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1、Subject 1277 1285 Walt Whitman Road Melville LI NY 11747-3081 July 21, 2003 TO: SUBJECT: Standards Technical Panel for POWER CABLES - STP 83 Subscribers to ULs Standards Service for Electrical Power and Control Tray Cables with Optional Optical-Fiber Members - UL 1277, 4th ed Public Review Participa
2、nts Disposition of ANSI Canvass Comments on Proposed Revisions of the Fourth Edition of the UL 1277 Standard for Electrical Power and Control Tray Cables with Optional Optical-Fiber Members Summary of Topics: This bulletin presents the disposition of comments received during ANSI canvass of revision
3、s of the American National Standard ANSI/UL 1277. The revisions were proposed in ULs Subject 1277 bulletin dated March 19, 2003. These revisions are being issued to reflect changes in Section 336.10(6) of the 2002 National Electrical Code (NEC), ANSI/UL NFPA 70. COMMENTS DUE: August 21,2003 Attached
4、 in Appendix A is the disposition by UL of the ANSI canvass comments. STP 83 ballots for the revisions were dated March 19, 2003 for return to the STP Secretary by May 20, 2003. Appendix A addresses all of the comments received. If an STP voting member wishes to change a vote in light of the attache
5、d dispositions, the member should respond to UL in writing by August 21, 2003. If we do not hear by this date, the original vote will be maintained. If the STP concurs with the disposition, UL will consider that a consensus has been achieved for including the revisions as part of the American Nation
6、al Standard ANSI/UL 1277. UL expects then to adopt and publish the revisions. You have the right to appeal the disposition actions on a procedural basis. If you wish to appeal, please respond by August 21, 2003. Guidelines on how to register an appeal can be obtained on htttxll ylstandardsinfonet.uI
7、.com. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/16/2006 03:15:31 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 1277 -2- JULY 21, 2003 UL appreciates the time
8、 and effort that you have put forth to review the proposed revisions, and looks forward to your continued participation in future activities regarding the ANSI/UL 1277 Standard. The voting roster in Appendix B shows the names, affiliations, and interests of the STP members. The UL staff members name
9、d or otherwise referenced in Appendix C are available at any time to interpret requirements for Power and Control Tray Cables, QPOR. IMPACT AND EFFECTIVE DATES The following impact and effective date information applies: If the proposed marking revision changing from “open wiring“ to the suffix “-ER
10、 is adopted, manufacturers may make the change to “-ER at any time on or after the date of publication. UL will require the change to “-ER no later than six months after the date of publication. Manufacturers should request a Procedure change from “open Wiring“ to “-ER. No retesting of the cable wil
11、l be required. If the proposed revision is adopted accepting a re-identified circuit conductor as a grounding conductor, beginning on the date of publication, manufacturers may omit a grounding conductor from the “-ER cables described in proposed paragraph 7.7 and in proposed item p of paragraph 29.
12、1. Manufacturers should request a Procedure change to describe the cable construction. UNDERWRITERS LABORATORIES INC. REVIEWED BY: WALTER H. HOFFMANN Secretary of STP 83 Standards Engineer Standards Department Underwriters Laboratories Inc. 1285 Walt Whitman Road Melville NY 11 747-3081 phone: INT+I
13、 631 271 6200 EXT 22564 fax: INT+I 631 439 6021 e-mail: http:/ Working for a safer world . . . STEVEN A. GALAN Chairman of STP 83 Manager -Wire however, where any such part is of metal or other electrically conductive material, its presence shall be indicated by a marking as detailed in 29.1Cj). 9.
14、3 The energy that an optical-fiber cable carries in some laser systems presents a potential risk of eye or other injury to people. Consequently, where optical-fiber cables are installed in a laser system, the recommendations of the ANSI 2136 laser system safety standards should be applied. To help p
15、rotect optical-fiber cable installers, users, service personnel, and anyone who handles the optical-fiber cable component of the system after installation, 29.l(i) specifies a tag, reel, or carton marking. 10 Assembly 10.1 Optical-fiber member(s) and circuit conductors 10.1 .I Optical-fiber member(s
16、) alone shall not constitute a cable. One or more optical-fiber members may be included in a round or flat cable. Optical-fiber members may be grouped with or without electrical conductors. Optical-fiber members in a cable shall be cabled alone or as a group with the same direction and with the same
17、 length of lay as the electrical conductors. In the performance of the cable, each optical-fiber member is to be considered as a filler. A group of optical-fiber members without any electrical conductor(s) in it may include one or more non-current-carrying metal parts (earth-grounded or interrupted
18、when the hybrid cable is installed) such as a metal strength element or a metal vapor barrier. The construction of these parts is not specified. Each such part shall be physically and electrically isolated from any bare grounding conductor in the cable. Copyright Underwriters Laboratories Inc. Provi
19、ded by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/16/2006 03:15:31 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 1277 -Al 1 - MARCH 19,2003 10.1.2 The circuit conductors and insulated grounding conductors shall
20、have the same voltage rating. Insulated conductors with different temperature ratings may be mixed in a given cable if the cable is rated for the lowest temperature rating of any of the constituent insulated conductors. Insulated conductors with wet and dry ratings may be mixed in a given cable if t
21、he cable is rated dry. 10.1.3 Two or more of the insulated conductors indicated in 8.2 and 8.3 shall be assembled in a cable. Sizes may be mixed within the indicated ranges. In a given cable, all of the power conductors shall be of the same metal. Control conductors of 18, 16, and 14 AWG copper may
22、be in a cable with power conductors of aluminum or copper-clad aluminum. Otherwise, all of the control conductors in the cable shall be of the same metal as the power conductors. A cable may contain precabled groups of conductors as described in 10.1.5. 10.1.4 In a cable with two, three, or four cir
23、cuit conductors, the circuit conductors and any insulated (see 7.5) or bare grounding conductor may be cabled (round cable - see 10.1.5 - 10.1.7) or laid parallel (flat cable). As specified in 28.1(s), flat cables with five to eight 18 - 10 AWG insulated conductors are to be marked for use only in s
24、pecific wiring systems. In a flat cable, any insulated (see 7.5) or bare grounding conductor: a) May be a single conductor laid parallel between or beside the two circuit conductors, b) May be divided into two equal parts (see size limits in 7.3) with each such part or section laid in one of the val
25、leys between the circuit conductors, or c) May be evenly distributed helically (concentric) (see size limits in 7.4 and lay length in 10.1.7). 10.1.5 The insulated conductors in a round cable shall be cabled with a length of lay that is uniform throughout the length of the cable and is not greater t
26、han indicated in Table 10.1. Grouping of the circuit conductors into pairs, triads, quads, and other precabled subassemblies is not required but is acceptable if the length of lay of the conductors in each group and of the groups in the overall assembly comply with this paragraph and with Table 10.1
27、. The direction of lay may be changed at intervals throughout the length of the cable. The intervals need not be uniform. In a cable in which the lay is reversed: a) Each area in which the lay is right- or left-hand for not less than five complete twists (full 360“ cycles) shall have the insulated c
28、onductors or precabled groups of insulated conductors cabled with a length of lay that is not greater than indicated in Table 10.1, and b) The length of each lay-transition zone (oscillated section) between these areas of right- and left-hand lay shall not exceed 1.8 times the maximum length of lay
29、indicated in Table 10.1, If the direction of lay is not reversed in a cable containing layers of conductors or groups, the direction of lay of successive layers is not specified but the outer layer shall have a left-hand lay as defined in 10.1.8. If the direction of lay is not reversed in a single-l
30、ayer cable, the conductors or groups shall have a left-hand lay. See 10.2.1 for fillers and 10.3.1 for binders. 10.1.6 If more than one grounding conductor is provided in a round cable (see 7.2 for flat cable), one insulated (see 7.5) or bare grounding conductor in the cable either: a) May be cabled
31、 with the circuit conductors as a single conductor or divided into two or more equal parts (see size limits in 7.3) with each such part or section cabled separately, or Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 N
32、ot for Resale, 10/16/2006 03:15:31 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 1277 -A12- MARCH 19,2003 b) May be evenly distributed helically (concentric - see size limits in 7.4). Every other grounding conductor in a round cable shall not be sectioned or distr
33、ibuted helically. A bare or insulated grounding conductor shall not be laid straight. Table 10.1 Length of lay of insulated conductors and precabled groupsa Number of insulated conductors in cable 2 3 4 5 or more Maximum acceptable length of lay 30 times conductor diameterb 35 times conductor diamet
34、erb 40 times conductor diameterb 15 times the calculated diameter of the overall assembly but, in a multiple-layer cable, the length of lay of the conductors in each of the inner layers of the cable is not specified (governed by the construction of the cabling machine). a The length of lay of each c
35、onductor in a group shall comply with the tabulated value as if the group were a cable. Likewise, the length of lay of each group in a cable shall comply with the tabulated value as if each group was a conductor. “Conductor diameter“ is the calculated diameter of the laraest individual finished insu
36、lated conductor in the cable. 10.1.7 The length of lay of a concentrically distributed, helically applied, bare grounding conductor shall be uniform throughout the length of the cable and shall not be more than 10 or less than 6 times either the calculated diameter over the concentric wires in a rou
37、nd cable or the calculated length of the major axis over the concentric wires in a flat cable. 10.1.8 A left-hand lay is defined as a counterclockwise twist away from the observer. 10.2 Fillers 10.2.1 Fillers shall be provided in a flat or round cable if the fillers are needed to make the finished c
38、able firm at all points. Fillers shall be provided in a cable that is intended to be round if they are needed to make the finished cable round. In a round cable, fillers shall be cabled with the conductors or, if applicable to the construction, may be in the center of the cable. Fillers may be integ
39、ral with or separate from any binder jacket or the overall cable jacket. If fillers are integral with a jacket, they and the jacket shall be readily separable from the underlying cable assembly. Fillers shall be of nonconductive nonmetallic material. Copyright Underwriters Laboratories Inc. Provided
40、 by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/16/2006 03:15:31 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 1277 binder jacket mm O - 10.80 Over 10.80 but not over 17.78 Over 17.78 but not over 38.10 Over 38.1
41、0 but not over 63.50 -A13- Minimum ave mils 15 30 45 60 MARCH 19,2003 24 36 48 10.3 Binders 0.61 0.91 1.22 10.3.1 The entire cable assembly, or any group of conductors (with or without one or more optical-fiber members included in the group), or several such groups within the cable may be enclosed i
42、n a binder consisting of a shield (see 10.4.1- 10.4.3) or of a braid, tape, or other unspecified means. An individual group or several groups may be enclosed in a thin binder jacket that is of the same temperature rating as the overall cable jacket. The thicknesses of a binder jacket (extruded binde
43、r) shall not be less than indicated in Table 10.2 when measured as described in 10.3.2 and 10.3.3. Table 10.2 Thickness of binder jacket Calculated diameter of round assembly under binder jacket or calculated length of major axis of flat assembly und Inch O - 0.425 Over 0.425 but not over 0.700 Over
44、 0.700 but not over 1.500 Over 1.500 but not over 2.500 I ge thickness mm 0.38 0.76 1 .I4 152 Minimum thickness at any point mils I mm 12 0.30 I 10.3.2 The average thickness of the jacket is to be determined by the difference method, which is to consist of determining the average diameter over the f
45、inished jacket, subtracting from it the diameter of the assembly under the jacket, and dividing the result by 2. The diameters over and under the jacket are to be determined by means of a diameter tape capable of making measurements to at least 0.01 inch or 0.1 mm with estimates to 0.005 inch or 0.0
46、5 mm. The average thickness of the jacket is acceptable if the value determined from the diameter-tape measurements equals or exceeds the average indicated in the table. If the average thickness determined from the diameter-tape measurements is less than the average indicated in the table, the jacke
47、t may be removed from the cable and the average thickness determined using the following referee procedure. The thickest (measured at a conductor, not at a filler or elsewhere) and thinnest portions of the jacket are to be located and measured directly with one of the micrometers specified in 10.3.3
48、 (a) and (b). The average of these two micrometer measurements is to be taken as the average thickness of the jacket and is not to be less than the average indicated in the table. 10.3.3 The minimum thickness at any point of the jacket is to be determined by measuring a specimen of the jacket remove
49、d from the finished cable. The specimen is to be cut from the cable with its ends perpendicular to the longitudinal axis of the cable. Measurements are to be made by means of one of the following instruments: a) A machinists micrometer caliper that has a flat surface on the anvil and on the end of the spindle and is calibrated to read directly to at least 0.001 inch o