1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1 Flexible Metal ConduitUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCT
2、ION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Flexible Metal Conduit, UL 1 Eleventh Edition, Dated February 16, 2005 Summary of Topics Reaffirmation and Continuance of the Eleventh Edition of the Standard for Flexible Metal Conduit, UL 1, as an American National Standard.
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8、equirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a futur
9、e effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. JULY 3, 2012 UL 1 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 3, 2012 UL 1 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT
10、 AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 16, 2005 (Title Page Reprinted: July 3, 2012) 1 UL 1 Standard for Flexible Metal Conduit First Edition February, 1924 Second Edition May, 1932 Third Edition July, 1938 Fourth Edition June, 1957 Fifth Edition Nov
11、ember, 1971 Sixth Edition August, 1973 Seventh Edition March, 1979 Eighth Edition August, 1985 Ninth Edition July, 1993 Tenth Edition March, 2000 Eleventh Edition February 16, 2005 This ANSI/UL Standard for Safety consists of the Eleventh Edition, including revisions through July 3, 2012. The most r
12、ecent designation of ANSI/UL 1 as a Reaffirmed American National Standard (ANS) occurred on July 3, 2012. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be
13、 submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs
14、Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2012 UNDERWRITERS LABORATORIES INC. ANSI/UL 1-2007 (R2012)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FR
15、OM UL JULY 3, 2012 FLEXIBLE METAL CONDUIT - UL 1 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 Units of Measurement .4 3 Undated References 4 CONSTRUCTION 4 Strip Material .4 4.1 Ste
16、el 4 4.2 Aluminum 4 5 Thickness of Strip .5 6 Splices 5 7 Convolutions .6 8 Interior Surfaces 6 9 Conduit Diameters 6 PERFORMANCE 10 Zinc Coating 9 11 Tension 11 12 Flexibility 13 13 Impact Tests (RWFMC and XRWFMC) 14 14 Secureness of Conduit in Fittings Tests .15 15 Resistance Test 15 16 Fault-Curr
17、ent Test 16 MARKINGS 17 Details .16 17.1 Maker .16 17.2 Aluminum .17 17.3 Tag .17 17.4 Reduced-wall conduit (RWFMC) .18 17.5 Extra reduced-wall conduit (XRWFMC) .18 FEBRUARY 16, 2005 FLEXIBLE METAL CONDUIT - UL 1 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOU
18、T PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover exible aluminum and steel conduit designed for use as metal raceway for wires and cables in accordance with the National Electrical Code, NFPA 70. 2 Units of Measurement 2.1 Values stated without parentheses are the requirement.
19、Values in parentheses are explanatory or approximate information. 2.2 Unless otherwise indicated, all voltage and current values mentioned in this standard are root-mean-square (rms). 3 Undated References 3.1.1 Any undated reference to a code or standard appearing in the requirements of this standar
20、d shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 4 Strip Material 4.1 Steel 4.1.1 The strip material used in exible steel conduit shall be carbon steel, shall have a tensile strength of at least 34,000 lbf/in 2 (234.5 MPa) and shall be of uniform width
21、 and thickness throughout. All surfaces of the strip shall be free from scale and rust before application of the protective zinc coating specied in Section 10. 4.1.2 Compliance of conduit with the surface-cleanliness requirement in 4.1.1 is to be determined by visual inspection. 4.2 Aluminum 4.2.1 T
22、he strip from which exible aluminum conduit is made shall have: a) A tensile strength of at least 34,000 lbf/in 2 (234.5 MPa) and b) A copper content of 0.40 percent or less. The strip shall be of uniform width and thickness throughout. FEBRUARY 16, 2005 FLEXIBLE METAL CONDUIT - UL 1 4UL COPYRIGHTED
23、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5 Thickness of Strip 5.1 The thickness of the metal strip used for exible metal conduit shall not be less than indicated in Table 5.1 for the specied conduit type. Exception: The thickness of the metal strip
24、 may be less than indicated in Table 5.1 when the conduit complies with the requirements specied for extra reduced-wall exible metal conduit (XRWFMC). Table 5.1 Strip thickness Trade size (Metric designator) Minimum acceptable thickness of strip Standard wall (FMC) Reduced-wall (RWFMC) in (mm) in (m
25、m) 3/8 12 0.034 0.86 0.025 0.64 1/2 16 0.040 1.02 0.025 0.64 3/4 21 0.040 1.02 0.025 0.64 1 27 0.055 1.40 0.030 0.76 1-1/4 35 0.055 1.40 0.030 0.76 1-1/2 41 0.060 1.52 0.030 0.76 2 53 0.060 1.52 0.030 0.76 2-1/2 63 0.060 1.52 0.040 1.02 3 78 0.060 1.52 0.040 1.02 3-1/2 91 0.060 1.52 4 103 0.060 1.52
26、 5.2 Compliance of conduit with the requirement in 5.1 is to be determined by measuring the strip before forming with a at-nose machinists micrometer caliper calibrated to read directly to at least 0.001 inch or 0.01 mm. The thickness of a particular strip is to be determined as the average of ve me
27、asurements. 6 Splices 6.1 Splices in steel and aluminum strip shall be made in a workmanlike manner and shall not materially increase the thickness or diameter of the conduit or lessen its mechanical strength. 6.2 Compliance of conduit with the requirement in 6.1 is to be determined by visual inspec
28、tion. FEBRUARY 16, 2005 FLEXIBLE METAL CONDUIT - UL 1 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Convolutions 7.1 Finished exible steel and aluminum conduit shall have the number of convolutions per foot or the number of convolutions
29、 per 200 millimeters indicated in Table 7.1. Table 7.1 Number of convolutions per unit length Trade size (Metric designator) Number of convolutions per foot Number of convolutions per 200 millimeters 3/8 12 42 47 28 31 1/2 16 30 37 20 24 3/4 21 30 37 20 24 1 2 7 2 03 8 1 32 5 1-1/4 35 20 38 13 25 1-
30、1/2 41 20 27 13 18 2 5 3 2 02 7 1 31 8 8 Interior Surfaces 8.1 The interior surfaces of nished steel and aluminum conduit shall be free from burrs and sharp edges that can damage wiring. 8.2 Compliance of conduit with the requirement in 8.1 is to be determined by visual examination of the interior s
31、urfaces. A specimen of conduit approximately 1 ft (300 mm) in length is to be inspected by looking through it (rst from one end then from the other) at an articial light. 9 Conduit Diameters 9.1 Finished exible steel and aluminum conduit in trade sizes 3/8 4 shall have an external diameter that is n
32、ot smaller than indicated in the second column and not larger than indicated in the third column of Table 9.1 (dimensions in inches) or Table 9.2 (dimensions in millimeters) and shall have an internal diameter that is not smaller than indicated in the fourth column of Table 9.1 (dimensions in inches
33、) or Table 9.2 (dimensions in millimeters). Finished exible steel and aluminum conduit in the 3/8 2 trade sizes shall have an internal diameter that is not larger than indicated in the fth column of Table 9.1 (dimensions in inches) or Table 9.2 (dimensions in millimeters). FEBRUARY 16, 2005 FLEXIBLE
34、 METAL CONDUIT - UL 1 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 9.1 Internal and external diameters in inches Trade size Acceptable external diameters Acceptable internal diameters Minimum Maximum Minimum Maximum 3/8 0.560 0.610
35、 0.375 0.393 1/2 0.860 0.920 0.625 0.645 3/4 1.045 1.105 0.812 0.835 1 1.300 1.380 1.000 1.040 1-1/4 1.550 1.630 1.250 1.300 1-1/2 1.850 1.950 1.500 1.575 2 2.350 2.450 2.000 2.080 2-1/2 2.860 3.060 2.500 3 3.360 3.560 3.000 3-1/2 3.860 4.060 3.500 4 4.360 4.560 4.000 Table 9.2 Internal and external
36、 diameters in millimeters Metric designator Acceptable external diameters Acceptable internal diameters Minimum Maximum Minimum Maximum 12 14.22 15.49 9.52 9.96 16 21.84 23.37 15.88 16.38 21 26.54 28.07 20.62 21.21 27 33.02 35.05 25.40 26.42 35 39.37 41.40 31.75 33.02 41 46.99 49.53 38.10 40.01 53 5
37、9.69 62.23 50.80 52.83 63 72.64 77.72 63.50 78 85.34 90.42 76.20 91 98.04 103.12 88.90 103 110.74 115.82 101.60 9.2 Compliance of the 3/8 2 trade sizes with the minimum and maximum internal diameters in Table 9.1 or 9.2 is to be determined by means of the go and no-go limit gauges specied in Figure
38、9.1 and Table 9.3. Compliance of the 3/8 2 trade sizes with the maximum external diameter in Table 9.1 or 9.2 is to be determined by means of a vernier caliper or its equivalent. Compliance of the 2-1/2 4 trade sizes with the maximum external and minimum internal diameters in Table 9.1 or 9.2 is to
39、be determined by means of a vernier caliper or its equivalent. This is generated text for gtxt. FEBRUARY 16, 2005 FLEXIBLE METAL CONDUIT - UL 1 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 9.3 Diameter of internal diameter limit ga
40、uges Trade size (Metric designator) Diameter D g of GO gauge, Diameter D n of NO-GO gauge, inches a (mm) b inches a (mm) b 3/8 12 0.375 9.52 0.394 10.01 1/2 16 0.624 15.85 0.646 16.41 3/4 21 0.811 20.60 0.836 21.23 1 27 0.999 25.37 1.041 26.44 1-1/4 35 1.249 31.32 1.301 33.05 1-1/2 41 1.499 38.07 1.
41、576 40.03 2 53 1.999 50.77 2.081 52.66 a Tolerances of 0.0005 inch apply to D g and D n . b Tolerances of 0.01 mm apply to D g and D n . Figure 9.1 Hardening tool-steel internal diameter limit gauges The curved surfaces are to be ground and lapped to the diameters indicated in Table 9.3 within the t
42、olerances indicated in the notes to Table 9.3. The handles for these gauges are not specied, nor is the means by which the handles are joined to the gauges. The length L of each gauge is to be at least equal to two full convolutions of the trade size of conduit to which the gauge applies. Each gauge
43、 is to have the designation GO or NO-GO on the same face on which the size appears. FEBRUARY 16, 2005 FLEXIBLE METAL CONDUIT - UL 1 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 10 Zinc Coating 10.1 The zinc coating on steel c
44、onduit shall meet all of the following requirements: a) A specimen of the zinc-coated strip tested before forming shall not show a bright, adherent deposit of copper on any surface, including edges, after two 60-second immersions in a solution of copper sulphate. b) A specimen of partially uncoiled
45、conduit from nished conduit: 1) Shall not show a bright, adherent deposit of copper after one 60-second immersion in a copper sulphate solution, and 2) Shall not show a bright, adherent deposit of copper on more than 25 percent of any surface, including edges, after two 60-second immersions in a cop
46、per sulphate solution. 10.2 The copper sulphate solution is to be made from distilled water and the American Chemical Society (ACS) reagent grade of cupric sulphate (CuSO 4 ). In a copper container or in a glass, polyethylene, or other chemically nonreactive container in which a bright piece of copp
47、er is present, a quantity of the cupric sulphate is to be dissolved in hot distilled water to obtain a solution that has a specic gravity slightly higher than 1.186 after the solution is cooled to a temperature of 18.3C (65.0F). Any free acid that might be present is to be neutralized by the additio
48、n of approximately 1 gram of cupric oxide (CuO) or 1 gram of cupric hydroxide Cu(OH) 2 per liter of solution. The solution is to be diluted with distilled water to obtain a specic gravity of exactly 1.186 at a temperature of 18.3C (65.0F). The solution is then to be ltered. 10.3 At one end of a samp
49、le length of nished steel conduit, the conduit is to be unwound from the outside to expose both edges and the inner surface of the formed strip and to facilitate working cheesecloth between the turns onto the inner surface to dry that surface during the test. To reduce the damage to the zinc coating, the strip is not to be straightened as it is unwound but is to remain in the helical form with a diameter no larger
