UL 857:13ED 2009-03-25
Current
The latest, up-to-date edition.
Busways
Hardcopy
English
25-03-2009
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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).
| 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 |
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).
| 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 2009-09-22 | 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) |
| UL 50:13ED 2015-10-16 | Enclosures for Electrical Equipment, Non-Environmental Considerations |
| UL 977:5ED 2012-04-30 | Fused Power-Circuit Devices |
| UL 248-8:3ED 2011-05-13 | Low-Voltage Fuses - Part 8: Class J Fuses |
| UL 869A:4ED 2006-11-10 | Standard for Reference Standard for Service Equipment |
| UL 83:16ED 2017-07-28 | Standard for Thermoplastic-Insulated Wires and Cables |
| UL 248-12:3ED 2011-05-13 | Low-Voltage Fuses - Part 12: Class R Fuses |
| UL 248-4:2ED 2000-08-01 | Low-Voltage Fuses - Part 4: Class CC Fuses |
| UL 248-10:3ED 2011-05-13 | Low-Voltage Fuses - Part 10: Class L Fuses |
| UL 746A:6ED 2012-09-06 | Polymeric Materials - Short Term Property Evaluations |
| UL 1332:5ED 2016-02-12 | Organic Coatings for Steel Enclosures for Outdoor Use Electrical Equipment |
| UL 4248-15:1ED 2007-02-28 | Fuseholders - Part 15: Class T |
| UL 4248-4:1ED 2007-02 | Fuseholders - Part 4: Class CC |
| UL 414:9ED 2016-01-05 | Meter Sockets |
| UL 248-5:2ED 2000-08-01 | Low-Voltage Fuses - Part 5: Class G Fuses |
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