UL-414-BULLETIN-2007=14P.pdf
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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 414 November 20, 2007 SUMMARY OF TOPICS The following changes in requirements are being proposed: 1. For Preliminary Review Only: Requirements for Current Carrying Part of Potential Jaw Assembly 2. For Preliminary Review Only: Upd
2、ate of Conduit Trade Size in Ampacity Table 7.1 3. For Preliminary Review Only: Addition of Requirements for Anti-Rejection Clips 4. For Preliminary Review Only: Clarifi cation to Requirement for Heating Test in Paragraph 13.16 for Meter Bypass 5. For Preliminary Review Only: Inclusion of Reference
3、to Wiring Space Requirements for Metering Transformer Cabinets in Paragraph 40.1.1 6. For Preliminary Review Only: Addition of Appendix for Explanatory Information Regarding Wire Bending Distance (Section 10) COMMENTS DUE: December 6, 2007 This proposal is for review and comment only (no ballot at t
4、his time). Please note that comments on a preliminary review document will not receive a response from the proposal author through CSDS. Instead, the proposal author will be asked to review the comments and adjust the proposals and/or supporting rationale as the author determines to be appropriate.
5、The preliminary review process is an informal mechanism that provides authors with the opportunity to refi ne their proposals before they advance to the next stage in ULs standards development process. In some cases, the author of the proposals may choose to discontinue them. In this case, the autho
6、r need not do anything after preliminary review has ended. Normally, the next step in the process is the more formal STP ballot and stakeholder review process. Only comments posted during the STP ballot and stakeholder review process will be provided with a response in CSDS. For your convenience in
7、review, proposed additions to existing requirements are shown underlined and proposed deletions are shown lined-out. 1. For Preliminary Review Only: Requirements for Current Carrying Part of Potential Jaw Assembly BACKGROUND This proposal was discussed during the meeting of the Standards Technical P
8、anel for Meter Mounting Equipment, STP 414, in Columbus, Ohio on April 19, 2007. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 19:12:53 MSTNo reproduction or networking permitted without lic
9、ense from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION RATIONALE Proposal submitted by: Robert Osborne, UL Potential jaws, while technically a current carrying part, do not carry load current. STP members indicated their concern that the current carrying components of pote
10、ntial jaw assemblies should comply with the same constructional requirements applied to other current carrying parts to ensure accurate measurement by the watthour meter. To ensure these requirements are applied to potential jaw assemblies, a revision is proposed to specifi cally cover those parts a
11、ssociated with a potential jaw assembly. PROPOSAL 6.1.1 A All current-carrying part parts, including those associated with a potential jaw assembly, shall be of: a) Silver; b) A silver alloy; c) Copper; d) A copper alloy; e) Aluminum; or f) Aluminum alloy. Exception No. 1: A current-carrying part us
12、ed only to bypass a meter may be plated steel if determined to be acceptable for the purpose in accordance with the Heating Test, Section 13. Exception No. 2: A plated No. 10 (4.8 mm diameter) or larger wire-binding screw or nut and stud terminal may be fabricated of iron or steel. 2. For Preliminar
13、y Review Only: Update of Conduit Trade Size in Ampacity Table 7.1 BACKGROUND This proposal was discussed during the meeting of the Standards Technical Panel for Meter Mounting Equipment, STP 414, in Columbus, Ohio on April 19, 2007. RATIONALE Proposal submitted by: Robert Osborne, UL Conduit sizes i
14、n Table 7.1 no longer match those in the National Electrical Code. As noted in Paragraph 13.4 of UL 414, the testing is conducted with rigid steel conduit. Based on footnote “a” in Table 7.1 of UL 414, conduit size is based on the use of Type THW conductors. Coordinating these values with those in T
15、able C.8 of the 2005 Edition of the NEC results in changes for conduit sizes in multiple locations. PROPOSAL NOVEMBER 20, 2007SUBJECT 414-2- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 19:
16、12:53 MSTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Table 7.1 Ampacity of insulated conductors Size,Conduit trade size inches fora Temperature rating of conductor 75C (167F)90C (194F)b AWG or kcmil (mm2)3 Wires
17、4 WiresCopperAluminumCopperAluminum 142.11/21/21520 123.31/21/220152015 105.31/21/2 3/430253025 88.43/41 3/450405545 613.31 3/4165507560 421.211-1/485c65c9575 326.71-1/4 11-1/4100c75c11085 233.61-1/41-1/4115c90c130100 142.41-1/41-1/2130c100c150115 1/053.51-1/22150c120c170135 2/067.41-1/22175c135c195
18、150 3/085.022200c155c225175 4/0107.022-1/2230c180c260205 kcmil 2501272-1/2 22-1/2255c205c290230 3001522-1/23285c230c320255 3501772-1/23310c250c350280 4002033 2-1/23335c270c380305 50025333-1/2380c310c430350 60030433-1/2420c340c475385 7003553-1/24460375520420 7503803-1/24475385535435 8004053-1/2449039
19、5555450 9004563-1/24520425585480 100050645545445615500 125063355590485665545 150076056625520705585 175088756650545735615 2000101356665560750630 NOTES 1 For a multiple-conductor connector at a terminal, the value is to be multiplied by the number of 1/0 AWG and larger conductors that the terminal wil
20、l accommodate. 2 These values of ampacity apply only if no more than three conductors will be fi eld-installed in the conduit. If four or more conductors, other than a neutral that carries the unbalanced current, will be installed in a conduit (as may occur because of the number of conduit hubs prov
21、ided or because of the number of wires necessary in certain polyphase systems or for other reason), the ampacity of each of those conductors is reduced as shown in Table 7.2. a Conduit size based on use of conductors having insulation thickness comparable to that of Type THW conductors and with cond
22、uit hubs or knockouts provided in the enclosure. b A meter socket may be rated for use with conductors on the line side having 90C (194F) ampacity under the following conditions: 1) Tested in accordance with Exception No. 3 to 13.6, with temperature rise limits as specifi ed in 13.3. 2) Marked in ac
23、cordance with 25.10.5. NOVEMBER 20, 2007SUBJECT 414-3- Table 7.1 Continued on Next Page Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 19:12:53 MSTNo reproduction or networking permitted with
24、out license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Table 7.1 Continued Size,Conduit trade size inches fora Temperature rating of conductor 75C (167F)90C (194F)b AWG or kcmil (mm2)3 Wires4 WiresCopperAluminumCopperAluminum c With respect to Exception No. 4 to 13.
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