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UL Standard for Safety for Power Converters/Inverters and Power Converter/Inverter Systems for Land
Vehicles and Marine Crafts, UL 458
Fourth Edition, Dated December 14, 1993
Revisions: This Standard contains revisions through and including October 15, 2004.
Summary of Topics
The revisions dated October 15, 2004 are being issued to incorporate requirements in
accordance with:
Responses to comments received on the Fourth Edition of UL 458, the Standard for
Power Converter/Inverter Systems for Land Vehicles and Marine Crafts, balloted for ANSI
approval in the E-mail dated April 21, 2003, and
Revisions proposed in Subject 458 bulletin dated July 9, 2004 based on the comments
received.
UL Standards for Safety are developed and maintained in the Standard Generalized Markup Language
(SGML). SGML -- an international standard (ISO 8879-1986) -- is a descriptive markup language that
describes a document’s structure and purpose, rather than its physical appearance on a page. Due to
formatting differences resulting from the use of UL’s new electronic publishing system, please note that
additional pages (on which no requirements have been changed) may be included in revision pages due
to relocation of existing text and reformatting of the Standard.
Text that has been changed in any manner is marked with a vertical line in the margin. Changes in
requirements are marked with a vertical line in the margin and are followed by an effective date note
indicating the date of publication or the date on which the changed requirement becomes effective.
The new and revised requirements are substantially in accordance with UL’s Bulletin(s) on this subject
dated July 9, 2004. The bulletin(s) is now obsolete and may be discarded.
The revisions dated October 15, 2004 include a reprinted title page (page1) for this Standard.
As indicated on the title page (page 1), this UL Standard for Safety is an American National Standard.
Attention is directed to the note on the title page of this Standard outlining the procedures to be followed
to retain the approved text of this ANSI/UL Standard.
The UL Foreword is no longer located within the UL Standard. For information concerning the use and
application of the requirements contained in this Standard, the current version of the UL Foreword is
located on ULStandardsInfoNet at: http://ulstandardsinfonet.ul.com/ulforeword.html
The master for this Standard at UL’s Northbrook Office is the official document insofar as it relates to a
UL service and the compliance of a product with respect to the requirements for that product and service,
or if there are questions regarding the accuracy of this Standard.
OCTOBER 15, 2004 − UL 458 tr1
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