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 This revision was issued to incorporate the following changes: 1
3、. Revised Title for Section 13 2. Add a Test Temperature Requirement into Clause 13.2 3. Revised Table 13.1 The revisions are substantially in accordance with Proposal(s) on this subject dated November 18, 2016. Text that has been changed in any manner or impacted by ULs electronic publishing system
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8、troduced while purchaser is storing an electronic Standard on the purchasers computer system. JANUARY 20, 2017 UL 1990 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 20, 2017 UL 1990 tr2 No Text on This PageUL COPYRIGHTED MATERIA
9、L NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 22, 2013 (Title Page Reprinted: January 20, 2017) 1 UL 1990 Standard for Nonmetallic Underground Conduit with Conductors First Edition April, 1998 Second Edition August, 2005 Third Edition November 22, 2013
10、 This ANSI/UL Standard for Safety consists of the Third Edition including revisions through January 20, 2017. The most recent designation of ANSI/UL 1990 as an American National Standard (ANSI) occurred on January 20, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pa
11、ges, 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 Standards Development System (CSDS) at https:/. ULs Standards for Safety are copyrighted by UL. N
12、either 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 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 1990-2017UL COPYRIGHTED
13、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 20, 2017 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 CON
14、TENTS 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 10 12
15、.1 General .10 12.2 Preparation of specimens .10 12.3 Conduct of the test .12 12.4 Results .12 13 Deection 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 JANUARY 20, 2017 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 sizes
18、 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 refe
20、r 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 Wa
21、ter 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 P
22、arallel 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 M
23、easurement 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 convolutio
24、ns 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 smoo
25、th 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, s
26、cale, 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, inche
28、s (mm) Average Maximum Minimum 1/2 (16) 0.84 0.004 (21.340.10) 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 0.006
29、(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 Sche
31、dule-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 (4.55
32、) 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) 0.30
33、0 (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 (16
34、) 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 ( 9 1 )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 whi
36、ch 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 23.0 2.0C (73.4 3.6F). All of the ave
37、rage 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 calipe
38、r 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 0.001 inch or 0.01 mm; NOVEMBER 22, 201
39、3 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 diameter; or e) A sleeve window gauge
40、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 using a tapered sleeve gauge, the
41、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 minimum and maximum permitted diam
42、eters. 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 v
43、ernier 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
44、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 anvil. The caliper shall be calibrated
45、 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 0.01 mm. 6.11 To determine the aver
46、age 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
47、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 conduit making sure that it is at r
48、ight 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
49、 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 maximum scribed marks of the sleeve window gauge. 6.14 When using
