1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1990 Nonmetallic Underground Conduit with ConductorsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTH
2、ORIZED 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 This Third Edition of ANSI/UL 1990 has been issued as an editorial update only. No c
3、hanges in requirements have been made. 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 Standard as
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8、affected item. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. NOVEMBER 22, 2013 UL 1990 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTI
9、ON WITHOUT PERMISSION FROM UL NOVEMBER 22, 2013 UL 1990 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 22, 2013 1 UL 1990 Standard for Nonmetallic Underground Conduit with Conductors First Edition April, 199
10、8 Second Edition August, 2005 Third Edition November 22, 2013 This ANSI/UL Standard for Safety consists of the Third Edition. The most recent designation of ANSI/UL 1990 as an American National Standard (ANSI) occurred on October 6, 2011. ANSI approval for a standard does not include the Cover Page,
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12、dards 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 property of UL. COPYRIGHT 2013 UNDERWRITERS LABORATO
13、RIES INC. ANSI/UL 1990-2011UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 22, 2013 NONMETALLIC UNDERGROUND CONDUIT WITH CONDUCTORS - UL 1990 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR D
14、ISTRIBUTION WITHOUT PERMISSION FROM UL 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
15、Handling Test .9 12 Tensile Strength 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.
16、3 Conduct of test 16 16.4 Results .19 17 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
17、.1 These requirements cover nonmetallic 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 De
18、nsity Polyethylene (HDPE) in trade sizes 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 cond
19、uit having specic outside diameters and 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, su
20、ch reference shall be considered to refer 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 Sta
21、ndards D 570 Standard Test Method for Water 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 Load
22、ing Characteristics of Plastic Pipe by 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
23、 WITHOUT PERMISSION FROM UL 3 Units of 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
24、 without indentations (normal convolutions 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 c
25、onduit. 4.3 Conduit shall provide a smooth 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
26、 any tendency for the conduit to peel, 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.
27、 6 Dimensions 6.1 Limits on the outside 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 M
28、etric Designator Outside diameter, inches (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.
29、80) 1.635 (41.53) 1-1/2 (41) 1.900 0.006 (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 0.2
30、0) 4.045 (102.74) 3.955 (100.46) 4 (103) 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 w
31、all thickness, types Schedule-40 and Schedule-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.
32、89) 0.133 (3.38) 0.200 (5.08) 0.179 (4.55) 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.
33、242 (6.15) 0.216 (5.49) 0.336 (8.53) 0.300 (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-
34、B Maximum Minimum Maximum Minimum 1/2 (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
35、) 0.115 (2.92) 0.161 (4.09) 0.141 (3.58) 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
36、To be developed. 6.2 Conduit on which measurements 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
37、.0 2.0C (73.4 3.6F). All of the average 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
38、: 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 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 0.00
39、1 inch or 0.01 mm; NOVEMBER 22, 2013 NONMETALLIC 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 dia
40、meter; or e) A sleeve window gauge accurate 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
41、 using a tapered sleeve gauge, the entrance 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
42、 minimum and maximum permitted diameters. 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
43、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; 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 co
44、mpliance with the requirements for minimum 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 anv
45、il. The caliper shall be calibrated to 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
46、0.01 mm. 6.11 To determine the average 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 b
47、e determined for the trade size of conduit 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
48、conduit making sure that it is at right 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
49、COPYRIGHTED MATERIAL NOT AUTHORIZED FOR 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
