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UL 508
ISBN 0-7629-0404-6
Industrial Control Equipment
DECEMBER 2, 2003 − UL 508
tr1
Underwriters Laboratories Inc. (UL)
333 Pfingsten Road
Northbrook, IL 60062-2096
UL Standard for Safety for Industrial Control Equipment, UL 508
Seventeenth Edition, Dated January 28, 1999
Revisions: This Standard contains revisions through and including December 2, 2003.
Summary of Topics
The revision of UL 508 is being issued to include requirements proposed in the February 25,
2003 Meeting Report and the August 28, 2003 Comment Resolution bulletin.
These revisions cover:
• Enclosure Types 3RX, 3SX, and 3X
• Color coding of grounded circuit conductors
• Grounding of metal switch plates for outlet box mounted devices
• Printed wiring board abnormal test
• Miscellaneous revisions – Scope
• Miscellaneous revisions – Notation of conductor gauge
• Miscellaneous revisions – Updating references to the National Electrical Code (NEC)
• Combination motor controllers – Current withstand test
• Supported and unsupported enclosure surfaces
• Minimum spacings between traces of opposite polarity on printed wiring boards
• Thermocouples
• Temperature test
• Supplementary insulation
• Markings
• Overload and Endurance Tests
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(SGML). SGML -- an international standard (ISO 8879-1986) -- is a descriptive markup language that
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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.
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DECEMBER 2, 2003 − UL 508
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 following table lists the future effective dates with the corresponding reference.
Future Effective Dates
December 17, 2003
December 12, 2004
References
76.3.1, 77.5, and 88.2.2 – 88.2.4
Paragraphs 36.1, 50.1.7 – 50.1.9, 76.12, 106.3, 106.4, 108.3,
109.1, Table 109.1, Table 110.1, Table 111.1, Section 114,
Section 115, and Section 116.
The new and/or revised requirements are substantially in accordance with UL’s Bulletin(s) on this subject
dated February 25, 2003 and August 28, 2003. The bulletin(s) is now obsolete and may be discarded.
The revisions dated December 2, 2003 include a reprinted title page (page1) for this Standard.
The revisions dated July 16, 1999 include an editorial change in title for UL 489, Standard for
Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit Breaker Enclosures.
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.
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of Defense.
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DECEMBER 2, 2003 − UL 508
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REQUIREMENTS″ notice.
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Copyright © 2003 Underwriters Laboratories Inc.

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