1、ANSljlCEA S-76-4 7 4-2011 I -I I (j) II . ,.I STANDARD FOR NEUTRAL-SUPPORTED POWER CABLE ASSEMBLIES WITH WEATHER-RESISTANT EXTRUDED INSULATION RATED 600 VOLTS Approved by AMERICAN NATIONAL STANDARDS INSTITUTE July 15, 2011 Publication # ANSI/ICEA S-76-474-2011 I I I I I I I I I I I I I I 2011 by I I
2、I INSULATED CABLE ENGINEERS ASSOCIATION, Inc. I II I II I II I II I II I II I II I II I I I I I I I I Approved as an American National Standard ANS! Approval Date: July 16. 2011 ANSI/ICEA Publication S-76-474 - 2011 Standard For Neutral-Supported Power Cable Assemblies With Weather-Resistant Extrude
3、d Insulation Rated 600 Volts Developed and Published By Insulated Cable Engineers Association, Inc. Post Office Box 1568 1“ _ . 11+,. “ .,i. “ln1-t., I 1. 5-76-474-2011 Pageiv ICEA publications are adopted in the public intai6st and SiG designed to eliminate misunderstanding between the manufacturer
4、 and user and to assist the user in selecting and obtaining proper products for his particular need El(istenc.e of an !CE.I. pubHc.!tion does not in any respect preclude the manufacture or use of products not conforming to the publication. The user of this publication is cautioned to observe any app
5、licable heaHh or safety regulations and rules relative to the manufacture and use of cable made in conformity with this publication. This publication hereafter assumes that manufacture, testing, installation and maintenance of cables defined by this publication will be performed only by properly tra
6、ined personnel using suitable equipment. Questions of interpretation of !CE.I. publications can only be accepted in writing at Headquarters by the Secretary, and the reply shall be provided in writing. Suggestions for improvements in this publication are welcome, and should be sent to ICEA at the ad
7、dress below. Copyrighted by the ICEA Contents may not be reproduced in any form without permission of the INSULATED CABLE ENGINEERS ASSOCIATION, INC. Post Office Box 1568 Carrollton, Georgia 30112, USA Telephone: (770) 830-0369 2011 by the Insulated Cable Engineers Association, Incorporated Section
8、1 GENERAL 1.1 SCOPE ICEA S-76-474-2011 Page 1 This staiidaid applies to the matenals, constructions, and tasting of assemblies of extruded dielectric insulated electric current carrying phase conductors and bare or covered neutral electrical conductors used as weather-resistant wires and cables susp
9、ended from supporting structures for the overhead distribution of electrical energy. This standard is intended to apply to the following multiplexed wire and cable constructions: Neutrai Supported Service Drop Cabies, ami Neutral Supported Secondari Cistrib;1ion Cables. The use of these service drop
10、 and secondary distribution cables is limited to Circuits not exceeding 600 volts phase-to-phase. or 480 volts phase-to-ground. and to a normal service conductor temperature rating of 75C or goc. When reference is made in this publication to an industry standard. that reference is to the standard wi
11、th . _ .t.il.I _ .1_JAIOlIl03 UV“UfCCIl LlIIW 1 . “Iun IIIQI“ “I LlII,wo standard and those of a referenced standard, the requirements of this standard shall apply. In this standard, units are most often expressed in the English System. To convert from an English unit to the appropriate metric unit,
12、 multiply the value of the English unit by the appropriate number from Appendix B. The recommended bending radii for phase conductors and cable assemblies is given in Appendix C. U.S. customary units, except for temperature, are specified throughout this standard. Approximate International System of
13、 Units (SI) equivalents are included for information only. 1.2 ASSEMBLIES Multiplexed cable assemblies are composed of one or more phase conductors assembled with a neutral conductor. The neiJ“tral conductor may be bare Oi covered with an extruded Weather-resistant loo-v/linaar 10:; UI lilt: UIIIUt:
14、1 t,;UVt:IIIIY, WIlt:1I U:it:U, 0)1IC111 LIt: lIIt:ts:tUICU III cn . AJIUClIllil: WIlli IvlJ“ T-27-581INEMA WC 53. The minimum thickness at any point of the covering shall not be less than the app!ic.ab!e va!ue in Tab!e 31. 2011 by the Insulated Cable Engineers Association. Incorporated 3.4 SEPARATO
15、R Table 3 1 MINIMUM THICKNESS OF THE BINDER COVERING Binder Size AWG 10 Thickness. mils(mm) LOPE I LLOPE I MOPE 27 (0.69) HOPE 14 (0.36) ICEA 5-76-474-2011 Page 13 A separator may be used between a solid or stranded conductor and the insulation or covering. If a separator is used. it shall be opaque
16、 or colored. A clear separator is not permitted. 3.5 ELECTRICAL REQUIREMENTS 3.5.1 Voltage Tests When tested in accordance with ICEA T-27-581INEMA WC 53. each phase conductor of each manufacturing or finished length shall successfully withstand either of the following tests: 3.5.1.1 After the cable
17、is immersed in water for 30 minutes. an ac voltage of 3000 volts shaii be applied for one minute between the phase conductor(s) and the water. 3.5.1.2 A spark test of 8.5 kV ac or 13.0 kV de voltage shall be applied. The test shall be c.onducted on the finished assembly of conductors with the neutra
18、l isolated from the applied voltage. Where an assembly is subject to the direct current spark test. the individual phase conductors shall be similarly tested prior to assembly. 3.6 INSULATION OR NEUTRAL COVERiNG REQUiREMENTS 3.6.1 Thickness Requirements 3.6.1.1 Insulation Thickness When measured in
19、accordance with ICEA T-27-581/NEMA WC 53. the minimum thickness at any point of the insulation shall not be less than the applicable value in Table 3-2. 3.6.1.2 Neutral Covering Thickness ,AJhsn measured in accordance with !CE.-A T-27-581!NE.A.,.t AJC 53. the minimum thickness at any point of the ne
20、utral covering shall not be less than the applicable value in Table 3-3. 3.6.2 Physical Requirements 3.6.2.1 Insulation Physical Requirements The insulation shall meet the requirements in Table 3-4. 2011 by the Insulated Cable Engineers Association. Incorporated ICEA 5-76-474-2011 Page 14 3.6.2.2 Ne
21、utral Covering Physical Requirements The neutral covering shall meet the requirements in Table 3-4. Conductor Size AWGorkcmii 8-2 1 - 4/0 250 - 477 Table 3-2 MINIMUM THICKNESS OF INSULATION Minimum Thickness Mils (mm) 41 (1.0) 54 (1.4) 72 (1.8) Nominal Thickness Miis(mmi 45 (1.1) 60 (1.5) 80 (2.0) T
22、he nominal insulation thicknesses are not requirements. They are included for information purposes only. iabie 3-3 MINIMUM THICKNESS OF NEUTRAL COVERING Conductor Size AWGorkcmil Minimum Thickness Mils (mm) Nominal * Thickness Mils (mm) 8 - 4 27 (0.69) 30 (0.76) 2-1 41(1.0) I 45(1.1) 35-7 ! g : ! g
23、:l The nominal insulation thicknesses are not requirements. They are included for information purposes on!y. 2011 by the Insulated Cable Engineers Association, Incorporated Property Density (gm/cm1 t Initial Tensile, min. psi. (MPa) Initial Elongation at Rupture, Minimum, perc-ent (See 6.1) After Ag
24、ing in air oven, Hours Temperature, C 1C Tensile Strength and Elongation at rupture: OL ,f I InClI“IM /aliIA IV l:f . . (See 6.1) Heat Distortion Temperature, C 1C Maximum percentage of Originai thickness (a) 266.8 kcmil and smaller (b) Larger than 266.8 kcmil (See 6.2) Hot Creep Temperature, C 2C E
25、longation, Maximum percent Filled Unfilled Set, maximum percent Fi!ed * Unfilled (See 6.3) Absorption Coefficient minimum (1000 Absorbance/Meter) (See 6.4) INSULATION PHYSICAL REQUIREMENTS 7O“ w _ Polyethylene Low/ Linear Medium High Low DenSity Density Density Type I Type II Type III 0.9iO-O.925 0.
26、925-0.940 0.940-0.960 1700 (11.7) 2300 (15.9) 2500 (17.3) 350 350 350 48 48 48 ;00 iDO iOO 75 75 75 100 110 110 30 30 30 10 10 10 ICEA 5-76-474-2011 Page 15 90C Crosslinked Polyethylene 0.910-0.960 1800 (12.4) 250 168 i2i 75 150 100 175 5 10 A filled cross-linked polyethylene insulation is one which
27、 contains 10 percent or more of carbon black and/or mineral fillers by weight. An unfilled c.fO-s-s!inked polyethylene insulation is one which contains less than 10 percent of carbon black and/or mineral fillers by weight. - In lieu of testing insulation removed from the conductor, a certification b
28、y the manufacturer of the polyethylene compound that this requirement has been complied with shall suffice. t The density ranges are applicable to the uncolored, unfilled primary poiyethyiene component of the insuiation. 2011 by the Insulated Cable Engineers AssOCiation, Incorporated ICEA S-76-474-2
29、011 Page 15 Section 4 CABLE ASSEMBLIES AND IDENTIFICATION 4.1 CABLE ASSEMBLIES 4.;. ; Twisted Assembiies One or more phase conductors shall be t. of the phaSe conductors of a triplex or quadruplex assembly, may be durably and legibly marked throughout its length. The legend, if used, shalt be repeat
30、ed at a maximum interval of 1 meter. When ink sufface printing is used, the legend shall be printed in a contrasting color. 2011 by the Insulated Cable Engineers Association, Incorporated Section 5 ICEA 5-76-474-2011 Page 17 PERFORMANCE REQUIREMENTS FOR FINISHED CABLES 5.0 GENERAL Requirements for f
31、inished cables are in addition to the component requirement in Part 2. Finished cable tests may be made either on a production length before cutting into finished lengths, or on the cut finished iengths. Some finished cabie tesis may be made on sampies cut from ends of production or finished iengths
32、. 5.1 STRENGTH OF NEUTRAL CONDUCTORS For bare neutral conductors, the rated strength shall be as determined in accordance with the applicable referenced stranded or solid bare conductor speCification given in Section 2.3. For covered neutral (1) aluminum conductor, coated-steei reinforced (ACSR), (2
33、) aiuminum conductor, aiuminum-ciad sieei reinforced (ACSRiAiiv,), (3) hard drawn copper, and (4) copper and copper-ciad sieei composita conductoiS, the rated strength shall be 5% less than tha rated strength as datciiiiinad from tha applicable referenced bare conductor specification. For covered ne
34、utral (1) aluminum and (2) aluminum alloy 6201-T81 conductors, the rated strength shall be 10% less than the rated strength as determined from the applicable referenced bare conductor specification. 5.2 COMPLETED ASSEMBLY NEUTRAL CONDUCTOR STRENGTH TESTS Tests for demonstration of the rated strength
35、 of a neutral conductor from a completed assembly are not required by this standard but may be made if agreed upon between the manufacturer and the purchaser at the time of placing the order. If tested, the breaking strength of a neutral conductor shall not be less than the rated strength if the fai
36、lure occurs in the free length at least one inch beyond the end of either gripping device, or shall not be less than 95% of the rated strength if failure occurs inside, or within one inch of the end of, either gripping device. 5.3 iViAXiMUivi PHASE CONDUCiOR DC RESiSiANCE FER UNii LENGiH The de resi
37、stance per unit length of each phase conductor in a production or finished length shall be determined in accordance with either 5.3.1 (measurement) or 5.3.2 (calculation). When the resistance is determined on a sample taken from an assembly or on individual phase conductors in a completed parallel a
38、ssembly, the maximum resistance shall not exceed 102% of the appropriate reSistance value in Table 2-3. AJhen the resistance is determined on individual phase conductors in completed twisted aSSemblieS, the maximum resistance shall not exceed 104% of the appropriate resistance value in Table 2-3. 5.
39、3.1 Direct Measurement of Phase Conductor dc Resistance Per Unit Length The phase conductor de resistance per unit length shall be determined in accordance with ICEA T-27-581/NEMA WC 53 to an accuracy of 2 percent or better. If measurements are made at a temperature other than 2S“C, the measured vai
40、ue shaii be corrected to 2S“C. 2011 by the Insulated Cable Engineers ASSOCiation, Incorporated ICEA S-78-474-2011 Page 18 If u.c.rifiO!lI+inn ie roll ir.c.rI fnr hO!llr.c. nnrl I“Inr rlir.c.I“I rr.c.n+ r“ICIoriclan.c. ITIOaC!llrlClllTIlCllnte: mario nn .an ICIIntirD “ “ , .oY . “ I . ,iI.oY . . L .
41、, L ,L “.“L . n “ . , , . length of a completed assembly, a sample at least one foot long (0.305 m) shall be cut from the reel length, and the direct-current resistance of each phase conductor shall be measured using a Kelvin-type bridge or a potentiometer. 5.3.2 Calculation of Phase Conductor dc Re
42、sistance Per Unit Length The phase conductor dc resistance per unit length at 25C shall be calculated using the formula: Where: R = Conductor resistance in nil 000 ft. R=k A k = Weight increment factor (1.00 for solid conductors and 1.02 for stranded c-Onductors). p = Volume resistivity, Qcmil/ft. A
43、 = Cross-sectional area of conductor in kcmil. The volume resistivity (P) of the conductor material shall be determined in accordance with ASTM B193 using round wires. The cross-sectional area of round solid conductors and round concentric stranded conductors, except compact and compressed stranded,
44、 shaii be deiermined in accordance with the latest edition of ICEA T-27-581/NEMA WC 53, or in accordance with ASTM B263. The cross-sectional area of compressed stranded and compact stranded conductors shall be determined in ac-c-Oroanc-e with ASTM B263. 2011 by the Insulated Cable Engineers Associat
45、ion, Incorporated Section 6 TEST METHODS FOR INSULATION OR COVERING ICEA S-76-474-2011 Page 19 6.1 METHODS FOR MEASURING INSULATION PHYSICAL AND AIR OVEN AGING PROPERTIES When tested in accordance with ICEA T27-581, the insulation tensile strength and elongation at rupture and retention of tensile s
46、trength and elongation at rupture after air oven aging shall meet the applicable requirements in Table 3-4 for crosslinked and thermoplastic materials. 6.2 METHOD FOR MEASURING INSULATION HEAT DEFORMATION (DISTORTION) The method for measuring the Heat Deformation (Distortion) of the insulation requi
47、red in Table 3-4 for thermoplastic materials shall be in accordance with ICEA T-27-581/NEMA WC 53. 6.3 METHOD FOR MEASURING INSULATION HOT CREEP The method for measuring the Hot Creep of the insulation required in Table 3-4 for crosslinked matertals shall be in accordance with ICEA T -28-562. 6.4 ME
48、THOD FOR MEASURING ABSORPTION COEFFICIENT The absorption coefficient of biack 75“C insuiation materiai shaii be determined in accordance with ASTM 03349. 2011 by the Insulated Cable Engineers Association, Incorporated ICEA S-76-474-2011 Page 20 Section 7 QUALIFICATION TESTS 7.0 GENERAL Qualification
49、 tests included in this standaid Sie intended to demonstrate the capability of the manufacturer to fum ish high quality cable with the desired performance characteristics. Although these tests are not routinely performed, it is intended that the product furnished under this standard shal! consistently comply wHh all of the qualification test requirements. 7.1 METHOD FOR DETERMINING RESISTANCE TO ENVIRONMENTAL STRESS CRACKI
