1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1990 Nonmetallic Underground Conduit with Conductors STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHT
2、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Nonmetallic Underground Conduit with Conductors, UL 1990 Third Edition, Dated November 22, 2013 Summary of Topics Reaffirmation and Continuance of the Third Edition of the Standa
3、rd for Safety for Nonmetallic Underground Conduit with Conductors, UL 1990, as an American National Standard. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The revisions are substantially in accordance with Prop
4、osal(s) on this subject dated February 5, 2016. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Sta
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8、ntroduced while purchaser is storing an electronic Standard on the purchasers computer system. APRIL 15, 2016 UL 1990 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 15, 2016 UL 1990 tr2 No Text on This PageUL COPYRIGHTED MATERIAL N
9、OT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 22, 2013 (Title Page Reprinted: April 15, 2016) 1 UL 1990 Standard for Nonmetallic Underground Conduit with Conductors First Edition April, 1998 Second Edition August, 2005 Third Edition November 22, 2013 This
10、 ANSI/UL Standard for Safety consists of the Third Edition including revisions through April 15, 2016. The most recent designation of ANSI/UL 1990 as a Reaffirmed American National Standard (ANS) occurred on April 15, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pa
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12、ther 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 property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 1990-2011 (R2016)UL COPYR
13、IGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 15, 2016 NONMETALLIC UNDERGROUND CONDUIT WITH CONDUCTORS - UL 1990 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL
14、 CONTENTS INTRODUCTION 1 Scope .4 2 Undated References 4 3 Units of Measurement .5 CONSTRUCTION 4 General 5 5 Materials .5 6 Dimensions 5 7 Conductors or Cable 8 PERFORMANCE 8 General 8 9 Identication of Compounds 9 10 Water Absorption Test .9 11 Low Temperature Handling Test 9 12 Tensile Strength .
15、10 12.1 General .10 12.2 Preparation of specimens 10 12.3 Conduct of the test 12 12.4 Results 12 13 Crush Test .13 14 Impact Test .14 15 Moisture Penetration Test 14 16 Deection Under Heat and Load Tests .15 16.1 General .15 16.2 Preparation of specimens 15 16.3 Conduct of test .16 16.4 Results 19 1
16、7 Direct Burial Crush Test .20 MARKINGS 18 Details .20 NOVEMBER 22, 2013 NONMETALLIC UNDERGROUND CONDUIT WITH CONDUCTORS - UL 1990 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover nonmetallic
17、 underground conduit with conductors. These products consist of a factory assembly of conductors or cables inside a coilable, smooth-wall, continuous length conduit with a circular cross section. The conduit is Schedule-40, Schedule-80, EPEC-A or EPEC-B High Density Polyethylene (HDPE) in trade size
18、s 1/2 (16) 4 (103). This product is intended for installation in accordance with the National Electrical Code, NFPA 70. The values in parentheses are metric trade designators of conduit. The designations Schedule-40, Schedule-80, EPEC-A and EPEC-B refer to conduit having specic outside diameters and
19、 wall thicknesses. 1.2 This product is for aboveground use where encased in not less than 2 inches (51 mm) of concrete and for underground use by direct burial or encasement in concrete. 2 Undated References 2.1 Where reference is made to other publications, such reference shall be considered to ref
20、er to the latest edition and all amendments published to that edition up to the time when this standard was published. UL Standards UL 746A Standard for Polymeric Materials Short Term Property Evaluations ANSI Standards NFPA 70 National Electrical Code ASTM Standards D 570 Standard Test Method for W
21、ater Absorption of Plastics D 638 Standard Test Method for Tensile Properties of Plastics D 648 Standard Test Method for Deection Temperature of Plastics Under Flexural Load in the Edgewise Position D 2412 Standard Test Method for Determination of External Loading Characteristics of Plastic Pipe by
22、Parallel Plate Loading D 3350 Standard Specication for Polyethylene Plastics Pipe and Fittings Materials NOVEMBER 22, 2013 NONMETALLIC UNDERGROUND CONDUIT WITH CONDUCTORS - UL 1990 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Units of
23、Measurement 3.1 When a value for measurement is followed by a value in other units in parentheses, the rst stated value is the requirement. CONSTRUCTION 4 General 4.1 Conduit shall be essentially circular in cross section. The inside surface of conduit shall be without indentations (normal convoluti
24、ons are not to be considered as indentations), projections, roughness, or other features that could damage or impede wires and cables being pulled into the conduit. 4.2 Both ends of each length of conduit shall be perpendicular to the longitudinal axis of the conduit. 4.3 Conduit shall provide a smo
25、oth raceway for the pulling in of wires and cables. It shall not have any features that can abrade or otherwise damage wires and cables. The outside surfaces of conduit shall be smooth and without any chips, blister, cracks, or other defects. There shall not be any tendency for the conduit to peel,
26、scale, ake, chalk, or crumble. 5 Materials 5.1 The HDPE compound of which the conduit is made shall equal or exceed the cell classication PE334420C or E as described in the Standard Specication for Polyethylene Plastics Pipe and Fittings Materials, ASTM D 3350. 6 Dimensions 6.1 Limits on the outside
27、 diameter of Schedule-40, Schedule-80, EPEC-A, and EPEC-B conduit are specied in Table 6.1. Limits on the wall thicknesses of Schedule-40, Schedule-80, EPEC-A, and EPEC-B conduit are specied in Tables 6.2 and 6.3. Table 6.1 Conduit outside diameter Trade size Metric Designator Outside diameter, inch
28、es (mm) Average Maximum Minimum 1/2 (16) 0.84 0.004 (21.34 0.10) 0.855 (21.72) 0.825 (20.96) 3/4 (21) 1.050 0.004 (26.67 0.10) 1.070 (27.18) 1.030 (26.96) 1 (27) 1.315 0.005 (33.40 0.13) 1.340 (34.04) 1.290 (32.77) 1-1/4 (35) 1.660 0.005 (42.16 0.13) 1.685 (42.80) 1.635 (41.53) 1-1/2 (41) 1.900 0.00
29、6 (48.26 0.15) 1.930 (49.02) 1.870 (47.50) 2 (53) 2.375 0.006 (60.32 0.15) 2.410 (61.21) 2.340 (59.44) 2-1/2 (63) 2.875 0.007 (73.02 0.18) 2.910 (73.91) 2.840 (72.14) 3 (78) 3.500 0.008 (88.90 0.20) 3.540 (89.92) 3.460 (87.88) 3-1/2 (91) 4.000 0.008 (101.60 0.20) 4.045 (102.74) 3.955 (100.46) 4 (103
30、) 4.500 0.009 (114.30 0.23) 4.550 (115.57) 4.450 (113.03) NOVEMBER 22, 2013 NONMETALLIC UNDERGROUND CONDUIT WITH CONDUCTORS - UL 1990 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 6.2 Conduit wall thickness, types Schedule-40 and Sc
31、hedule-80 Trade size Metric Designator Wall thickness, inches (mm) Schedule-40 Schedule-80 Maximum Minimum Maximum Minimum 1/2 (16) 0.129 (3.28) 0.109 (2.77) 0.167 (4.24) 0.147 (3.73) 3/4 (21) 0.133 (3.38) 0.113 (2.87) 0.174 (4.42) 0.154 (3.91) 1 (27) 0.153 (3.89) 0.133 (3.38) 0.200 (5.08) 0.179 (4.
32、55) 1-1/4 (35) 0.160 (4.06) 0.140 (3.56) 0.214 (5.44) 0.191 (4.85) 1-1/2 (41) 0.165 (4.20) 0.145 (3.68) 0.224 (5.69) 0.200 (5.08) 2 (53) 0.174 (4.42) 0.154 (3.91) 0.244 (6.20) 0.218 (5.54) 2-1/2 (63) 0.227 (5.57) 0.203 (5.16) 0.309 (7.85) 0.276 (7.01) 3 (78) 0.242 (6.15) 0.216 (5.49) 0.336 (8.53) 0.
33、300 (7.62) 3-1/2 (91) 0.253 (6.43) 0.226 (5.74) 0.356 (9.04) 0.318 (8.08) 4 (103) 0.265 (6.73) 0.237 (6.02) 0.377 (9.58) 0.337 (8.56) Table 6.3 Conduit wall thickness, Types EPEC-A and EPEC-B Trade size Metric Designator Wall thickness, inches (mm) EPEC-A EPEC-B Maximum Minimum Maximum Minimum 1/2 (
34、16) 0.080 (2.03) 0.060 (1.52) 0.096 (2.44) 0.076 (1.93) 3/4 (21) 0.080 (2.03) 0.060 (1.52) 0.098 (2.49) 0.078 (1.98) 1 (27) 0.095 (2.41) 0.075 (1.91) 0.117 (2.97) 0.097 (2.46) 1-1/4 (35) 0.120 (3.05) 0.100 (2.54) 0.143 (3.63) 0.123 (3.12) 1-1/2 (41) 0.135 (3.43) 0.115 (2.92) 0.161 (4.09) 0.141 (3.58
35、) 2 (53) 0.165 (4.19) 0.145 (3.68) 0.197 (5.00) 0.176 (4.47) 2-1/2 (63) 0.223 (5.66) 0.203 (5.16) 0.238 (6.05) 0.213 (5.41) 3 (78) 0.236 (5.99) 0.216 (5.49) 0.290 (7.37) 0.259 (6.58) 3-1/2 (91) aaaa 4 (103) 0.265 (6.73) 0.237 (6.02) 0.373 (9.47) 0.333 (8.46) a To be developed. 6.2 Conduit on which m
36、easurements are made is to be nished, smooth, and clean wherever it is to touch any part of a measuring device or tool. While measurements are being made, the conduit and the air around it are to be in thermal equilibrium with one another at a temperature of 23.0 2.0C (73.4 3.6F). All of the average
37、 and individual outside diameter measurements are to be performed both at the center and at least one end of the conduit. 6.3 The measurements from which the average outside diameters of a length of nished conduit are to be determined are to be made by means of: a) A machinists micrometer caliper th
38、at has a at-ended spindle, a at anvil, and is calibrated to read directly to at least 0.001 inch or 0.01 mm; b) A vernier caliper calibrated to read directly to at least 0.001 inch or 0.01 mm; c) A vernier wrap tape, calibrated to read directly to at least 0.001 inch or 0.01 mm; NOVEMBER 22, 2013 NO
39、NMETALLIC UNDERGROUND CONDUIT WITH CONDUCTORS - UL 1990 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL d) A tapered sleeve gauge accurate to 1 percent of its taper and 0.001 inch or 0.01 mm of its diameter; or e) A sleeve window gauge accu
40、rate to within 1 percent of its tape and 0.001 inch of its diameter. 6.4 When differences arise between measuring techniques, the vernier wrap tape is to act as the referee for determining compliance with the requirements for average outside diameters. 6.5 When using a tapered sleeve gauge, the entr
41、ance and exit diameters of the gauge shall correspond to the maximum and minimum outside diameters for the trade size of conduit being measured. 6.6 When using a sleeve window gauge, the window shall extend beyond the two scribed marks which shall represent the minimum and maximum permitted diameter
42、s. 6.7 The measurements from which the minimum and maximum outside diameters of nished conduit are to be determined are to be made by means of: a) A machinists micrometer caliper that has a at-ended spindle, a at anvil, and is calibrated to read directly to at least 0.001 inch or 0.01 mm; b) A verni
43、er caliper calibrated to read directly to at least 0.001 inch or 0.01 mm; or c) An out-of-roundness gauge accurate to 0.001 inch or 0.01 mm. 6.8 When differences arise between measuring techniques, the vernier caliper is to act as the referee for determining compliance with the requirements for mini
44、mum and maximum outside diameters. 6.9 The measurements from which the wall thicknesses of a length of nished conduit are to be determined are to be made by means of a machinists micrometer caliper that has a ratchet, a at-ended spindle, and a hemispherical anvil. The caliper shall be calibrated to
45、read directly to at least 0.001 inch or 0.01 mm. 6.10 When deemed necessary, equivalent methods, tools, and measurement techniques shall be used to determine compliance with the above dimensional requirements only when they are accurate to within 0.001 inch or 0.01 mm. 6.11 To determine the average
46、outside diameter when using a micrometer caliper or vernier caliper, at least four measurements (every 45 degrees) are required at each location to make certain that the largest and smallest diameters are found. The average of all the recorded diameters is to be determined for the trade size of cond
47、uit involved. The average of the recorded diameters shall not differ from the average diameter in Table 6.1 by more than the specied tolerances. 6.12 To determine the average outside diameter when using vernier wrap tape, place the vernier wrap tape around the conduit making sure that it is at right
48、 angles to the conduit axis and is at against the conduit surface. The observed reading shall not differ from the average diameter in Table 6.1 by more than the specied tolerances. NOVEMBER 22, 2013 NONMETALLIC UNDERGROUND CONDUIT WITH CONDUCTORS - UL 1990 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
49、 FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.13 To determine the average outside diameter when using a tapered sleeve gauge or sleeve window gauge, cut the end of the conduit square and remove burrs. Insert the conduit into the sleeve gauge and observe the position of the end with respect to the ends of the tapered sleeve gauge or the position of the end with regard to the minimum and maximum scribed marks of the sleeve window
