July 3, 2013
To:
Standards Technical Panel (STP) for Intrinsically Safe Apparatus and Associated Apparatus for
Use in Class I, II, and III, Division 1, Hazardous (Classified) Locations;
Subscribers to UL’s Listing Service for Intrinsically Safe Apparatus and Associated Apparatus
for Use in Class I, II, and III, Division 1, Hazardous (Classified) Locations;
Applicants of equipment covered by UL 913, Intrinsically Safe Apparatus and Associated
Apparatus for Use in Class I, II, and III, Division 1, Hazardous (Classified) Locations; and
Multiple and Alternate Listees of UL Listed Intrinsically Safe Apparatus and Associated
Apparatus for Use in Class I, II, and III, Division 1, Hazardous (Classified) Locations
Subject: Implementation of Continuing Certification Program for Intrinsically Safe Apparatus and
Associated Apparatus for Use in Class I, II, and III, Division 1, Hazardous (Classified)
Locations, and
Cancellation of the Industry File Review for the 7th edition of UL 913, Intrinsically Safe
Apparatus and Associated Apparatus for Use in Class I, II, and III, Division 1, Hazardous
(Classified) Locations
BACKGROUND
This Bulletin is to inform you that UL has introduced the Continuing Certification approach to the
Standards Technical Panel for UL 913, and that STP 913 has voted on the implementation of the
changes associated with the subject requirements.
In the past, when UL transitioned from one set of requirements to another, an Industry File Review (IFR)
would be conducted involving all currently certified products evaluated to those requirements. However,
since the revisions to the requirements for the 7th edition, and upcoming 8th edition, of UL 913 were driven
by an interest in harmonization, rather than any known safety issues, UL has developed a Continuing
Certification approach to maintaining certification of equipment to such requirements.
Under this Continuing Certification approach, the Standards Technical Panel (STP) responsible for the
development and approval of the involved requirements has a voice in determining the implementation of
the requirements. As STP 913 is the STP responsible for the development and approval of the
requirements associated with UL 913, UL requested that each STP member vote on the implementation
of the changes associated with the subject requirements.
The result of this vote is that the change in requirements between the 5th edition of UL 913 and the 7th
edition of UL 913, and between the 7th edition of UL 913 and the upcoming 8th edition of UL 913, do not
warrant all apparatus and associated apparatus presently certified to either the 5th or 7th editions of UL
913 to be brought into compliance with either the 7th or upcoming 8th editions of UL 913 respectively. The
rationale for this position is that the requirements of the 7th and upcoming 8th editions of UL 913 are not
substantially different with respect to safety than the previous editions (refer to UL CSDS work area
opened 2013-05-17 for additional details).
Consequently, UL need not conduct either a 7th or 8th edition UL 913 Industry File Review on Intrinsically
Safe Apparatus and Associated Apparatus for Use in Class I, II, and III, Division 1, Hazardous (Classified)
Locations, and the existing Industry File Review (IFR) for compliance with the 7th edition of UL 913 is
being
cancelled.
CONTINUING CERTIFICATION APPROACH
The result of this vote has also set the future schedule for the transition from the 5th to the 7th to the
upcoming 8th editions of UL 913, and the future use of these three editions of the standard as follows:

On 1 September 2018, the 5th and 7th editions of UL 913 will both be withdrawn. No further new
certifications of US Division 1 intrinsically safe apparatus and associated apparatus involving the 5th
or 7th editions of UL 913 will be allowed after this date.

After 1 September 2018, only the 8th edition of UL 913 can be used for establishing new certifications
of US Division 1 intrinsically safe apparatus and associated apparatus.

Existing certifications of US Division 1 intrinsically safe apparatus and associated apparatus to the 5th
and 7th editions of UL 913 will be allowed to continue after 1 September 2018. These certifications
will not be withdrawn provided there are no changes to the design of the apparatus that require a
certification decision to determine compliance. Changes that require a certification decision to
determine compliance will require an evaluation of the apparatus, in its entirety, to the 8th edition of
UL 913.
This schedule enables manufacturers to transition to the 8th edition of UL 913 based on their own
schedule and their market demands. It will also allow manufacturers to continue producing intrinsically
safe apparatus and associated apparatus certified to the 5th and 7th editions of UL 913 provided there are
no changes made to the apparatus that require a certification decision.
The Summary of Requirements addresses the new and/or revised requirements and is accessible via the
following link: https://ifs.ul.com/ifr/ifr.nsf. The Summary of Requirements for specific reviews are located
on the left hand side of the screen. Using the search function, you can search for these documents by
the Announcement Letter Date of the initial file review, Effective Date or Standard Number/Subject
Number.
Questions regarding this matter should be directed to John Zaplatosch at (847) 664-3621 or at
<John.A.Zaplatosch@ul.com>.
Visit the following link for additional information regarding the Continuing Certification approach
http://www.ul.com/global/documents/offerings/industries/powerandcontrols/resources/Continuing_Certification
_Announcement_012913.pdf.
Respectfully,
WILLIAM R. CARNEY
Director, Global Chief Engineer
North American Certification Programs Office