1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA TC 3-2016Polyvinyl Chloride (PVC) Fittings for Use with Rigid PVC Conduit and TubingNEMA Standards Publication TC 3-2016 Polyvinyl Chloride (PVC) Fittings for Use with Rigid PVC Conduit and Tubing Published by: National Elec
2、trical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2016 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protectio
3、n of Literary and Artistic Works, and the International and Pan American copyright conventions. 2016 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and app
4、roval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the
5、document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. While NEMA administers the process and establishes
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13、MA TC 3-2016 Page i 2016 National Electrical Manufacturers Association Foreword In the preparation of this standards publication, input of users and other interested parties has been sought and evaluated. Inquiries, comments, and proposed or recommended revisions should be submitted to the concerned
14、 NEMA product subdivision by contacting: Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 This standards publication was approved by the Polymer Raceway Section. At the time of publication, the section had th
15、e following members: Anamet Electrical, Inc., Mattoon, IL, AFC Cable Systems, a part of Atkore International, New Bedford, MA, Allied Tube b) a length of rigid PVC conduit to a rigid PVC elbow or other bend; or c) a length of rigid PVC conduit or a rigid PVC elbow or other bend to a box (in conjun
16、ction with a junction box adapter). junction box adapter: An adapter intended for connecting a length of rigid PVC conduit or a rigid PVC elbow or bend to a junction box. female adapter: A fitting intended for joining a length of rigid PVC conduit or a rigid PVC elbow or other bend to threaded metal
17、lic conduit or other male threaded devices. male terminal adapter: A fitting intended for joining a length of rigid PVC conduit or a rigid PVC elbow or other bend to a box through a knockout using a locknut, or to a threaded hub on a metal box, or to any other junction box or other threaded devices.
18、 reducer: A fitting intended for joining lengths of two different sizes of rigid PVC conduit, rigid PVC elbow, or other bend. cap: A fitting intended for closing the ends of unused lengths of rigid PVC conduit. end bell: A fitting intended to provide a bushed opening at the open end of a length of r
19、igid PVC conduit. sweep: A fitting intended to provide a smooth change in direction of a conduit. qualification test: A non-repetitive evaluation conducted on an existing, altered, or new product to determine acceptability. quality control test: An in-plant test that is conducted on a given test fre
20、quency to determine whether a product is in accordance with the specification requirements. NEMA TC 3-2016 Page 4 2016 National Electrical Manufacturers Association Section 3 General Requirements 3.1 Materials Fittings shall be fabricated from extruded stock or shall be molded. Molded fittings shall
21、 be made from a rigid polyvinyl chloride (PVC) compound that meets the minimum cell classification of PVC 12233C or 12154B (with tensile strength of 4,000 psi) in accordance with ASTM D1784. Extruded stock shall meet the requirements of NEMA TC 2. 3.2 Dimensions 3.2.1 Fittings Dimensions of molded f
22、ittings shall comply with Table 1 when determined in accordance with 5.2 and Figure 1. 3.2.2 Compression-Formed Couplings Dimensions of compression-formed EPC-40 and EPC-80 couplings shall comply with Table 4 when determined in accordance with 5.2 and Figure 2. 3.2.3 Elbows Dimensions of EPC-40 and
23、EPC-80 elbows shall comply with Table 4 for integral socket dimensions and with Table 5 for other dimensions when determined in accordance with 5.2 and Figure 3. 3.3 Depth of Penetration Fittings shall be provided with a stop at the socket bottom to limit the depth of penetration of the conduit and,
24、 in the case of female adapters, to limit the depth of penetration of threaded rigid metallic conduit. 3.4 Threads External and internal tapered threads shall comply with Table 2 when measured in accordance with 5.3. External and internal straight threads shall comply with Table 3 when measured in a
25、ccordance with 5.3. Internal molded threads at the face of the fittings and the entering ends of external threads shall have a “blunt start,” produced by making the width of the thread at the start approximately 50-75% of the full thread to provide easy entrance in making a joint and protection of t
26、he thread. The blunt start shall be included in the measurement of the thread length. The entrance to machined threads shall be a 45 chamfer at least one-thread deep. NEMA TC 3-2016 Page 5 2016 National Electrical Manufacturers Association Table 1 Sizes and Dimensions of PVC Fittings Trade Size Metr
27、ic Designator A B C D E EW EX EZ N F Socket Entrance Diameter Socket Bottom Diameter Minimum Dimensions Throat Diameters in Male and Female Adapters Average Tolerances on Average Max. Total Out-of- Roundness Tolerances Average Tolerances on Average Max. Total Out-of- Roundness Tolerances Socket Dept
28、h Inside Diameter Wall Thickness Wall Thickness at Entrance Stop End Thick-ness Max. Min. U.S. CUSTOMARY UNITS 16 0.852 0.004 0.016 0.836 0.004 0.016 0.652 0.630 0.095 1/32 1/32 1/32 3/32 0.622 0.560 21 1.064 0.004 0.020 1.046 0.004 0.020 0.719 0.834 0.095 1/32 1/32 1/32 3/32 0.824 0.742 1 27 1.330
29、0.005 0.020 1.310 0.005 0.020 0.875 1.059 0.100 1/16 1/16 1/16 3/32 1.049 0.944 1 35 1.677 0.005 0.024 1.655 0.005 0.024 0.938 1.392 0.120 1/16 1/16 1/16 3/32 1.380 1.242 1 41 1.918 0.006 0.024 1.894 0.006 0.024 1.062 1.622 0.120 1/16 1/16 1/16 3/32 1.610 1.449 2 53 2.393 0.006 0.024 2.369 0.006 0.0
30、24 1.125 2.079 0.130 1/16 1/16 1/16 3/32 2.067 1.860 2 63 2.890 0.007 0.030 2.868 0.007 0.030 1.469 2.484 0.165 3/32 1/8 1/8 3/16 2.469 2.222 3 78 3.515 0.008 0.030 3.492 0.008 0.030 1.594 3.083 0.216 3/32 1/8 1/8 3/16 3.068 2.761 3 91 4.015 0.008 0.030 3.992 0.008 0.030 1.687 3.598 0.226 3/32 1/8 1
31、/8 3/16 3.548 3.193 4 103 4.515 0.009 0.030 4.491 0.009 0.030 1.750 4.076 0.237 3/32 1/8 1/8 3/16 4.026 3.623 5 129 5.593 0.010 0.060 5.553 0.010 0.060 1.937 5.097 0.258 3/32 1/8 1/8 3/16 5.047 4.542 6 155 6.658 0.011 0.060 6.614 0.011 0.060 2.125 6.115 0.280 1/8 3/16 3/16 1/4 6.065 5.458 8* 200 - -
32、 - - - - - - - - - - - - - METRIC UNITS 16 21.64 0.10 0.41 21.23 0.10 0.41 16.56 16.00 2.41 0.79 0.79 0.79 2.38 15.80 14.22 21 27.03 0.10 0.51 26.57 0.10 0.51 18.26 21.18 2.41 0.79 0.79 0.79 2.38 20.93 18.85 1 27 33.78 0.13 0.51 33.27 0.13 0.51 22.22 26.90 2.54 1.59 1.59 1.59 2.38 26.64 23.98 1 35 4
33、2.60 0.13 0.61 42.04 0.13 0.61 23.83 35.36 3.05 1.59 1.59 1.59 2.38 35.05 31.55 1 41 48.72 0.15 0.61 48.11 0.15 0.61 26.97 41.20 3.05 1.59 1.59 1.59 2.38 40.89 36.80 2 53 60.78 0.15 0.61 60.17 0.15 0.61 28.58 52.81 3.30 1.59 1.59 1.59 2.38 52.50 47.24 2 63 70.41 0.18 0.76 72.85 0.18 0.76 37.31 63.09
34、 4.19 2.38 3.18 3.18 4.76 62.71 56.44 3 78 89.28 0.20 0.76 88.70 0.20 0.76 40.49 78.31 5.49 2.38 3.18 3.18 4.76 77.92 70.13 3 91 101.98 0.20 0.76 101.40 0.20 0.76 42.85 91.39 5.74 2.38 3.18 3.18 4.76 90.12 81.10 4 103 114.68 0.23 0.76 114.07 0.23 0.76 44.45 103.53 6.02 2.38 3.18 3.18 4.76 102.26 92.
35、02 5 129 142.06 0.25 1.52 141.05 0.25 1.52 49.20 129.46 6.55 2.38 3.18 3.18 4.76 128.19 115.37 6 155 169.11 0.28 1.52 168.00 0.28 1.52 53.98 155.32 7.11 3.18 4.76 4.76 6.35 154.05 138.63 8* 200 - - - - - - - - - - - - - - - * Dimensions specified by the manufacturerNEMA TC 3-2016 Page 6 2016 Nationa
36、l Electrical Manufacturers Association Figure 1 Molded Fitting Dimensions NEMA TC 3-2016 Page 7 2016 National Electrical Manufacturers Association Table 2 Dimensions for External and Internal Tapered Threads Trade Size Metric Designator Threads per Inch External Threads Internal Threads Pitch Diamet
37、er* at End of Fitting, Inches Length of Thread, Inches American National Pipe Taper (NPT) Thread that Gauge Will Enter Taper Inch per Foot Effective L2Overall L4* Maximum Turns Minimum Turns 16 14 0.7584 0.53 0.78 9 6 21 14 0.9677 0.55 0.79 9 6 1 27 11 1.2136 0.68 0.98 9 6 1 35 11 1.5571 0.71 1.01 1
38、0 6 1 41 11 1.7961 0.72 1.03 10 6 2 53 11 2.2690 0.76 1.06 20 6 2 63 8 2.7195 1.14 1.57 20 6 3 78 8 3.3406 1.20 1.63 20 6 3 91 8 3.8375 1.25 1.68 11 7 4 103 8 4.3344 1.30 1.73 11 7 5 129 8 5.3907 1.41 1.84 11 7 6 155 8 6.4461 1.51 1.95 11 7 8* 200 - - - - - - * The applicable tolerances: Thread leng
39、th (L4): 1 thread Pitch diameter: 1 turn is the maximum variation permitted from the gauging face of the working thread gauges. This is equivalent to 1 turns from basic dimensions, since a variation of turn from basic dimensions is permitted in working gauges. The above pitch diameter for external t
40、hreads with a taper of in. per ft. is identical to the specifications in ANSI/ASME B1.20.1 and GSA H28. Note 1: At least five full threads shall be provided unless otherwise specified. Note 2: Metric conversion units are not applicable to these American National Standard thread dimensions. * Dimensi
41、ons specified by the manufacturer NEMA TC 3-2016 Page 8 2016 National Electrical Manufacturers Association Table 3 Dimensions for External and Internal Straight Threads Trade Size Metric Designator Threads per Inch External ThreadsPitch Diameter, Inches Internal ThreadsPitch Diameter, Inches, of Str
42、aight Internal Threads for: Bushings and Other Fittings Locknuts Minimum Maximum Minimum Maximum Minimum Maximum 16 14 0.770 0.776 0.781 0.788 0.801 0.808 21 14 0.981 0.987 0.992 0.999 1.011 1.018 1 27 11 1.228 1.236 1.244 1.252 1.266 1.274 1 35 11 1.573 1.581 1.588 1.596 1.611 1.619 1 41 11 1.812 1
43、.820 1.827 1.835 1.850 1.858 2 53 11 2.286 2.294 2.301 2.309 2.323 2.332 2 63 8 2.748 2.758 2.769 2.781 2.801 2.813 3 78 8 3.375 3.385 3.396 3.408 3.428 3.439 3 91 8 3.875 3.885 3.896 3.908 3.928 3.940 4 103 8 4.373 4.383 4.394 4.406 4.426 4.438 5 129 8 5.435 5.445 5.456 5.468 5.488 5.500 6 155 8 6.
44、492 6.502 6.513 6.525 6.545 6.557 8* 200 - - - - - - - * Dimensions specified by the manufacturer Note 1: All dimensions are rounded to the nearest third decimal place. Note 2: Metric conversion units are not applicable to these American National Standard thread dimensions. NEMA TC 3-2016 Page 9 201
45、6 National Electrical Manufacturers Association Figure 2 Compression-Formed Couplings EPC-40 and EPC-80 Figure 3 Elbows NEMA TC 3-2016 Page 10 2016 National Electrical Manufacturers Association Table 4 Dimensions for Compression-Formed EPC-40 and EPC-80 Couplings Trade Size Metric Designator A B C D
46、 E N Socket Diameters Socket Depth Minimum Throat Diameter Minimum Wall Thickness Minimum Minimum Throat Length At Entrance At Bottom Maximum Minimum Average Maximum Minimum Average EPC-40 EPC-80 U.S. CUSTOMARY UNITS 16 0.860 0.844 0.852 0.004 0.844 0.828 0.836 0.004 0.652 0.630 0.095 0.129 3/32 21
47、1.074 1.054 1.064 0.004 1.056 1.036 1.046 0.004 0.719 0.834 0.095 0.136 3/32 1 27 1.340 1.320 1.330 0.005 1.320 1.300 1.310 0.005 0.875 1.059 0.100 0.158 3/32 1 35 1.689 1.665 1.667 0.005 1.667 1.643 1.655 0.005 0.938 1.392 0.120 0.168 3/32 1 41 1.930 1.906 1.918 0.006 1.906 1.882 1.894 0.006 1.062
48、1.622 0.120 0.168 3/32 2 53 2.405 2.381 2.393 0.006 2.381 2.357 2.369 0.006 1.125 2.079 0.130 0.181 3/32 2 63 2.905 2.875 2.890 0.007 2.883 2.853 2.868 0.007 1.469 2.484 0.165 0.229 3/16 3 78 3.530 3.500 3.515 0.008 3.507 3.477 3.492 0.008 1.594 3.083 0.179 0.249 3/16 3 91 4.065 3.965 4.015 0.008 4.
49、007 3.977 3.992 0.008 1.687 3.598 0.188 0.264 3/16 4 103 4.565 4.465 4.515 0.009 4.506 4.476 4.491 0.009 1.750 4.076 0.197 0.280 3/16 5 129 5.643 5.543 5.593 0.010 5.583 5.523 5.553 0.010 1.937 5.097 0.214 0.311 3/16 6 135 6.708 6.608 6.658 0.011 6.644 6.584 6.614 0.011 2.125 6.115 0.232 0.359 1/4 *8 200 - - - - - - - - - - - METRIC UNITS
