Standard 1951, Edition 2
Red Line
February 27, 2017
UL 1951

Standard for Electrical Plumbing Accessories

UL Red Line Edition 2 Published Date: February 27, 2017 Last Revision: June 27, 2020
Summary of Topics s1951_2_sum.html

SUMMARY OF TOPICS

These revisions to ANSI/UL 1951 include the following changes in requirements:

•Update requirements for capacitors

•Update requirements for Switch-Mode Power Supplies

•Update requirements for switches

•Allow the use of UL 840 to evaluate clearance and creepage distances

•Add specifications for Safety Critical Functions

•Revise requirements for electronic circuits
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