Standard 1778, Edition 5
UL 1778

Uninterruptible Power Systems

UL CSDS Proposal Edition 5 Published Date: September 30, 2016 Last Revision: April 03, 2024

Summary of Topics b1778_5_20160930_sum.html

Subject 1778

Bulletin Dated: September 30, 2016


The following changes in requirements to the Standard for Uninterruptible Power Systems, UL 1778, are being proposed for preliminary review and comment only:

1. For Preliminary Review Only: Add a dated reference to UL 60950 RD

2. For Preliminary Review Only: Update references to the component requirements of the RD

3. For Preliminary Review Only: Update to Table for temperature limits

4. For Preliminary Review Only: Revision to bus bar temperature limits

5. For Preliminary Review Only: Add symbol for no telecommunication network

6. For Preliminary Review Only: Corrections in Annex NNN for short-circuit withstand rating

7. For Preliminary Review Only: Addition of requirements and figure for short circuit withstand and short circuit closing test port location

8. For Preliminary Review Only: Updates to References

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