1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA TC 14.AG-2015Aboveground Reinforced Thermosetting Resin Conduit (RTRC) and FittingsNEMA Standards Publication TC 14.AG-2015 Aboveground Reinforced Thermosetting Resin Conduit (RTRC) and Fittings Published by National Electri
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13、C 14.AG-2015 Page i 2015 National Electrical Manufacturers Association Foreword NEMA TC 14.AG-2015 is an adoption of the most recent publication of CAN/CSA C22.2 No. 2515-09ANSI/UL 2515, Edition 1, Standard for Safety for Aboveground Reinforced Thermosetting Resin Conduit (RTRC) and Fittings. TC 14.
14、AG-2015 supersedes the portions of TC 14-2002 relevant to aboveground RTRC and RTRC fittings and includes an annex on engineering data calculations not included in the adopted ANSI/UL and CAN/CSA standards. User needs and safety considerations were addressed during the preparation of NEMA TC 14.AG,
15、which was undertaken by a subgroup of the NEMA Polymer Raceway Products Sections Technical Committee. During the preparation phase, the following were active participants: Benoit ArsenaultFRE Composites Les EasterAllied Tube and Conduit, a part of Atkore International Chris GreeneUnderground Devices
16、, Inc. Rachel GuentherThomas & Betts, a member of the ABB Group David KendallThomas & Betts, a member of the ABB Group Andrew NauseIPEX Management, Inc. Kyle OwensChampion Fiberglass Greg SkaperPanduit Corporation Fred SmallHubbell Incorporated Kevin VyasAnamet Electrical, Inc. NEMA TC 14.AG was app
17、roved by the NEMA Polymer Raceway Products Section. Approval does not necessarily imply that 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 INew B
18、edford, MA Allied Tube and Conduit, a part of Atkore IHarvey, IL Champion Fiberglass, ISpring, TX Electri-Flex CRoselle, IL FRE CSt. Andre-dArgenteuil, PQ, Canada Hubbell IShelton, CT IPEX Management, IMississauga, ON, Canada Legrand North Americawww.legrand.usWest Hartford, CT Panduit CTinley Park,
19、 IL Royal Building PShelby Township, MI Southern Pipe, Inc.www.southern-New London, NC Southwire CCarrollton, GA Thomas & Betts, a member of the ABB GMemphis, TN Underground Devices, INorthbrook, IL United Fiberglass of ASpringfield, OH The NEMA Polymer Raceway Products Section will periodically rev
20、iew 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 22209 NEMA TC 14.AG-2015 Page ii 2015 Natio
21、nal Electrical Manufacturers Association Contents Foreword . i Section 1 Scope 1 Section 2 Requirements . 1 2.1 ALL ABOVEGROUND REINFORCED THERMOSETTING RESIN CONDUIT AND FITTINGS 1 Annex A Guidance on Engineering Data Calculations . 2 NEMA TC 14.AG-2015 Page 1 2015 National Electrical Manufacturers
22、 Association Section 1 SCOPE NEMA TC 14.AG is an Adoptive Standard for Reinforced Thermosetting Resin Conduit (RTRC) and RTRC fittings as covered in the most recent publication of CAN/CSA C22.2 No. 2515-09ANSI/UL 2515, Edition 1. Section 2 REQUIREMENTS 2.1 ALL ABOVEGROUND REINFORCED THERMOSETTING RE
23、SIN CONDUIT AND FITTINGS The most current publication of CAN/CSA C22.2 No. 2515-09ANSI/UL 2515, Edition 1, along with Annex A, is adopted in its entirety for all aboveground Reinforced Thermosetting Resin Conduit and RTRC fittings. NEMA TC 14.AG-2015 Page 2 2015 National Electrical Manufacturers Ass
24、ociation Annex A GUIDANCE ON 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 spa
25、cing for a fixed and uniformly 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
26、 per square inch at 73.4F (23C) 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). NOTES
27、hould conduit deflections other 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 s
28、pacing for the last two spans 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 Wher
29、e: R = minimum radius, ft E = bending modulus, psi OD = outside diameter, inches = design stress NEMA TC 14.AG-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
30、 MPa using the following equation: 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
