Browse & Buy UL Standards
Standard 1951, Edition 2

Standard for Electrical Plumbing Accessories

UL Red Line
Standard 1951, Edition 2 Edition Date: February 27, 2017
Summary of Topics s1951_2_sum.html


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

Back to Standard 1951, Edition 2

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.