Browse & Buy UL Standards
Standard 1449, Edition 4

Standard for Surge Protective Devices

UL Red Line
Standard 1449, Edition 4 Edition Date: March 26, 2015
Summary of Topics s1449_4_sum.html

Summary of Topics

Revision pages have been issued for the Standard for Safety for Surge Protective Devices, UL 1449, to reflect the latest ANSI approval date and to incorporate the proposals dated October 31, 2014 and February 20, 2015, which include the following:

• Correction to requirements in

• Definition and clarification of the use of cheesecloth and tissue paper.

• Clarifications to Sections 40 and 44.

• Clarification of Table 36.1 and Table 36.2.

• Clarification of requirements for SPDs intended for rack mounting.

• Addition of requirements for outdoor use Type 3 SPDs.

• Revision of 44.1.11(f) and 44.2.5(c).

• Revision of 44.4.1 regarding SPD temperature equilibrium.

• Addition of exception to 44.1.7 to address cheesecloth placement for enclosures with conduit openings.

Back to Standard 1449, Edition 4

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