1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1 Flexible Metal Conduit STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED F
2、OR FURTHER REPRODUCTION 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 This revision was issued to incorporate the following changes. 1. Eliminate Minimum Strip Thickness for RWFMC and Rem
3、oval of XRWFMC The revised requirements are substantially in accordance with Proposal(s) on this subject dated May 12, 2017. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. All rights reserved. No part of this pub
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8、ystem. AUGUST 17, 2017 UL 1 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 17, 2017 UL 1 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 1
9、6, 2005 (Title Page Reprinted: August 17, 2017) 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 November, 1971 Sixth Edition August, 1973 Seventh Edition March, 1979 Eighth Edition Augus
10、t, 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 August 17, 2017. The most recent designation of ANSI/UL 1 as an American National Standard (ANSI) occurred on Au
11、gust 17, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standa
12、rds Development System (CSDS) at https:/. 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 Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive pr
13、operty of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 1-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 17, 2017 FLEXIBLE METAL CONDUIT - UL 1 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
14、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 Steel 4 4.2 Aluminum 4 5 Thickness of Strip .5 6 Splices 5 7 Convolutions .6 8 Interior Surfaces 6 9 Conduit Diameters 6 PERF
15、ORMANCE 10 Zinc Coating 9 11 Tension 11 12 Flexibility 13 13 Impact Tests (RWFMC) .14 14 Secureness of Conduit in Fittings Tests .15 15 Resistance Test 15 16 Fault-Current 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 r
16、educed-wall conduit (XRWFMC) .18 AUGUST 17, 2017 FLEXIBLE METAL CONDUIT - UL 1 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover exible aluminum and steel conduit designed for use as metal rac
17、eway 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. Values in parentheses are explanatory or approximate information. 2.2 Unless otherwise indicated, all voltage and current values menti
18、oned 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 standard 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
19、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 and thickness throughout. All surfaces of the strip shall be free from scale and rust before application of the protective zinc coati
20、ng 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 The 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
21、 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 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5 Thickness of Strip 5.1 The thickness of
22、 the metal strip used for exible metal conduit shall not be less than indicated in Table 5.1 for standard wall exible metal conduit (FMC). Exception: The thickness of the metal strip may be less than indicated in Table 5.1 when the conduit complies with the requirements specied for reduced-wall exib
23、le metal conduit (RWFMC). Table 5.1 Strip thickness Trade size (Metric designator) Minimum acceptable thickness of strip Standard wall (FMC) in (mm) 3/8 12 0.034 0.86 1/2 16 0.040 1.02 3/4 21 0.040 1.02 1 27 0.055 1.40 1-1/4 35 0.055 1.40 1-1/2 41 0.060 1.52 2 53 0.060 1.52 2-1/2 63 0.060 1.52 3 78
24、0.060 1.52 3-1/2 91 0.060 1.52 4 103 0.060 1.52 5.2 Compliance 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 b
25、e determined as the average of ve measurements. 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
26、is to be determined by visual inspection. AUGUST 17, 2017 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
27、foot or the number of convolutions 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 1 2 4 24 7 2 83 1 1 / 2 1 6 3 03 7 2 02 4 3 / 4 2 1 3 03 7 2
28、 02 4 1 2 7 2 03 8 1 32 5 1 - 1 / 4 3 5 2 03 8 1 32 5 1 - 1 / 2 4 1 2 02 7 1 31 8 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
29、8.1 is to be determined by visual examination of the interior surfaces. 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
30、 in trade sizes 3/8 4 shall have an external diameter that is not 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 in
31、dicated in the fourth column of Table 9.1 (dimensions in inches) 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 Ta
32、ble 9.2 (dimensions in millimeters). FEBRUARY 16, 2005 FLEXIBLE 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 int
33、ernal diameters Minimum Maximum Minimum Maximum 3/8 0.560 0.610 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
34、4.060 3.500 4 4.360 4.560 4.000 Table 9.2 Internal and external 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 2
35、6.42 35 39.37 41.40 31.75 33.02 41 46.99 49.53 38.10 40.01 53 59.69 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 determin
36、ed by means of the go and no-go limit gauges specied in Figure 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 ext
37、ernal and minimum internal diameters in Table 9.1 or 9.2 is to 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 PERM
38、ISSION FROM UL Table 9.3 Diameter of internal diameter limit gauges 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
39、 26.44 1-1/4 35 1.249 31.32 1.301 33.05 1-1/2 41 1.499 38.07 1.576 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
40、and lapped to the diameters indicated in Table 9.3 within the tolerances 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 t
41、he trade size of conduit to which the gauge applies. Each gauge 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
42、UL PERFORMANCE 10 Zinc Coating 10.1 The zinc coating on steel conduit 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 so
43、lution of copper sulphate. b) A specimen of partially uncoiled 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 su
44、rface, including edges, after two 60-second immersions in a copper 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 c
45、hemically nonreactive container in which a bright piece of copper 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
46、 acid that might be present is to be neutralized by the addition 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
47、). The solution is then to be ltered. 10.3 At one end of a sample 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 su
48、rface 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 than three times the conduit diameter. Three 6-inch (150-mm) axial measurement specimens are to be cut from the partial
49、ly uncoiled conduit. Additionally, three straight 6-inch (150-mm) specimens are to be cut from a sample length of the zinc-coated steel before forming. 10.4 With prudent attention to health and re risks, the six specimens are to be cleaned with an organic solvent. Each specimen is to be examined for evidence of damage to the zinc coating during specimen preparation (not during forming). Only specimens that are not damaged are to be sele
