Summary of Topics

Revision pages have been issued for the Standard for Safety for Medium Voltage Power Conversion Equipment, UL 347A, to incorporate the following:

• Editorial Correction to Table 19.1

• Addition of Section 19.6 Covering Circuits Provided with Solid Insulation

• Replacing References to UL 347B with References to UL 347

• Clarification of Short Circuit Test Requirements for Bypass Circuits

• Addition of Series Connected Component Spacings for 600 V and Below

• Clarification of Scope to Reference UL 347 for Solid State Reduced Voltage Starters

• Capacitor Discharge Test in UL 347A

• Clarification of Clause 14.1 - Interlocking Requirments

• Editorial Revision to Clause 15.1

• Revision to Clause 15.4

• Editorial Revision to Clause 19.3.2.1

• Revision to Clauses 19.4.1 & 19.5.1, Changing Reference to UL 61800-5-1

• Revisions to Impulse Testing when No Isolating Means is Provided

• Revisions to Operation Tests

• Editorial Revisions to Table 19.3

• Breakdown of Components Test - Clarification of Test Method