Subject 1449

Bulletin Dated: May 9, 2019

SUMMARY OF TOPICS

The following changes in requirements to the Standard for Surge Protective Devices, UL 1449, are being proposed for preliminary review and comment only:

1. For Preliminary Review Only: Clarification in Clause 1.1 to Define MOV

2. For Preliminary Review Only: Expansion of Scope Paragraph 1.1

3. For Preliminary Review Only: Use of the Term "Type"

4. For Preliminary Review Only: Addition of Clause 1.19 to Specify Ambient Temperature

5. For Preliminary Review Only: Revision to Clause 3.18 Defining MLV

6. For Preliminary Review Only: Addition of Acronym for Clause 3.23

7. For Preliminary Review Only: Clarification of Clause 3.48 - SPD Types Using VPR

8. For Preliminary Review Only: Add New Definition Clause 3.46.1 - Type 2 Voltage-Limiting SPD

9. For Preliminary Review Only: Add New Definition Clause 3.46.2 - Type 2 Voltage-Switching SPD

10. For Preliminary Review Only: Revision to 7.2.1.2 - Openings in an Enclosure for Type 3 SPDs

11. For Preliminary Review Only: Addition of New Table 12.3 to Replace Clauses 12.3 - 12.11

12. For Preliminary Review Only: Revision to Allow Terminal Blocks Tested to UL 1059

13. For Preliminary Review Only: Addition of Clauses 19.5 - 19.7 for PWBs

14. For Preliminary Review Only: Additional Reference Included in Clause 27.2

15. For Preliminary Review Only: Clarification that the Same External OCP Be Included in Series with the SPD for All Testing

16. For Preliminary Review Only: Revision to Figure 36.1, Flowcharts 1-4

17. For Preliminary Review Only: Clarification to Table 36.1 to Align with Table 44.4

18. For Preliminary Review Only: Corrections to Table 36.2

19. For Preliminary Review Only: Modification of 40.1.1 Regarding Surge Testing

20. For Preliminary Review Only: Clarification of 40.5.2 Regarding when External Protection is Relied Upon to Yield Compliant Performance Test Results

21. For Preliminary Review Only: Clarification of 40.5.2 for VPR Measurement for Type 1, 2, 3 and 4 Component Assemblies

22. For Preliminary Review Only: Modification of 40.7 Regarding Nominal Discharge Current

23. For Preliminary Review Only: Revision of 40.7.1 to Include 15KA and Increments from 3-10KA

24. For Preliminary Review Only: Clarify Use of Current Generator and Proper Abbreviation in Clause 40.7.1

25. For Preliminary Review Only: Modification of 40.7.2 Regarding Nominal Discharge Currents

26. For Preliminary Review Only: Modification of 40.9.1 Regarding VPR Requirements

27. For Preliminary Review Only: Clarification to Section 41 - Type 5 SPD Surge Testing

28. For Preliminary Review Only: Clarify Testing for Integral Thermal Protection Operation Following Nominal Discharge Current Testing with Addition of Clause 42.2

29. For Preliminary Review Only: Clarification of Table 44.1 to Include Delta Systems Up to 1000V

30. For Preliminary Review Only: Clarification of 44.1.12 Pertaining to Leakage and Ground Continuity Tests After Current Tests

31. For Preliminary Review Only: Revision to 44.2.5 and 44.3.4 Related to Thermal Responsive Devices

32. For Preliminary Review Only: Clarification of Titles for Sections 46 and 47

33. For Preliminary Review Only: Clarification of Section 46 vs Section 47

34. For Preliminary Review Only: Clarify PTC-MOV Testing in Clause 50.5

35. For Preliminary Review Only: Revision to 51.11 to Include Polymeric Enclosures

36. For Preliminary Review Only: Editorial Correction in 58.1

37. For Preliminary Review Only: Revision to Clause 73D.1 to Correct a Reference

38. For Preliminary Review Only: Revision to Markings Section 80

39. For Preliminary Review Only: Revision to SA8.3 to Simplify the Test Method