1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMAY 5, 20171UL 504Outline of Investigation for Mineral-Insulated, Metal-Sheathed CableIssue Number: 1May 5, 2017Summary of TopicsThis first issue of the Outline of Investigation for Mineral-Insul
2、ated,Metal-Sheathed Cable, UL 504.ULs Outlines of Investigation are copyrighted by UL LLC. Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Inves
3、tigation shall remain the sole and exclusive property of ULLLC.COPYRIGHT 2017 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMAY 5, 2017UL 5042No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIB
4、UTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Units of Measurement .43 Undated References 4CONSTRUCTION4 Materials .45 Conductors .56 Insulation 57 Metal Sheath .58 Overall Nonmetallic Covering .68.1 Material .68.2 Properties .78.3 Thicknesses .79 Assembly 8PERFORMANCE10 Continuity
5、 Test of Conductors .811 Dielectric Strength Test .812 Insulation Resistance .813 DC Resistance of Conductors .914 Flexibility Test .915 Test for Durability of Ink Printing 1016 Cable Flame Test (Required for Cables with a Nonmetallic Covering) .1017 Deformation Test (Required for Cables with an Ove
6、rall Nonmetallic Covering of Thermoplastic orXL)1018 Cold-Bend Test (Required for Cables with a Nonmetallic Covering) .1019 Vertical-Tray Flame Test (Optional for Cables with a Nonmetallic Covering) .1120 FT4 Test (Optional for Cables with a Nonmetallic Covering) .1121 Sunlight-Resistance Test (Opti
7、onal for Cables with a Nonmetallic Covering, Required for Cableswith a Nonmetallic Sheath Suitable for Use Outdoors) .1122 Crushing Test (Optional for Cables with a Nonmetallic Covering) .1123 Oil Resistance (Optional for Cables with a Nonmetallic Covering) .1124 Gasoline Resistance (Optional for Ca
8、bles with a Nonmetallic Covering) .12MARKINGS25 Information on the Cable 1226 Information on the Tag, Reel, or Carton .13MAY 5, 2017 UL 504 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 This Outline of Investigation c
9、overs mineral-insulated (Type MI) metal-sheathed cable, which consistsof one or more solid copper conductors insulated with highly compressed magnesium oxide and enclosedin a continuous copper or alloy steel sheath, with or without a nonmetallic jacket.1.2 Cables rated 600 V may be composed of 16 AW
10、G to 500 kcmil single conductor, 16 to 4 AWG twoand three conductor, 16 to 6 AWG four conductor, and 16 to 10 AWG seven conductor constructions.Cables rated 300 V may be composed of two, three, four and seven conductor, sizes 18 to 16 AWG, foruse on signaling circuits.1.3 The copper sheath is suitab
11、le as an equipment grounding conductor. For cable with alloy steel outersheath one of the insulated conductors is to be used for equipment grounding.1.4 The cable shall be installed in accordance with Article 332 of National Electrical Code, NFPA 702 Units of Measurement2.1 The unit of measure shall
12、 be SI. If a value for measurement is followed by a value in other units inparentheses, the second value represents a direct conversion or an alternative value.3 Undated References3.1 Any undated reference to a code or standard appearing in the requirements of this Outline shall beinterpreted as ref
13、erring to the latest edition of that code or standard.3.2 Wherever the designation UL 1581 is used in this cable Outline, reference is to be made to thedesignated part(s) of the Reference Standard for Electrical Wires, Cables, and Flexible Cords, UL 1581.Whenever the designation UL 2556 is used in t
14、his standard, reference is to be made to the designatedparts of the Wire and Cable Test Methods, UL 2556.CONSTRUCTION4 Materials4.1 Only materials that are acceptable for the particular use shall be employed in a cable.4.2 Each material used in a cable shall be compatible with all of the other mater
15、ials used in the cable.MAY 5, 2017UL 5044UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5 Conductors5.1 Conductors shall be uncoated copper, nickel or nickel clad copper.5.2 Uncoated copper conductors shall comply with the requirements of Sta
16、ndard Specification for Soft orAnnealed Copper Wire, ASTM B3.5.3 Nickel-clad copper conductors shall comply with the requirements of Standard Specification forNickel-Coated Soft or Annealed Copper Wire, ASTM B355.5.4 Nickel conductors shall comply with the requirements of Standard Specification for
17、Nickel Rod andBar, ASTM B1606 Insulation6.1 The insulation shall consist of highly compressed, powdered magnesium oxide.6.2 The minimum insulation thickness between conductors and between conductors and sheath(s) shallbe 0.055 inches.6.3 Compliance with 6.2 shall be determined in accordance with the
18、 method described in 6.3.1 6.3.4.6.3.1 The end of one specimen shall be filed smooth. The end of the specimen shall be fliedperpendicular to the length of the specimen (right-circular cylinder).6.3.2 The mineral insulation shall be carefully removed from the filed end of the specimen to a depth ofat
19、 least 0.01 inches without disturbing the position of the conductors within the cable.6.3.3 A steel gauge shall be inserted between adjacent conductors and between the conductors and thesheath.6.3.4 A steel gauge of 0.054 inches shall pass between adjacent conductors and between the conductorsand th
20、e sheath without disturbing the position of the conductors.7 Metal Sheath7.1 The sheath shall consist of annealed copper or alloyed steel.7.2 The thickness of the sheath shall not be less than the values shown in Table 7.1.MAY 5, 2017 UL 504 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPROD
21、UCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 7.1Thickness of sheathSize of conductor,AWG or kcmilMinimum thickness at any point, milsNumber of conductors12347-1418 19 27 28 28 3116 19 27 28 28 3114 19 27 28 28 3112 19 27 28 28 3110 19 27 28 28 318 20272830366 2303134 4 43436 3 2638382 71 8/
22、022 3034/05250 37 350 39 500 41 7.3 Compliance with the requirements in Table 7.1 shall be determined in accordance with the methodThickness, described in UL 2556.7.4 Joints are permitted in the sheath as long as the thickness requirements and integrity of the mineralinsulation and sheath are mainta
23、ined.8 Overall Nonmetallic Covering8.1 Material8.1.1 An overall nonmetallic covering over the sheath is optional. When applied, the covering shall beeither thermoplastic or thermoset.MAY 5, 2017UL 5046UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION F
24、ROM UL8.2 Properties8.2.1 Specimens prepared from samples of the overall covering taken from the finished cable shall exhibitphysical properties that comply with the requirements in Table 8.1 when tested as indicated in this section.8.2.2 Compliance shall be determined in accordance with the test, P
25、hysical properties (ultimateelongation and tensile strength), in UL 2556.Table 8.1Physical properties of covering over metallic sheathMaterials(s) Temperature rating of jacket Applicable table of physical propertiesin UL 1581CP 90C (194F) 50.175C (167F) 50.1Thermoplastic CPE 90C (194F) 50.28Thermose
26、t CPE 90C (194F) 50.2975C (167F) 50.30ECTFE, ETFE 150C (302F) 50.63NBR/PVC 90C (194F) 50.8375C (167F) 50.80Neoprene 90C (194F) 50.12475C (167F) 50.123PVC 90C (194F) 50.18275C (167F) 50.182LDFRPE, HDFRPE 75C (167F) 50.133TPE 90C (194F) 50.224XL 90C (194F) 50.23175C (167F) 50.2318.3 Thicknesses8.3.1 T
27、he covering shall be a minimum thickness at any point of 0.030 inches on cables less than 0.5inches, and 0.040 inches on cables equal to or greater than 0.5 inches in diameter under the covering.8.3.2 Thickness of the covering shall be determined in accordance with the method Thickness asdescribed i
28、n UL 2556.MAY 5, 2017 UL 504 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9 Assembly9.1 Cables may consist of:a) Single insulated conductor with overall sheath.b) Multiple insulated conductors with overall sheath.9.2 All constructions may
29、have an overall covering meeting the requirements of Overall NonmetallicCovering, Section 8.PERFORMANCE10 Continuity Test of Conductors10.1 All of the conductors in the finished cable shall be continuous throughout the entire length of thecable.10.2 Compliance with 10.1 shall be determined in accord
30、ance with the method Continuity, as describedin UL 2556.11 Dielectric Strength Test11.1 The finished cable shall withstand for 1 minute, without breakdown, a dielectric voltage of 1600V for300V rated cables, or 2200 V for 600V rated cables. The voltage shall be applied for 5 minutes.11.2 The test vo
31、ltage shall be applied between conductors and between the conductors an the metallicsheath.11.3 Compliance shall be in accordance with the test, Dielectric voltage-withstand, Method 2 (in air) in UL2556.12 Insulation Resistance12.1 Immediately after the Dielectric Strength Test, Section 11, and usin
32、g the same samples, the cableshall have an insulation resistance of not less than 5000 M 1000 ft. for sizes 18 4 AWG and 3500M 1000 ft. for sizes 3 AWG 500 kcmil. The insulation resistance shall be measured between theconductor and the sheath. In the case of multiple conductor constructions, the ins
33、ulation resistance shallbe measured between one conductor and all other conductors and the sheath tied together.12.2 Compliance shall be determined in accordance with the test Short-term insulation resistance,Method 2 (15C in air), as described in UL 2556.MAY 5, 2017UL 5048UL COPYRIGHTED MATERIAL NO
34、T AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL13 DC Resistance of Conductors13.1 The DC resistance of the conductors shall not be greater than the values indicated in Table 13.1.Table 13.1DC resistance at 25CSize of conductor, AWG or kcmil Maximum DC resistance of co
35、nductors, /1000 ft at 25CBare copper, nickel-clad copper Nickel18 7.04 43.7516 4.24 27.3114 2.73 16.9612 1.72 6.7610 1.08 4.238 0.68 2.666 0.43 1.684 0.27 1.233 0.21 0.7720.171031/0 0.11 2/0 0.084 3/0 0.067 4/0 0.052 250 0.044 350 0.032 500 0.022 13.2 Compliance with 13.1 shall be determined in acco
36、rdance with the method DC resistance asdescribed in UL 2556.14 Flexibility Test14.1 The cable shall withstand a dielectric potential as indicated in DC Resistance of Conductors, Section13 for one minute when subjected to the procedure described in 14.2 14.3.14.2 A specimen of finished cable 0.75 inc
37、hes in diameter or less shall be bent in a U-bend around amandrel having a diameter five times that of the overall cable. For cables larger than 0.75 inches, thecable shall be bent in a U-bend around a mandrel ten times the diameter of the cable. With the cable stillin the bent position, a potential
38、 shall be applied between the conductors and between the conductors andthe sheath(s).14.3 Compliance shall be in accordance with the test, Dielectric voltage-withstand, Method 2 (in air) in UL2556.MAY 5, 2017 UL 504 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITH
39、OUT PERMISSION FROM UL15 Test for Durability of Ink Printing15.1 Surface-printed markers shall be complete and legible after two samples have been tested inaccordance with the test, Durability of ink printing, in UL 2556.15.2 For surface print on the metallic sheath, one sample shall be conditioned
40、at 121C for 168 hours.15.3 For surface print on the nonmetallic covering, one specimen shall be conditioned for the same timeand temperature as for the covering material. See Table 8.1.16 Cable Flame Test (Required for Cables with a Nonmetallic Covering)16.1 A vertical specimen of finished cable hav
41、ing an overall nonmetallic covering shall comply with theCable Flame Test, Section 1061 in UL 1581.17 Deformation Test (Required for Cables with an Overall Nonmetallic Covering ofThermoplastic or XL)17.1 Specimens of a thermoplastic or XL overall covering taken from the finished cable shall not decr
42、easemore in thickness than the percentage indicated for the covering material in Table 17.1 while tested at thetemperature and under the load indicated in Table 17.1. The test is to be made in accordance with theDeformation test in UL 2556.Table 17.1Load and decrease in thickness for deformation tes
43、tJacket material Maximum acceptabledecrease in thicknessin percentTest temperature, C(F)Load exerted on specimen by presser footgf (N)Thermoplastic CPE 25 121.0 1.0 (249.8 1.8) 2000 (19.61)PVC 50 121.0 1.0 (249.8 1.8) 2000 (19.61)XL 15 121.0 1.0 (249.8 1.8) 2000 (19.61)LDFRPE and HDFRPE 50 100.0 1.0
44、 (212.0 1.8) 2000 (19.61)TPE 50 150.0 1.0 (302.0 1.8) 2000 (19.61)18 Cold-Bend Test (Required for Cables with a Nonmetallic Covering)18.1 While at a temperature of minus 25.0 2.0C (minus 13.0 3.6F), finished cable shall be capable ofbeing wound around a right-circular mandrel having a diameter equal
45、 to 14 times the diameter measuredover the outside of the finished cable, without damage to the any covering over the metallic sheath.18.2 Compliance with Table 18.1 is to be determined in accordance with the method Cold bend, asdescribed in UL 2556.MAY 5, 2017UL 50410UL COPYRIGHTED MATERIAL NOT AUT
46、HORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL19 Vertical-Tray Flame Test (Optional for Cables with a Nonmetallic Covering)19.1 The overall, nonmetallic sheath on finished cable marked For CT use,orFor Cable-tray use shallcomply with the Vertical tray flame tests (Method
47、1 Vertical tray and Method 2 FT4) as described inUL 2556.20 FT4 Test (Optional for Cables with a Nonmetallic Covering)20.1 The overall, nonmetallic sheath on finished cable marked FT4 shall comply with the Vertical trayflame tests (Method 1 Vertical tray and Method 2 FT4) as described in UL 2556.21
48、Sunlight-Resistance Test (Optional for Cables with a Nonmetallic Covering, Required forCables with a Nonmetallic Sheath Suitable for Use Outdoors)21.1 Finished cable whose overall nonmetallic covering is marked to indicate that the cable is suitable foruse in sunlight is to be considered acceptable
49、for sunlight-resistant use if after conditioning for 720 hoursin a xenon arc weatherometer as described in the test, Weather (sunlight) resistance, in UL 2556, thejacket retains an average tensile strength and elongation of not less than 80 percent. Conditioned andunaged sets (five specimens each) shall be allowed to rest 16 hours to 96 hours at room temperature,followed by physical properties testing.22 Crushing Test (Optional for Cables with a Nonmetallic C
