1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA TC 13-2014Electrical NonmetallicTubing (ENT)NEMA Standards Publication TC 13-2014 Electrical Nonmetallic Tubing (ENT) Published by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Vir
2、ginia 22209 www.nema.org 2014 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American copyr
3、ight conventions. 2014 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 approval of the document at the time it was developed. Consensus does not necessa
4、rily 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 document contained herein is one, are developed through a voluntary consensus
5、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 rules to promote fairness in the development of consensus, it does not write
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8、published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any individual manufacturer or sellers products or services by virtue of this standard or guide.
9、In publishing and making this document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her
10、own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Information and other standards on the topic covered by this publication may be available from other sources, which the user may wish to
11、 consult for additional views or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any ce
12、rtification or other statement of compliance with any health- or safety-related information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. NEMA TC 13-2014 Page i 2014 National Electrical Manufacturers Association Forewo
13、rd This standard for Electrical Nonmetallic Tubing (ENT) is intended to: a. List dimensions and other significant requirements; b. Set forth some of the properties of these products and assist in selecting and obtaining the proper product for a particular need. User needs have been considered during
14、 the development of these standards. The Polymer Raceway Products Section (5TC) of NEMA, through its members, has worked (and continues to work) closely with such organizations as ASTM, the Plastics Pipe Institute, appropriate government agencies, testing laboratories, and others in the periodic rev
15、iew and revision of these standards for any changes necessary to remain current. NEMA TC 13-2014 revises and supersedes NEMA TC 13-2005. NEMA TC 13-2014 was approved by the NEMA Polymer Raceway Products Section. Approval does not necessarily imply that all members of the Section voted for its approv
16、al. At the time of approval, the Section consisted of the following members: Anamet Electrical, Inc.htt p:/Mattoon, IL AFC Cable Systems, a part of Atkore I New Bedford, MA Allied Tube and Conduit, a part of Atkore I Harvey, IL Champion Fiberglass, Inc. Spring, TX FRE Composites (2005) I St. Andre-d
17、Argenteuil, PQ, Canada Hubbell I Shelton, CT IPEX USA, LLC Mississauga, ON, Canada Legrand North Americawww.legrand.us West Hartford, CT Panduit C Tinley Park, IL Royal Building P ShelbyTownship, MI Southern Pipe, Inc.www.southern- New London, NC Thomas b) flat, level bed made from either aluminum o
18、r steel, approximately 8 in. x 12 in. x 1 in. (200 mm x 300 mm x 25 mm). The bed shall have a V-groove depth to support the sample. The bottom of the groove shall have an angle of approximately 120, and the groove depth shall be NEMA TC 13-2014 Page 8 2014 National Electrical Manufacturers Associati
19、on approximately 9/64 in. (3.5 mm). These dimensions provide a groove width of approximately in. (12 mm). All edges shall be rounded to a radius of approximately 0.06 in. (1.5 mm). c) guide tube or guide rails to ensure that the tup impacts the sample at the top of a vertical diameter. NOTEUse of au
20、xiliary equipment for the tup release, tup elevation, and the like, meets the intent of the requirement. 5.6 RESISTANCE TO MECHANICAL ABUSE (BENDING) 5.6.1 Test Method 1 A 30 in. (750 mm) length of ENT for each trade size shall be bent 90 around a mandrel with a radius as specified in Table 4. Tensi
21、on shall be applied to the specimen under test as necessary to cause the ENT to conform closely to the curved surface. Distortion of the internal circular cross-section shall be determined by the free passage of a sphere or equivalent through the bore of the ENT. The sphere diameter shall be as spec
22、ified in Table 5. 5.6.2 Test Method 2 Six samples of each trade size of ENT shall be conditioned at a temperature of -4 1.8F (-20 1C) for a period of four hr. The samples shall be removed from the cold chamber one at a time and immediately bent (360) around the mandrel specified in Table 4. Tension
23、shall be applied to each specimen as necessary to cause the ENT to conform closely to the curved surface. While in this position, the specimen shall be examined carefully for evidence of cracking, chipping, or rupture. Table 4 Mandrel Sizes Trade Size Metric Designators Radius in. (mm) 16 3.4 (87) 2
24、1 4.7 (119) 1 27 6.0 (152) 1 35 8.0 (204) 1 41 9.4 (239) 2 53 12.0 (305) 2 63 15.0 (381) NEMA TC 13-2014 Page 9 2014 National Electrical Manufacturers Association Figure 2 Tup Geometry Table 5 Sphere Sizes Trade Size Metric Designators Radius in. (mm) 16 0.49 (12.4) 21 0.66 (16.8) 1 27 0.85 (21.6) 1
25、 35 1.14 (28.9) 1 41 1.33 (33.9) 2 53 1.72 (43.6) 2 63 2.13 (54.1) 5.7 TENSION TEST Six 20 in. (500 mm)long samples shall be cut from ENT. The ends of each sample are to be smooth and perpendicular to the longitudinal axis of the ENT. A grip shall be fitted to each end of the sample. If needed to su
26、pport the tubing, a smooth plug can be placed inside the tubing under the grip and up to one inch beyond the grip. The samples are then connected to the weight, and the load (see Table 3) is maintained for one min without breaking. Alternately, a tensile machine can be used to test the samples using
27、 a speed of 2-3 in./min (50-75 mm/min) until the load for each trade size is reached. This level shall be held for one min. NEMA TC 13-2014 Page 10 2014 National Electrical Manufacturers Association 5.8 FLAMMABILITY 5.8.1 Vertical Flame (500W Burner) Using the test apparatus specified for the Vertic
28、al Flame Test in UL 1581, Section 1060, and for the Vertical Test/FT1 (Nominal 500W) in CAN/CSA C22.2 No. 0.3, Clause 4.11.1, the flame shall be applied five times to three samples of each trade size, each approximately 18 in. (450 mm) in length, for 15 sec. 5.8.2 (Optional) Flame Test in Cable Tray
29、s, FT4 Samples of finished ENT shall be tested in accordance with the Vertical Flame Test (FT4)Conduit or Tubing on Cable Tray, in CAN/CSA C22.2 No. 211.0, Clause 6.16. 5.9 SECURENESS OF FITTINGS Three samples of ENT, 15 in. (385 mm) in length, shall be assembled with RNC fittings using solvent ceme
30、nting methods recommended by the manufacturer. The assemblies shall be conditioned for a period of seven hours in an air-circulating oven at 194 1.8F (90 1C). The test assemblies shall be cooled to room temperature. Each assembly shall be tested by applying a 150 lbf (667 N) between each fitting and
31、 its associated length of ENT for a period of five min. NEMA TC 13-2014 Page 11 2014 National Electrical Manufacturers Association Section 6 MARKINGS The outer surface of every length of ENT shall be permanently marked at intervals not greater than 60 in. (1.5 m) with the name or trademark of the ma
32、nufacturer. Supplementary information shall be provided as follows: a) “ENT”; b) “NEMA TC 13”; c) the metric designator and the trade size; d) “FT4” when tested in accordance with 5.8.2; e) “For use in residential attics up to 900 mm (3 ft) above the bottom of the ceiling joist” when the ENT material complies with 3.1; f) “PVC”; g) other information desired by the manufacturer. NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION 1300 NORTH 17TH STREET, SUITE 900 ROSSLYN. VA 22209www.NEMA.orgTO ORDER ADDITIONAL NEMA STANDARDS VISITWWW.GLOBAL.IHS.COM OR CALL 1-800-854-7179/1-303-397-79565612_0514TB
