1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA TC 19-2017Nonmetallic Riser U-type GuardsNEMA Standards Publication TC 19-2017 Nonmetallic Riser U-type Guards Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 2
2、2209 www.nema.org 2017 by the 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. 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 necessarily mean that there is unanimous agreement among e
4、very 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 standards development process. This process brings
5、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 the document and it does not independently test, ev
6、aluate, or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential,
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8、ty 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. In publishing and making this document available, N
9、EMA 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 own independent judgment or, as appropriate, seek t
10、he 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 consult for additional views or information not co
11、vered 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 certification or other statement of compliance with a
12、ny health or safetyrelated 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 19-2017 Page i 2017 by the National Electrical Manufacturers Association. CONTENTS Foreword ii Section 1 General 1.1 Scope 1
13、1.2 Referenced Standards 1 Section 2 Definitions and Abbreviations 2.1 Definitions . 2 Section 3 General Requirements 3.1 Materials 3 3.1.1 Nonmetallic Riser U-type Guard . 3 3.2 Dimensions and Lengths 3 3.2.1 Length . 3 3.3 Belled End . 3 3.4 Ribbed Surfaces . 3 3.5 Workmanship 3 3.6 Inspections 3
14、3.7 Flammability 3 Section 4 Performance Requirements 4.1 Qualification Tests 7 4.1.1 Sunlight Resistance 7 4.1.2 Flammability 7 4.2 Performance Tests 7 4.2.1 Room Temperature Impact Resistance 7 4.2.2 Low Temperature Impact Resistance . 7 Section 5 Test Methods 5.1 Conditioning, Test Conditions, an
15、d Sampling . 8 5.1.1 Conditioning Test Specimens . 8 5.1.2 Test Conditions . 8 5.1.3 Sampling . 8 5.2 Dimensions . 8 5.2.1 Nominal Dimensions . 8 5.3 Impact Resistance 8 5.4 Sunlight Resistance Test 8 Section 6 Marking 6.1 Marking . 11 Section 7 Installation 7.1 Installation Procedures . 12 NEMA TC
16、19-2017 Page ii 2017 by the National Electrical Manufacturers Association. Foreword This standard for PVC (polyvinyl chloride) and PE (polyethylene) nonmetallic riser U-type guards for use in protecting riser cables in utility poles is intended to: a) list dimensions and other significant requiremen
17、ts b) set forth some of the properties of these products c) assist in selecting and obtaining the proper product for a particular need. User needs have been considered through the development of this standard. NEMA TC 19 was approved by the NEMA Polymer Raceway Products Section. Approval does not ne
18、cessarily 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., Mattoon, IL, AFC Cable Systems, a part of Atkore International, New Bedford, MA, Allied Tube and Conduit, a part of Atkore Inter
19、national, Harvey, IL, Champion Fiberglass, Inc., Spring, TX, Electri-Flex Company, Roselle, IL, FRE Composites, St. Andre-dArgenteuil, PQ, Canada, Hubbell Incorporated, Shelton, CT, IPEX Group, Mississauga, ON, Canada, Legrand North America, West Hartford, CT, www.legrand.us Panduit Corporatio
20、n, Tinley Park, IL, Royal Building Products, Shelby Township, MI, Southern Pipe, Inc., New London, NC, www.southern- Southwire Corporation, Carrollton, GA, Thomas & Betts, a member of the ABB Group, Memphis, TN, , Underground Devices, Inc., Northbrook, IL, United Fiberglass of America, Springfie
21、ld, OH, The Plastics Pipe Institute, in particular, was helpful in the development of TC 19. The following were part of a task group involved in the development and updating of NEMA TC 19: IPEX Group Southwire Corporation Plastics Pipe Institute The NEMA Polymer Raceway Products Section will period
22、ically review this standard and revise it as necessary. Proposed or recommended revisions can be submitted to: Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 NEMA TC 19-2017 Page 1 2017 by the National Elec
23、trical Manufacturers Association. Section 1 General 1.1 Scope This standard covers PVC and PE nonmetallic riser U-type guards intended to protect riser cables on utility poles. 1.2 Referenced Standards In this publication, reference is made to the standards listed below. Copies are available from th
24、e indicated sources. ASTM International 100 Barr Harbor Drive West Conshohocken, PA 19428 D3350 Standard Specification for Polyethylene Plastic Pipe and Fittings Materials D618 Standard Practice for Conditioning Plastics for Testing D883 Standard Terminology Relating to Plastics D1435 Standard Pract
25、ice For Outdoor Weathering of Plastics D1600 Standard Terminology for Abbreviated Terms Relating to Plastics D1784 Standard Specification for Rigid Poly (Vinyl Chloride)(PVC) Compounds and Chlorinated Poly(Vinyl Chloride)(CPVC) Compounds F412 Standard Terminology Relating to Plastic Piping Systems D
26、4396 Rigid Poly(Vinyl Chloride)(PVC) and Chlorinated Poly(Vinyl Chloride)(CPVC) Compounds for Plastic Pipe and Fittings Used in Non-Pressure Applications, Specification for Underwriters Laboratories Inc. 333 Pfingsten Road Northbrook, IL 60062 UL 651 Standard for Schedule 40, 80, Type EB and A Rigid
27、 PVC Conduit and Fittings. UL 651A UL Standard for Safety for Schedule 40 and 80 High Density Polyethylene (HDPE) Conduit NEMA TC 19-2017 Page 2 2017 by the National Electrical Manufacturers Association. Section 2 Definitions and Abbreviations 2.1 Definitions Definitions of terms used in this standa
28、rd shall be in accordance with ASTM F412 or ASTM D883, or both. Abbreviations shall be in accordance with ASTM D1600 unless otherwise specified. nonmetallic riser U-type guard: a U-shape profile intended to cover and provide suitable mechanical protection for wires or cables, or both, attached direc
29、tly to utility poles in a vertical direction. qualification test: a non-repetitive evaluation conducted on an existing, modified or new product to determine acceptability. performance test: an in-plant test that is conducted on a given test frequency to determine whether a product is in accordance w
30、ith the specification requirements. NEMA TC 19-2017 Page 3 2017 by the National Electrical Manufacturers Association. Section 3 General Requirements 3.1 Materials 3.1.1 Nonmetallic Riser U-type Guard The nonmetallic riser U-type guard shall be made from (1) poly vinyl chloride (PVC) plastic compound
31、, which meets the minimum cell classification of PVC 12333 as defined in ASTM D1784 or cell class 11321 as defined in ASTM D4396 or (2) PE (polyethylene) plastic compound, which meets the minimum cell classification of PE 335420 C or E as defined in ASTM D3350. Clean, reworked material of the same t
32、ype and grade from the manufacturers own facility may be used, providing that the riser U-type guard produced meets the requirements of this standard. 3.2 Dimensions and Lengths Dimensions of riser U-type guard shall meet the requirements of Table 1 or 2 when determined in accordance with 5.2 and Fi
33、gure 1. Bell lengths shall be in accordance with Tables 1 or 2. 3.2.1 Length The overall length, including the integral bell is commonly 5, 8 or 10 ft. 1 in. Other lengths are acceptable as agreed to by the parties involved. 3.3 Belled End The riser U-type guard shall have one end belled to provide
34、overlapping of individual sections. 3.4 Ribbed Surfaces The riser U-type guard shall be permitted to have a ribbed outer surface to provide better handling. 3.5 Workmanship The riser U-type guard shall be homogeneous throughout and free from visible cracks or other defects. It shall be as uniform as
35、 practicable in color, opacity, density, and other physical properties. 3.6 Inspections The manufacturer shall inspect the riser U-type guard at time of manufacture for compliance to dimensional and performance requirements and for freedom from defects as defined in 4.2. 3.7 Flammability Where flamm
36、ability resistance is required, it shall meet the requirements of 4.1.2. NEMA TC 19-2017 Page 4 2017 by the National Electrical Manufacturers Association. Table 1 Dimensions for PVC Riser U-Type Guards (See Figure 1) (inches) Nominal Size A Minimum B Nominal C Nominal D Nominal Length of Bell Nomina
37、l Extra Heavy Duty (Schedule 80) 2 0.218 2-3/8 4-1/2 2-3/8 2 3 0.300 3-1/2 6 3-1/2 3 Heavy Duty (Schedule 40) 1-1/2 0.145 1-29/32 3-1/2 1-29/32 2 2 0.154 2-3/8 4-1/2 2-3/8 2 3 0.216 3-1/2 6 3-1/2 3 4 0.237 4-1/2 6-1/2 4-1/2 4 5 0.258 5-1/2 7-1/2 5-1/2 4 6 0.280 6-5/8 8-3/4 6-5/8 5 Standard Duty 1 0.
38、100 1-5/16 2-3/8 1-5/16 2 2 0.100 2-3/8 4-1/2 2-3/8 2 3 0.150 3-1/2 6 3-1/2 3 4 0.150 4-1/2 6-1/2 4-1/2 4 5 0.150 5-1/2 7-1/2 5-1/2 4 6 0.150 6-5/8 8-3/4 6-5/8 5 (mm) Nominal Size A Minimum B Nominal C Nominal D Nominal Length of Bell Nominal Extra Heavy Duty (Schedule 80) 2 5.54 60.33 114.30 66.33
39、50.80 3 7.62 88.90 152.40 88.90 76.20 Heavy Duty (Schedule 40) 1-1/2 3.68 48.41 88.90 48.41 50.80 2 3.91 60.33 114.30 60.33 50.80 3 5.49 88.90 152.40 88.90 76.20 4 6.02 114.30 165.10 114.30 101.60 5 6.55 139.70 190.50 139.70 101.60 6 7.11 168.28 222.25 168.28 127.00 Standard Duty 1 2.54 33.34 60.33
40、33.34 50.80 2 2.54 60.33 114.30 60.33 50.80 3 3.81 88.90 152.40 88.90 76.20 4 3.81 114.30 165.10 114.30 101.60 5 3.81 139.70 190.50 139.70 101.60 6 3.81 168.28 222.25 168.28 127.00 NEMA TC 19-2017 Page 5 2017 by the National Electrical Manufacturers Association. Table 2 Dimensions for Polyethylene R
41、iser U-Type Guards (See Figure 1) (inches) Nominal Size A Minimum B Nominal C Nominal D Nominal Length of Bell Nominal Heavy Duty 1 0.125 1-5/16 2-3/8 1-5/16 2 2 0.125 2-3/8 4-1/2 2-3/8 2 3 0.150 3-1/2 6 3-1/2 3 4 0.170 4-1/2 6-1/2 4-1/2 4 5 0.170 5-1/2 7-1/2 5-1/2 4 6 0.200 6-5/8 8-3/4 6-5/8 5 (mm)
42、 Nominal Size A Minimum B Nominal C Nominal D Nominal Length of Bell Nominal Heavy Duty 1 3.18 33.34 60.33 33.34 50.80 2 3.18 60.33 114.30 60.33 50.80 3 3.81 88.90 152.40 88.90 76.20 4 4.32 114.30 165.10 114.30 101.60 5 4.32 139.70 190.50 139.70 101.60 6 5.08 168.28 222.25 168.28 152.40 NEMA TC 19-2
43、017 Page 6 2017 by the National Electrical Manufacturers Association. Figure 1 Dimensions ABDCNEMA TC 19-2017 Page 7 2017 by the National Electrical Manufacturers Association. Section 4 Performance Requirements 4.1 Qualification Tests 4.1.1 Sunlight Resistance Riser U-type guards shall be made from
44、a nonmetallic material that has been demonstrated to have sunlight resistance as defined in 5.4. 4.1.2 Flammability Where required, a riser U-type guard shall meet the flammability requirements of UL 651. 4.2 Performance Tests 4.2.1 Room Temperature Impact Resistance Ten 6-inch (150-mm) specimens on
45、 the surface of which there are no cracks, tears, or other imperfections shall be cut from finished lengths of each size of riser U-type guard to be tested. The specimens, the test apparatus, and the surrounding air shall be in thermal equilibrium with one another at a temperature of 73.4F 3.6F (23C
46、 2.0C) during the test. The test apparatus and method shall be described in 5.3. 4.2.2 Low Temperature Impact Resistance Ten 6-inch (150-mm) specimens on the surface of which there are no cracks, tears, or other imperfections shall be cut from finished lengths of each size of riser U-type guard to b
47、e tested. The specimens shall then be conditioned at the temperature specified in Tables 5 and 6 for 1 hour fully submerged in a liquid medium or 5 hours in a temperature controlled cold chamber. The test apparatus shall be at the ambient temperature of the test area. The samples shall be removed fr
48、om the cold chamber and tested within a maximum of 15 seconds in accordance with 5.3. NEMA TC 19-2017 Page 8 2017 by the National Electrical Manufacturers Association. Section 5 Test Methods 5.1 Conditioning, Test Conditions, and Sampling 5.1.1 Conditioning Test Specimens When conditioning is required, the test specimens shall be conditioned in accordance with Procedure A in ASTM D618. 5.1.2 Test Conditions Tests shall be conducted at ambient temperature of the test area unless otherwise specified. 5.1.3 Sampling Samples shall be selected at random. 5.2 Dimensions 5.2.1 N
