Fused Power-Circuit Devices

Available format(s)

Hardcopy

Published date

04-30-2012

Publisher

Underwriters Laboratories

FOREWORD
INTRODUCTION
1. Scope
2. Components
3. Units of Measurement
4. References
CONSTRUCTION
5. General
6. Enclosure
7. Ventilation
8. Sheet-Metal Enclosures
9. Doors and Covers
10. Hinges
11. Latches
12. Operating Mechanism
13. Ground Fault Protection
14. Insulating Material
15. Current-Carrying Parts
16. Wiring Terminals
17. Control Circuit
18. Lockout
19. Fusing
20. Spacings
21. Wiring space
22. Disconnecting Means
23. Provision for Grounding
24. Provision for Bonding
PERFORMANCE
25. General
26. Temperature Test
27. Strength of Insulating Base and Support
28. Overvoltage Test
29. Water Spray Test
30. Operation Test
31. Endurance Test
32. 200-Percent Overload
33. Dielectric Voltage-Withstand Test
34. Close-Open Test
35. Dielectric Voltage-Withstand (Repeated) Test
36. Contact Opening Test
37. Dielectric Voltage-Withstand (Repeated) Test
38. Short-Circuit Withstand Test
39. Closing Test
40. Low-Level Dielectric Voltage-Withstand Test
41. Metallic Coating Thickness Test
INSTRUMENTATION AND CALIBRATION OF HIGH-CAPACITY CIRCUITS
42. Galvanometers
43. Circuit Measurement Verification
44. Calibration of Test Circuit
MANUFACTURING AND PRODUCTION TEST
45. Operation
RATINGS
46. Current
47. Voltage
48. Withstand
49. Control Circuit
MARKING
50. Details
INSTALLATION TEST PROCEDURES
51. Details
APPENDIX A
Standards for Components

This revision to ANSI/UL 977 dated October 26, 2020 includes barriers to address inadvertent contact on line side of service disconnect; Section 24A and 50.37

These requirements cover fused power-circuit devices to be employed in accordance with the National Electrical Code.

DevelopmentNote	NEW CHILD REV 2 2020 IS ADDED
DocumentType	Standard
Pages	0
ProductNote	NEW CHILD REV 2 2020 IS ADDED
PublisherName	Underwriters Laboratories
Status	Current

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UL 977:5ED 2012-04

Current

Table of Contents

Abstract

Scope

General Product Information

Standards Referenced By This Book

Standards Referencing This Book

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