1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA TC 14.XW-2015Extra Heavy Wall Aboveground Reinforced Thermosetting Resin Conduit (RTRC) and FittingsNEMA Standards Publication TC 14.XW-2015 Extra Heavy Wall Aboveground Reinforced Thermosetting Resin Conduit (RTRC) and Fitt
2、ings Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2015 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Be
3、rne Convention for the Protection of Literary and Artistic Works, and the International and Pan American copyright conventions. 2105 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons en
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13、 or maker of the statement. NEMA TC 14.XW-2015 Page i 2015 National Electrical Manufacturers Association Foreword NEMA TC 14.XW-2015 is an adoption of the most recent publication of ANSI/UL 2515A, Edition 1, Supplemental Requirements for Extra Heavy Wall Reinforced Thermosetting Resin (RTRC) and Fit
14、tings, and includes an annex on engineering data calculations not included in the adopted ANSI/UL standard. User needs and safety considerations were addressed during the preparation of NEMA TC 14.XW, which was undertaken by a subgroup of the NEMA Polymer Raceway Products Sections Technical Committe
15、e. During the preparation phase, the following were active participants: Benoit Arsenault FRE Composites Les Easter Allied Tube and Conduit, a part of Atkore International Chris Greene Underground Devices, Inc. Rachel Guenther Thomas & Betts, a member of the ABB Group David Kendall Thomas & Betts, a
16、 member of the ABB Group Andrew Nause IPEX Management, Inc. Kyle Owens Champion Fiberglass Greg Skaper Panduit Corporation Fred Small Hubbell Incorporated Kevin Vyas Anamet Electrical, Inc. NEMA TC 14.XW was approved by the NEMA Polymer Raceway Products Section. Approval does not necessarily imply t
17、hat all members of the Section voted for its approval. At the time of approval, the Section consisted of the following members: Anamet Electrical, Inc. http:/ Mattoon, IL AFC Cable Systems, a part of Atkore International New Bedford, MA Allied Tube and Conduit, a part of Atkore International Harve
18、y, IL Champion Fiberglass, Inc. Spring, TX Electri-Flex Company Roselle, IL FRE Composites St. Andre-dArgenteuil, PQ, Canada Hubbell Incorporated Shelton, CT IPEX Management, Inc. Mississauga, ON, Canada Legrand North America www.legrand.us West Hartford, CT Panduit Corporation Tinley Park, IL
19、 Royal Building Products Shelby Township, MI Southern Pipe, Inc. www.southern- New London, NC Southwire Corporation Carrollton, GA Thomas & Betts, a member of the ABB Group Memphis, TN Underground Devices, Inc. Northbrook, IL United Fiberglass of America Springfield, OH The NEMA Polymer Raceway
20、 Products Section will periodically review this standard and revise the adoptions or modifications as necessary. Proposed or recommended revisions can be submitted to: Director, Industry Operations National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 2220
21、9 NEMA TC 14.XW-2015 Page ii 2105 National Electrical Manufacturers Association Contents Foreword . i Section 1 Scope 1 Section 2 Requirements . 1 2.1 EXTRA HEAVY WALL ABOVEGROUND REINFORCED THERMOSETTING RESIN CONDUIT. 1 Annex A Guidance on Engineering Data Calculations 2 NEMA TC 14.XW-2015 Page 1
22、2015 National Electrical Manufacturers Association Section 1 SCOPE NEMA TC 14.XW is an Adoptive Standard for Reinforced Thermosetting Resin Conduit (RTRC) and RTRC fittings as covered in the most recent publication of ANSI/UL 2515A, Edition 1. Section 2 REQUIREMENTS 2.1 EXTRA HEAVY WALL ABOVEGROUND
23、REINFORCED THERMOSETTING RESIN CONDUIT For all aboveground extra heavy wall conduit (AG Type XW), the most current publication of ANSI/UL 2515A, Edition 1, along with Annex A, is adopted in its entirety. NEMA TC 14.XW-2015 Page 2 2105 National Electrical Manufacturers Association Annex A GUIDANCE ON
24、 ENGINEERING DATA CALCULATIONS A.1 RECOMMENDED MAXIMUM BEAM DEFLECTION The maximum beam deflection is recommended to be no greater than 0.625 in. (15.9 mm). A.2 BEAM DEFLECTION/SUPPORT SPACING CALCULATION The following equation can be used to calculate maximum support spacing for a fixed and uniform
25、ly loaded beam with five or more interior continuous spans loaded and equal in length. L = 240 EIW4Where: L = Distance from support to adjacent support measured in inches W = Unit Load (pounds/linear inch of conduit and cable) E = Flexural modulus in units of pounds force per square inch at 73.4F (2
26、3C) or the maximum ambient temperature anticipated I = Area moment of inertia about the centroidal axis of the conduit cross-section, measured in units of inch to the fourth power 240 = Maximum recommended midspan conduit deflection (0.625 in.) x the constant (384). NOTE Should conduit deflections o
27、ther than in. (15.9 mm) be desired, the above equation can be used to calculate the distance between midspan support. For such a calculation, substitute the desired deflection in inches for 0.625 inch in the equation to obtain a value different than 240. To determine the spacing for the last two spa
28、ns at the ends of the bridge, multiply the midspan spacing by 0.79. A.3 BENDING RADIUS CALCULATION A.3.1 U.S. Units The minimum bending radius in U.S. units can be calculated with a maximum design bending stress of 5,000 psi using the following equation: R = (E)(OD)24 Where: R = minimum radius, ft E
29、 = bending modulus, psi OD = outside diameter, inches = design stress NEMA TC 14.XW-2015 Page 3 2015 National Electrical Manufacturers Association A.3.2 Metric Units The minimum bending radius in metric units can be calculated with a maximum design bending stress of 34.474 MPa using the following eq
30、uation: R = (E)(OD)2000 Where: R = minimum radius, M E = bending modulus, MPa OD = in millimeters = design stress 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
