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UL 857:13ED 2009-03

Current

Current

The latest, up-to-date edition.

Busways

Available format(s)

Hardcopy

Language(s)

English

Published date

25-03-2009

FOREWORD
INTRODUCTION
1. Scope
2. General
CONSTRUCTION
ALL PRODUCTS
3. General
4. Enclosure
5. Grounding
6. Busway Supports
7. Transverse Barriers
8. Bus Bar Supports
9. Current-Carrying Parts
10. Bus Bar Coverings
11. Wiring Terminals
12. Spacings
13. Wiring Space
VENTILATED BUSWAY
14. Enclosure
15. Bus Bar Coverings
16. Spacings
UNVENTILATED BUSWAY
17. Enclosure
TROLLEY BUSWAY
18. General
19. Enclosure
PLUG-IN BUSWAY AND FITTINGS
20. General
21. Enclosure
OUTDOOR BUSWAY AND FITTINGS
22. General
23. Enclosure
FITTINGS
24. General
25. Fittings Suitable for Use as Service Equipment
26. Enclosure
27. Live Parts
28. Spacings
SHORT-RUN BUSWAY
29. General
30. Enclosure
31. Busway Supports
32. Bus Bar Supports
33. Current Carrying Parts
34. Spacings
35. Ratings
36. Markings
PERFORMANCE
37. Heating Test
38. Endurance Test of Trolley Busway
39. Electrical Conductivity Test
40. Enclosure Joint Short-Time Fault Current Test
41. Overload and Endurance Tests
42. Resistance to Aging Test
43. Dielectric Voltage-Withstand Tests
44. Resistance to Impact Test
45. Resistance to Bending Test
46. Resistance to Crushing Test
47. Bus-Bar Pullout Test
48. Strain Relief Test
49. Metallic Coating Thickness Test
50. Insulation Resistance And Dielectric Voltage-Withstand
     after Exposure to Rain Tests
51. Short Circuit Test
52. Short Circuit Test at Reduced Voltage
53. Strength of Insulating Base and Support Test
RATINGS
54. General
MARKINGS
55. General
56. Permanence of Marking
INSTALLATION INSTRUCTIONS
57. Field Testing of Ground Fault Protection of Equipment
APPENDIX A
Standards for Components

This revision of ANSI/UL 857 dated April 9, 2021 is being issued to update the title page to reflect the most recent designation as a Reaffirmed American National Standard (ANS).

1 1.1 This Standard applies to service-entrance, feeder, and branch-circuit busways and associated fittings rated at 600 V or less, 6 000 A or less, and intended for use in accordance with the Canadian Electrical Code, Part I (CE Code, Part I), the National Electrical Code (NEC), NFPA 70, and the Mexican Standard for Electrical Installations (Utility), NOM-001-SEDE, (see Annex B, Reference Item No. 1).

DevelopmentNote
Supersedes NEMA BU 2. (08/2001) Also numbered as CSA C22.2.27 & ANCE NMX-J-148. (03/2009)
DocumentType
Standard
Pages
0
PublisherName
Underwriters Laboratories
Status
Current
Supersedes

IEEE C37.23-2003 IEEE Standard for Metal-Enclosed Bus
NFPA 70B:2023 Standard for Electrical Equipment Maintenance
NEMA BU 1.2:2002(R2013) Application Information for Busway Rated 600 V or Less
IEEE 141 : 1993 IEEE Recommended Practice for Electric Power Distribution for Industrial Plants
NEMA BU 2 : 1996 MAJOR REQUIREMENTS RELATED TO THE APPLICATION AND TESTING OF LOW VOLTAGE BUSWAY
UL 183:4ED 2009-09 Manufactured Wiring Systems
NFPA 70 : 2017 NATIONAL ELECTRICAL CODE
IEEE 241 : 1990 ELECTRIC POWER SYSTEMS IN COMMERCIAL BUILDINGS
IEEE 3001.5-2013 IEEE Recommended Practice for the Application of Power Distribution Apparatus in Industrial and Commercial Power Systems
IEEE 242-2001 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems (IEEE Buff Book)

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