UL-508-BULLETINS-2003.pdf
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1、Subject 508 (in reply, refer to Subject 508) 12 Laboratory Drive Research Triangle Park, NC 27709 August 28, 2003 TO: Standards Technical Panel (STP) for Industrial Control Equipment, STP 508; Subscribers to ULs Standards Service for Industrial Control Equipment SUBJECT: Comments and Substantive Cha
2、nges received on the ANSI Canvass of the February 25, 2003 Meeting Report for the Seventeenth Edition of the Standard for Industrial Control Equipment, UL 508; SUMMARY OF TOPICS The attached comment matrix contains the comments received on the February 25, 2003 meeting report, responses to comments,
3、 and substantive changes resulting from those comments. Substantive changes have been proposed for the following topics included in the UL 508 meeting report: Topic I I: Switches With Identified “OFF Position Topic 13: Printed Wiring Board Abnormal Test Topic 18: Supported And Unsupported Enclosure
4、Surfaces Topic 27: Float Operated Switch Type Rating COMMENTS DUE: September 25,2003 The attached comment matrix provides the comment dispositions from the canvass of the meeting report dated February 25, 2003. The ballots were due to the Secretary by April 28, 2003. A follow-up letter was sent to t
5、he STP dated May 1, 2003 with ballots due by May 15, 2003. The matrix contains all of the comments that were received. The effective dates are the same as stated in the meeting report dated February 25, 2003 unless noted otherwise. If you wish to change your vote in light of the dispositions/actions
6、 or the proposed changes, please respond to us in writing by September 25, 2003. If we do not hear from you by this date, your original vote will be maintained. SUBJECT 508 -2- AUGUST 28,2003 UL has determined that initial consensus has been achieved for items 6, 7, IO, 12, 13, 14, 15A, 15B, 15C, 16
7、, 18, 19, 20, 21, 23, and 25 regarding the ANSI approval of the proposed revisions to UL 508. Items 4, 5, 8, and 9 failed to reach consensus by approval of at least a majority of the membership. As such, these items may be reballoted in the next revision cycle. Items 11 and 27 may be adopted based u
8、pon the outcome of the proposed revisions in this bulletin. If the STP concurs with the dispositions/ actions and proposed revisions and consensus is achieved, UL plans to adopt the revised version of UL 508 as an ANSI standard. You have the right to appeal this action on a procedural basis through
9、ULs Appeals Process. If you wish to appeal, please respond by September 25, 2003. Guidelines on how to register an appeal can be obtained on http:/ or by contacting the STP Secretary. UL appreciates the time and effort you have put forth to review this standard, and look forward to your continued pa
10、rticipation in this UL/ANSI standard activity. UNDERWRITERS LABORATORIES INC. REVIEWED BY: WARREN CASPER JOHN THOMPSON Secretary for STP 508 Chair for STP 508 Standards Department Global Standards RESEARCH TRIANGLE PARK DIVISION RESEARCH TRIANGLE PARK DIVISION Phone: (91 9) 549-1 543 Phone: (91 9) 5
11、49-1 621 Fax: (919) 547-6185 Fax: (919) 547-6251 E-mail: Christopher.W.C E-mail: http:/ Copyright O 2003 Underwriters Laboratories Inc. SR: SAB SUBJECT 508 -Al- AUGUST 28,2003 APPENDIX A COMMENTS MATRIX The Table below provides the comment dispositions from the Ballot of BSRIUL 508, meeting report
12、dated February 25,2003. The Standard for Industrial Control Equipment. STP Secretary: Warren Casper, Phone: (91 9) 549-1 543, Fax: (91 9) 547-61 85, E-mail: Christopher.W.C STP Chair: John Thompson, Phone: (919) 549-1621 The columns in the comment resolution matrix can be defined as follows: Comment
13、 Submitter Para. # / Text Ref. Comment Action Name of person who submitted comment. Indicates the specific reference for the comment This comment matrix presents a summary of the comment and the suggested wording of proposals. The action, such as accepted or disagree, and the justification for the a
14、ction, if needed. Disposition The disposition such as resolved or unresolved. SUBJECT 508 -A2- AUGUST 28,2003 Topic 6: Enclosure Types 3RX, 3SX, and 3X Comment Submitter Brian Rock Hubbell Incorporated Paragraph I Text Reference Table 6.7, 6.5.5, 5.15.1.1, 6.15.5, 6.15.6, 5.15.7, 6.15.12, 7.2.1, 3.4
15、, 8.7, 11.3, 11.4, 11.6, 11.8, 11.10, 11.13, and 25.6.6 Comment or Comment Summary I fully concur with the inclusion of Enclosure Types 3X, 3SX, and 3RX in UL 508, as proposed. Furthermore, I support ULs position that the Enclosure Type rating reflects the performance of the enclosure itself in the
16、context of the proposed paragraphs, particularly with regard to Type 3R. As with any INDIVIDUAL product bearing an Enclosure Type rating, it is a component in a complete assembly of products wherein EACH component comprising that TOTAL enclosure installation must have the same or better Enclosure Ty
17、pe rating to maintain the integrity of that Enclosure Type rating. The issue of ventilation of Type 3RX has no different impact on internal components than for a Type 4X enclosure with a Type 4X Listed “breather“ fitting; this Type 4X “breather“ fitting is evaluated and Listed to resist ingress of T
18、ype 4 hosedown water and to resist corrosion but intentionally allows passage of moisture-laden air, typically to allow internal humidity to escape from the Type 4X installation rather than becoming entrapped condensate. If there is concern about components fully internal to the enclosure in a parti
19、cular installation, they too can be selected from those also so rated for corrosion resistance. Addition of Enclosure Types 3X, 3SX, and 3RX in NEMA Standard 250 and in NEC Table 430.91 was based upon ample field history in humid climates where typically Type 3R enclosures in particular have rusted
20、to the point of compromising electrical enclosure integrity while the electrical circuits inside remained functional, energized and accessible to personal contact through deteriorated, unmaintained enclosure ruptures. While this Table 430.91 within the context of the NEC is entitled “Motor Controlle
21、r Enclosure Selection“, installations require coordination of Enclosure Type ratings for other components (fittings, interconnects, switches, etc.) attached to the electrical enclosure to maintain the environmental enclosure. As indicated in UL 508 Paragraph 6.8.3 (“Openings shall be filled by devic
22、es with suitable environmental ratings as specified in Table 6.7.“) and Table 6.7 (“Openings shall be closed by equipment rated for enclosure types“), other UL Standards, beyond UL 508, for these other products also directly reference UL 50 for Enclosure Type requirements. Accordingly, requirements
23、and definition of Enclosure Types 3X, 3RX, and 3SX belona first and foremost in UL 50. ActionlDisposition UL is aware of the new type ratings and intends to propose these in the next proposal bulletin to STP 50. Table Continued on Next Page SUBJECT 508 Zomment or Comment Summary Wirrnative editorial
24、 comment: The Exception -A3- ActionlDisposition This requirement AUGUST 28,2003 Table Continued Comment or Comment Summary I Comment Submitter Paragraph l Text I Reference While my STP 508 Ballot is voted as affirmative, it is so with the expectation as a member of both STP 508 and STP 50 that UL 50
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