1、NEMA Standards PublicationNational Electrical Manufacturers Association$16, their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. T
2、he American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American Nat
3、ional Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedure of the American National Standards I
4、nstitute requires that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by: National Electrical Manufactur
5、ers Association 1300 North 17th Street, Rosslyn, VA 22209 g164 Copyright 2012 by National Electrical Manufacturers Association. All rights reserved including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and A
6、rtistic Works, and the International and Pan American Copyright Conventions. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, and without the prior written permission of the publisher. Printed in the United States of America. ANSI C136.20-201
7、2 Page iv Copyright 2012 by National Electrical Manufacturers Association ANSI C136.20-2012 Page v Copyright 2012 by National Electrical Manufacturers Association Table of Contents 1 SCOPE. 1 2 REFERENCES 1 2.1 Normative References . 1 2.2 Informative References . 1 3 DEFINITIONS 1 4 GENERAL 2 4.1 P
8、ole Strength 2 5 SHAFTS . 3 5.1 Composition of Shafts. 3 5.2 Exterior Surface of Shafts. 3 5.3 Direct-burial Poles . 3 5.4 Anchor Base Poles 3 5.5 Poles for Post-top Luminaires . 3 6 BOLT CIRCLES 4 7 LUMINAIRE SUPPORT ARMS 4 8 WIRING AND WIRING ACCESS . 4 8.1 Wiring . 4 8.2 Wiring Access . 4 9 IDENT
9、IFICATION 5 10 PERFORMANCE 5 10.1 General. 5 10.2 Physical . 5 11 BREAKAWAY SUPPORTS . 6 12 POLE DEFLECTION MEASUREMENTS 6 12.1 General. 6 12.2 Method I . 6 12.3 Method II 6 12.4 Method III . 7 ANSI C136.20-2012 Page vi Copyright 2012 by National Electrical Manufacturers Association FIGURES FIGURE 1
10、 BOLT CIRCLE3 FIGURES 2A, 2B, 2C DEFLECTION MEASUREMENT METHODS.8 ANSI C136.20-2012 Page vii Copyright 2012 by National Electrical Manufacturers Association FOREWORD At the time this standard was approved, the ANSI C136 committee was composed of the following members: Acuity Brands Lighting Alabama
11、Power American Electric Lighting Ceravision City of Kansas City, Missouri City of Los Angeles, Bureau of Street Lighting Cooper Lighting Duke Energy Edison Electric Institute EPRI Florida Power and Light FRE Composites Inc. GE Lighting Georgia Power Company Gulf Power Company Hapco Aluminum Pole Pro
12、ducts Holophane An Acuity Brands Company Hubbell Lighting, Inc. Intelligent Illuminations Inc. Kauffman Consulting, LLC LITES National Grid Pacific Northwest National Laboratory Philips HADCO Philips LUMEC PNNL Progress Energy SELC Lighting Shakespeare Composite Structures South Carolina Electric b)
13、 the mounting height; c) support arms, length, weight, effective projected area (EPA), attachment detail, diameter of tenon (1-1/4 in (1.660 in outside diameter) or 2 in (2.375 in outside diameter) nominal pipe size (NPS), and position on pole; d) the weight and EPA of the luminaires (banners ,flags
14、, or other attachments that add to the EPA and weight load on the pole); e) maximum wind velocity at location where pole will be installed and source reference. If velocity is unknown, see AASHTO LTS (Latest version); f) any additional load that may be applied to the pole; g) applicable local or sta
15、tes codes, if different from national codes; h) the number, size, and location of any access openings; i) tenon diameter and length where applicable; j) the color and finish of the pole; and, k) other custom features. ANSI C136.20-2012 Page 3 Copyright 2012 by National Electrical Manufacturers Assoc
16、iation 4.2 Pole Length The pole manufacturer shall determine the length of the pole that will achieve the users required mounting height above grade, unless the user specifies otherwise. The shaft length shall be provided with a tolerance of g114 3 in (g114 75 mm). 5 SHAFTS 5.1 Composition of Shafts
17、 Pole shafts shall be a composite of thermosetting resin reinforced with glass or other fibers of such quantity and orientation as to meet or exceed the performance requirements set forth in section 10. The resin shall be thermosetting resin containing UV inhibitor(s) and pigment throughout. 5.2 Ext
18、erior Surface of Shafts The exterior surface may be finished as specified but shall be free of any exposed surface fibers. The shaft shall be covered with a minimum 1.5 mil dry film thickness (DFT) urethane coating, or equivalent, that resists ultraviolet degradation as specified in clause 10.1. The
19、 shaft surface shall withstand normal conditions of handling, installation, and transportation. 5.3 Direct-burial Poles Poles can be provided with an anti-rotational feature when specified by the user. Poles shall have a minimum embed depth of 10% of mounting height + 2 ft0 in (609 mm) or as determi
20、ned by loading and soil conditions or as specified by the user. The user should be aware of unusual or poor soil conditions and higher than normal EPA loadings that may require greater burial depths. 5.4 Anchor Base Poles Poles designed to be mechanically fastened to a foundation shall be provided w
21、ith an anchor base plate. The total system shall be capable of withstanding the combined forces described in clause 10.2.1. The anchor base plate shall have four radial slots, or, as specified by user, to accommodate anchor bolts on the bolt circle diameter. FIGURE 1 BOLT CIRCLE 5.5 Poles for Post-t
22、op Luminaires These poles shall be provided with a permanently affixed tenon in accordance with ANSI C136.3 or ANSI C136.21. ANSI C136.20-2012 Page 4 Copyright 2012 by National Electrical Manufacturers Association 5.6 Poles for Support-Arm Application These poles shall be provided with a removable c
23、ap to close the top of the shaft. The cap shall remain in place when subjected to maximum wind loads for which the pole is designed. 6 BOLT CIRCLES Bolt circles shall be based on the required loading, or as specified by the user. 7 LUMINAIRE SUPPORT ARMS The physical requirements shall conform to AN
24、SI C136.13, ANSI C136.21, or as otherwise specified by the user. 8 WIRING AND WIRING ACCESS 8.1 Wiring Poles shall permit complete internal wiring from an underground source. The pole shaft shall have internal clearance, or a raceway free of obstruction and sharp edges, of not less than 1.5 in (38.1
25、 mm) diameter for the entire length. The design shall permit installation of supply conductors without damage. 8.2 Wiring Access 8.2.1 Wire Entrance Holes The edges of wire entrance holes and hand holes shall be smooth and free from burrs. For embedded poles, a wire entrance hole with a minimum diam
26、eter of 1.375 in (35 mm) shall be located 24 in (610 mm) below the ground line in line with the hand hole, or as specified by the user. 8.2.3 Hand Holes When specified by the user, poles shall have a covered hand hole of adequate size to provide access to wiring, and not reduce the strength of the p
27、oles to levels below design loads calculated per clause 10.2.1. Hand holes shall be a minimum of 2.0 in (50.8 mm) x 4 in (101.6 mm), unless otherwise specified by the user. Hand hole shall be constructed in a manner that prevents electrical shock such as non-conductive materials or protected or insu
28、lated metal hardware. The vertical location of hand holes shall be centered 18 in (457.2mm) above the ground line, unless otherwise specified by the user. The radial location of hand holes shall be as follows: a) Poles with support arms: 90g113 clockwise from the centerline of the support arm as vie
29、wed from above, unless otherwise specified by the user. b) Poles with post-top luminaires: as specified by the user. ANSI C136.20-2012 Page 5 Copyright 2012 by National Electrical Manufacturers Association The surface dimensions of covers for the hand holes shall exceed the dimensions of the hand ho
30、les by a minimum of 0.25 in (6 mm) or be of sufficient design to prevent the entry of foreign objects larger than 0.04 in (1.0 mm). The hand hole cover shall be secured with sufficient rigidity to tightly lock the hand hole cover onto the pole. 9 IDENTIFICATION Poles shall be provided with a stainle
31、ss steel or aluminum identification tag. The tag shall be located within 11.97 in (304 mm) of the tip (top) of the shaft, unless otherwise specified by the user. Minimum information, unless otherwise specified by the user, shall be: a) Manufacturers name; b) manufacturers catalog number; and, c) dat
32、e of manufacture, month, and year. 10 PERFORMANCE 10.1 General The finished surface of the pole shall resist degradation from the environment in which the pole is installed. The pole shall be tested per ASTM G154 for a minimum of 5000 hours using a QUV “A” lamp with four hours on and four hours off
33、cycle. 10.2 Physical 10.2.1 Bending Strength The pole, with specified luminaire, arms, and other attachments installed, shall have a minimum bending strength of at least 1.5 times the maximum bending moment induced by maximum windage conditions as calculated per AASHTO LTS. When a hand hole is speci
34、fied, the pole shall attain this load with the hand hole in compression and the cover removed. 10.2.2 Deflection The pole shall not exceed a maximum deflection of 15 percent of the length of the pole above the grade line when subjected to the maximum loading as calculated in clause 10.2.1, and as te
35、sted in accordance with test methods listed in section 12. 10.2.2.1Static Deflection Poles designed to support luminaires on arms should have a maximum static deflection (due to weight of arm and luminaire only) of 1% of the pole height above ground line. The slope at the top of the vertical support
36、 should not exceed 0.35 in (8.89 mm) as well. 10.2.2.2 Inspection Poles shall not have visible cracks once installed and loaded per requirements in clause 10.2. 10.2.3 Permanent Deflection The pole shall have no more than 1% permanent deflection for the loading value as calculated in clause 10.2.1.
37、This loading shall be applied for 5 minutes at 77o F (25o C) g114 4o F (1.5o C), with measurement being taken 5 minutes after unloading. ANSI C136.20-2012 Page 6 Copyright 2012 by National Electrical Manufacturers Association 10.2.4 Calculation Method The methods of calculating the forces and bendin
38、g moment acting on the pole systems shall be as described in AASHTO LTS. 11 BREAKAWAY SUPPO RT S Breakaway supports, when specified by the user, shall be designed to carry loads as provided in clause 10.2.1. Dynamic performance under automobile impact shall also be considered. Breakaway approval fro
39、m the Federal Highway Administration (FHWA) can be accomplished through approved testing by an independent testing facility approved by the FHWA. The results shall meet or exceed the requirements described in AASHTO LTS. 12 POLE DEFLECTION MEASUREMENTS 12.1 General The test set-up is illustrated in
40、Figure 2c. There are three methods of measuring deflection on a loaded pole. These are illustrated on Figure 2a and Figure 2b. All three methods can be used simultaneously to allow comparison of independent sets of data. 12.2 Method I As shown in Figure 2a, a cord shall be taped to the base of the p
41、ole-at the ground line and the butt only. In the no-load state, the cord is lined up straight with the centerline of the pole. As the pole is loaded, the base moves and the cord shall be moved at the top of the pole to keep it straight with the base portion. True deflection of the pole shall be dire
42、ctly measured from the cord to the pole at the load point. This method automatically compensates for base movement. 12.3 Method II This method uses fixed reference points for measuring movement of the pole as the pole is loaded. As shown in Figure 2b, the points physically are three posts arranged v
43、ertically on the floor adjacent to the pole. They should not be connected to any load-bearing member of the test fixture. Their lateral distance from the pole is of no importance, but they should not be moved during any one test because their position relative to the length of the pole is important.
44、 The three posts shall be located, as follows: a) Butt b) Ground linevaries with length of the pole c) Load pointusually 12 in (305 mm) from the top of the pole Measurements are made from these posts to the centerline of the pole at each load level. There is movement of the pole base (ground line to
45、 butt) during loading. This movement shall be taken into account when determining the load/deflection characteristics of the pole. Merely subtracting the initial from the final measurement at post 3 (load point) gives a so-called apparent deflection, with no allowance for the movement of the base of
46、 the pole. This apparent deflection is too high a value and would not be the same on any two identical poles. The true deflection can be determined by taking a ratio of the base movement (ground line positive movement added to the butt movement in the negative direction) over the full length of the
47、pole, and subtracting this from the apparent deflection. ANSI C136.20-2012 Page 7 Copyright 2012 by National Electrical Manufacturers Association 12.4 Method III A cord shall be pulled over the centerline of the entire pole when pole is unloaded. As pole is loaded, any movement at the groundline or
48、butt should be recorded and deflections corrected to reflect the movement. The cord should not touch the pole at any time in order for movement readings to be accurately recorded. Pole deflections should be measured from the cord to pole centerline. ANSI C136.20-2012 Page 8 Copyright 2012 by Nationa
49、l Electrical Manufacturers Association FIGURES 2A, 2B, 2C DEFLECTION MEASUREMENT METHODS 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
