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Case Study: THC 17B23E Clive Kimblin
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Case Study: THC 17B/23E. Clive Kimblin. Development of the equivalent standard. 'Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit Breaker Enclosures. ... – PowerPoint PPT presentation
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Title: Case Study: THC 17B23E Clive Kimblin
1
Case Study THC 17B/23E
Clive Kimblin
- Development of the equivalent standard.
- Molded-Case Circuit Breakers, Molded-Case
Switches, and Circuit Breaker Enclosures. - (Published April 25, 2002).
2
Value
- Requirements for all three countries within a
single cover. - Those requirements are essentially identical.
- Exceptions
- Markings
- Background References
- Enclosures
3
Value (cont.)
- Similar to IEC format
- Metric units first
- Opportunity to focus on the future.
- Where do we go from here?
- Rather than the past
- Can we complete the Tri-National Standard?
- Should we complete the Tri-National Standard?
4
History
- November 1988
- Initial Meeting
- Canadian consultants compare content of UL/CSA
Standards. - 1992 CANENA involvement
- 1994 Draft Tri-National completed.
- (Jerry De Angelo THC Chair)
- 1994 Draft sent to the three SDOs.
5
History (cont.)
- Problems/delays due to
- Resolution of certain technical differences.
- Resolution of reference issues.
- Lack of knowledge of the approval systems within
individual countries.
6
History (cont.)
- July 1995 U.S. circulates the draft as the
basis for the Ninth Edition UL 489. - July 1996 UL 489 (9th edition published).
- Good news an updated standard
- Bad news reduction in incentive to complete
Tri-National. - 1999 Mexico publishes, NMX-J-266-ANCE-1999
- First Edition (in Spanish) based on the Draft.
7
History (cont.)
- 1996 - 2001
- THC/SDOs resolve issue of Reference - Standards.
- THC/SDOs resolve enclosure issues.
- April 25th, 2002 equivalent standard published.
- UL 489
- CSA C22.2 No. 5-02
- NMX-J-266-ANCE 2002 (to follow, in Spanish)
8
Lessons Learned
- THC members should start young!
- THC must use consensus process.
- It is essential that the members understand the
approval system for each individual country. - Communication, communication, communication
- THC Level
- SDO-SDO-SDO
- SDO with Individual-Country Approval System
- Committed Publication Coordinator
9
Immediate Future Challenges
- Deal with the back-log of changes using THC
guidance.
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Longer Term Challenge
- Consider the relationship to IEC 60947-2.
- Essential differences within the North American
System.
11
Conclusions
- It has been a long journey - far too long.
- The first goal has been reached.
- Equivalent Standard
- The THC, and the SDOs, now have the opportunity
to focus on the future.
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