Browse & Buy UL Standards
Standard 1778, Edition 5

Uninterruptible Power Systems

UL CSDS Proposal
Standard 1778, Edition 5 Edition Date: September 30, 2016
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

Back to Standard 1778, Edition 5

The cost to purchase this Standard varies depending on whether you are ordering a hardcopy, PDF or combination of the two. We also offer two different types of subscriptions: a one year and a three year.

You will be able to choose your purchase options on the following pages.


You have one or more subscriptions that will expire soon.


You have one or more licenses to assign


Additional information required

To serve you better, please update your account details.