. Copyright 2010 by the National Electrical Manufacturers Association. BU 1.1-2010 Page 16 Section 10 PERMISSIBLE LOADING OF BUSWAYS 10.1 BUSWAYSWITH OR WITHOUT OVERCURRENT PROTECTION 10.1.1 The total continuous load current should not exceed the current rating on the busway nameplate. For
38、outdoor busway, the radiant heat from the sun in the installation location must be considered when busway system is sized for ampacity. Consult the manufacturer for appropriate derating. 10.2 BUSWAY PLUGS 10.2.1 The total continuous load current on a busway fusible plug should not exceed 80 percent
39、of the ampere rating of the fuses. The total continuous load current on other types of plugs should not exceed 80 percent of the ampere rating of the plug unless the device is rated to carry 100 percent of its ampere rating. Cycling loads with high inrush currents may require additional consideratio
40、n when sizing plug-in units. Consult the manufacturers literature for proper sizing under these conditions. Copyright 2010 by the National Electrical Manufacturers Association. BU 1.1-2010 Page 17 Section 11 OPERATING CONDITIONS 11.1 NORMAL OPERATING CONDITIONS 11.1.1 Busways shall be suitable for o
41、peration: a. When and where the ambient temperature is within the limits -30C through +40C for busway and busway plug-in-units incorporating enclosed switches. b. When and where the ambient temperature is within the limits 0C through +40C for busway plug-in-units incorporating molded case circuit br
42、eakers or electromagnetic and manual motor controls. c. Where the altitude does not exceed 6600 feet (2000 meters). 11.1.2 Voltage Drop (General) Good practice indicates that the voltage drop in feeder circuits up to the final distribution point where the load is divided into individual branch circu
43、its should not exceed 3 percent for power, heating, or lighting loads or combination thereof. Total voltage drop for feeders and individual branch circuits up to the final utilization point should not exceed 5 percent overall. 11.2 UNUSUAL OPERATING CONDITIONS 11.2.1 When busways are installed in lo
44、cations that have a continuous ambient temperature above 40C (104F), the busways should be de-rated in accordance with the manufacturers recommendations, if furnished, or the following table: AMBIENT TEMPERATURE MULTIPLIER 40C (104F) 1.00 45C (113F) 0.95 50C (122F) 0.90 55C (131F) 0.85 60C (140F) 0.
45、80 65C (149F) 0.74 70C (158F) 0.67 11.2.2 For applications where the ambient temperature is lower than the minimum limits per 11.1.1a and 11.1.1b or at altitudes greater than 6600 feet (2000 meters), consult the manufacturer. 11.2.3 Unless specifically designed for such use, do not locate busway so
46、that it is exposed to dust, vapors, abnormal vibration, shock, or other such unusual operating conditions. A busway should not be installed in wet locations or outdoors unless specifically identified as an outdoor busway. Copyright 2010 by the National Electrical Manufacturers Association. NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION 1300 NORTH 17TH STREET, SUITE 900 ROSSLYN. VA 22209www.NEMA.orgTO ORDER ADDITIONAL NEMA STANDARDS VISITWWW.GLOBAL.IHS.COM OR CALL 1-800-854-7179/1-303-397-79565612_0514TB
