1、 NEMA TC 19 NONMETALLIC RISER U-TYPE GUARDS NEMA Standards Publication TC 19-2001 (R2009) Nonmetallic Riser U-type Guards Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 www.nema.org Reaffirmed October 7, 2009 Copyright 2002 by th
2、e 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 Copyright Conventions. NOTICE AND
3、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 every person participating in
4、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 together volunteers and/or se
5、eks 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, evaluate, or verify the accurac
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8、is 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, NEMA is not undertaking to ren
9、der 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 the advice of a competent prof
10、essional 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 covered by this publication. NE
11、MA 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 any health or safetyrelated in
12、formation in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. TC 19-2001 (R2009) Page i CONTENTS Foreword. ii Section 1 GENERAL 1.1 Scope 1 1.2 Referenced standards.1 Section 2 DEFINITIONS AND ABBREVIATIONS 2.1 Definitions .
13、3 2.1.1 Nonmetallic Riser U-type Guard .3 2.1.2 Qualification Test 3 2.1.3 Quality Control Test 3 Section 3 GENERAL REQUIREMENTS 3.1 Materials5 3.1.1 Nonmetallic Riser U-type Guard .5 3.2 Dimensions and Lengths 5 3.2.1 Length .5 3.3 Belled End.5 3.4 Ribbed Surfaces5 3.5 Workmanship 5 3.6 Inspections
14、 5 3.7 Flammability 5 Section 4 PERFORMANCE REQUIREMENTS 4.1 Qualification Test 9 4.1.1 Sunlight Resistance 9 4.1.2 Flammability 9 4.2 Quality Control Tests.9 4.2.1 Room Temperature Impact Resistance9 4.2.2 Low Temperature Impact Resistance .9 Section 5 TEST METHODS 5.1 Conditioning, Test Conditions
15、, and Sampling.11 5.1.1 Conditioning Test Specimens .11 5.1.2 Test Conditions .11 5.1.3 Sampling .11 5.2 Dimensions .11 5.2.1 Nominal Dimensions .11 5.3 Impact Resistance.11 5.4 Sunlight Resistance Test 11 Section 6 MARKING 6.1 Marking15 Section 7 INSTALLATION 7.1 Installation Procedures .17 Copyrig
16、ht 2002 by the National Electrical Manufacturers Association. TC 19-2001 (R2009) Page ii 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 signific
17、ant requirements 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. The Polymer Raceway Products Section of NEMA, through its members, has worke
18、d (and continues to work) closely with such organizations as ASTM, the Plastic Pipe Institute, appropriate government agencies, testing laboratories and others in the periodic review and revision of this standard for any changes necessary to remain current. Proposed or recommended revisions should b
19、e submitted to: Vice President, Technical Services National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 This Standards Publication was developed by the Polymer Raceway Products Section and most recently reaffirmed by the Section in 2009. Section ap
20、proval or reaffirmation of the standard does not necessarily imply that all section members voted for its approval or reaffirmation, or participated in its development. At the time it was most recently reaffirmed, the Polymer Raceway Products Section was composed of the following members: AFC Cable
21、SystemsNew Bedford, MA Allied Tube ASTM D 1435 as a guide, ten impact specimens of any one size U-type guard shall be exposed outdoors in a fixed, 45 South position to a minimum of 100,000 Langleys.1At the completion of the exposure period, the exposed specimens shall be tested for impact resistance
22、 per paragraph 4.2.1 of these standards. The impact resistance level of the exposed samples shall not be less than 50 percent of the values shown in Tables 5-1A and 5-1B. All other sizes made from the same material shall be considered to meet the sunlight resistance requirements based on sunlight re
23、sistance testing of any one size. 1A Langley is a unit for measuring solar radiation and for timing outdoor exposures. Each Langley unit denotes one gram caloric per sq. cm or 3.69 BTUs per ft2. 180,000 Langleys are approximately equivalent to 12 months exposure at 45 South in Arizona. Copyright 200
24、2 by the National Electrical Manufacturers Association. TC 19-2001 (R2009) Page 12 Table 5-1A Minimum weight drop impact resistance test PVC and flame retardant polyethylene* Room Temperature Test Low Temperature Test Nominal Size at 74F (23C) at 32F (0C) Inches (mm) Ft.-Lbs. Joules Ft.-Lbs. Joules
25、Extra Heavy 2 (25) N/A 150 (203) Duty 3 (51) N/A 260 (353)1-1/2 (38) 300 (407) 75 (102) 2 (51) 300 (712) 75 (102)Heavy Duty 3 (76) 525 (712) 130 (176) 4 (102) 525 (712) 130 (176) 5 (127) 525 (712) 130 (76) 1 (25) 150 (203) 40 (54) 2 (51) 190 (258) 50 (68)Standard Duty 3 (76) 220 (298) 55 (75) 4 (102
26、) 220 (298) 55 (75) 5 (127) 220 (298) 55 (75) * Polyethylene material meeting requirement of section 4.1.2. Table 5-1B Minimum weight drop impact resistance test polyethylene high molecular weight polyethylene Wall 74F 23 C 32F 0C 0F -18C Nominal Metric Thickness Ft.-.lb. Ft.-.lb. Ft.-.lb. Size Desi
27、gnator Inches (mm) (Joules) (Joules) (Joules) 1 (27) 0.125 (3.18) 225 (305) 225 (305) 150 (203) 2 (53) 0.125 (3.18) 525 (712) 525 (712) 300 (407)3 (78) 0.150 (3.81) 525 (712) 525 (712) 300 (407) 4 (103) 0.170 (4.32) 525 (712) 525 (712) 300 (407)5 (129) 0.170 (4.32) 525 (712) 525 (712) 200 (271) 6 (1
28、55) 0.200 (5.08) 525 (712) 525 (712) 200 (271) Copyright 2002 by the National Electrical Manufacturers Association. TC 19-2001 (R2009) Page 13 TupSteel PlateAdjustable Restraint(Relievedtoavoidcontact with tup)Figure 5-1 FLANGE RESTRAINT Copyright 2002 by the National Electrical Manufacturers Associ
29、ation. TC 19-2001 (R2009) Page 14 Copyright 2002 by the National Electrical Manufacturers Association. TC 19-2001 (R2009) Page 15 Section 6 MARKING 6.1 MARKING Each length of U-type guard shall be clearly and durably marked at least every 5 feet with the material designation, nominal size and duty o
30、f the U-type guard, lot control number, and with the name or trademark of the manufacturer, or both. Product meeting the requirements of Section 4.1.2 shall be marked flame retardant. Copyright 2002 by the National Electrical Manufacturers Association. TC 19-2001 (R2009) Page 16 Copyright 2002 by th
31、e National Electrical Manufacturers Association. TC 19-2001 (R2009) Page 17 Section 7 INSTALLATION 7.1 INSTALLATION PROCEDURES The recommended installation is to utilize a lag screw with a cushioned washer. The lag screw installation depth should permit movement of the cable shield due to linear expansion during exposure to wide temperature ranges. For proper installation, refer to the procedures recommended by the manufacturer. Copyright 2002 by the National Electrical Manufacturers Association. TC 19-2001 (R2009) Page 18 Copyright 2002 by the National Electrical Manufacturers Association.
