Subject 347A

Bulletin Dated: July 25, 2016

SUMMARY OF TOPICS

The following changes in requirements to the Standard for Medium Voltage Power Conversion Equipment, UL 347A, are being proposed for preliminary review and comment only:

1. For Preliminary Review Only: Editorial Correction to Table 19.1

2. For Preliminary Review Only: Addition of Section 19.6 Covering Circuits Provided with Solid Insulation

3. For Preliminary Review Only: Replacing References to UL 347B with References to UL 347

4. For Preliminary Review Only: Clarification of Short Circuit Test Requirements for Bypass Circuits

5. For Preliminary Review Only: Addition of Series Connected Component Spacings for 600 V and Below

6. For Preliminary Review Only: Clarification of Scope to Reference UL 347 for Solid State Reduced Voltage Starters

7. For Preliminary Review Only: Capacitor Discharge Test in UL 347A

8. For Preliminary Review Only: Clarification of Clause 14.1 - Interlocking Requirments

9. For Preliminary Review Only: Editorial Revision to Clause 15.1

10. For Preliminary Review Only: Revision to Clause 15.4

11. For Preliminary Review Only: Editorial Revision to Clause 19.3.2.1

12. For Preliminary Review Only: Revision to Clauses 19.4.1 & 19.5.1, Changing Reference to UL 61800-5-1

13. For Preliminary Review Only: Revisions to Impulse Testing when No Isolating Means is Provided

14. For Preliminary Review Only: Revisions to Operation Tests

15. For Preliminary Review Only: Editorial Revisions to Table 19.3