Subject 508C (61800-5-1, 61800-5-2)

Bulletin Dated: March 31, 2017

SUMMARY OF TOPICS

The following topics were discussed at the meeting of the Standards Technical Panel for Power Conversion Equipment:

1. Update on current projects for the Standard for Power Conversion Equipment, UL 508C

2. Update on current projects for the Standard for Adjustable Speed Electrical Power Drive Systems - Part 5-1: Safety Requirements - Electrical, Thermal and Energy, UL 61800-5-1

3. Update on the Standard for Adjustable Speed Electrical Power Drive Systems - Part 5-2: Safety Requirements - Functional, UL 61800-5-2

4. Update from the Servo Drive Amplifier Task Group

5. Update from the IGBT Task Group and discussion of the following proposal to serve as preliminary review: Use of thermistors to comply with 5.1.5DV

6. Update from the Multiple Motors Task Group and discussion of the following proposal to serve as preliminary review: CDM/BDM controlling multiple motors

7. Update from the Drives with Power and Control Cable Assemblies Task Group

8. Update from the Spacings Task Group and discussion of the following proposal to serve as preliminary review: Clarification of Spacings and Internal Wire Insulation for Rectified AC Voltages

9. Update from the DC Bus Connection Task Group

10. Update from the Drive Tap Conductor Protection Task Group

11. Update from the UL 61800-5-2 Task Group

12. Update from the Test Reduction Task Group

13. Discussion of the following proposal to serve as preliminary review: Revision to the requirements for across-the-line capacitors

14. Discussion of the following proposal to serve as preliminary review: Slash and Straight Voltage Ratings for Drives with a 3 Phase Input

15. Discussion of the following proposal to serve as preliminary review: Control Circuit Transformer Protection

16. Discussion of the following proposal to serve as preliminary review: Signal Words

17. Discussion of the following proposal to serve as preliminary review: Revision to the conductor temperature limit during the Temperature Test, Section 40

18. Discussion of the following proposal to serve as preliminary review: Component Analysis for Breakdown of Components Test

19. Discussion of the following proposal to serve as preliminary review: Dust test requirement for equipment rated other than Type 1, 2, 3R, and 3RX

20. Discussion of the following proposal to serve as preliminary review: Clarification of deflection test prior to clearance measurement

21. New business: UL 484, UL 1998, and IEC 60335

22. New business: UL 1066 Requirements