NEMA FG 1-1993 Fiberglass Cable Tray Systems (Revision No 1 - November 1994)《玻璃纤维光缆托架系统 修改件 1 1994年11月》.pdf

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1、National Electrical Manufacturers Association 2101 L Street, N.W. Suite 300 Washington, D.C. 20037 (202) 457-8400 Fax (202) 457-8411 TO: All holders of FG 1-1993 FROM: NEMA Communications Director RE: Revision 1 to FG 1-1993 DATE: 13 February, 1995 Enclosed please find revision 1 to FG 1-1993. The o

2、ld pages in your FG 1 should be removed and replaced with the corresponding pages included here to bring your standard up to date. A list of effective pages has been included as a guide to which pages in your standard are the most up to date. A new title page has also been included, reflecting your

3、standards updated status. NEMA FG*l 93 6470247 0505788 307 NEMA STANDARDS PUBLICATION NO. FG 1 NATIONAL ELECTRICAL MANUFACTURERS ASSOClATlON H 2lOl L STREET, #W., WASHINGTON, D.C. 20037 NEMA Standards Publication No. FG 1-1993 FIBERGLASS CABLE TRAY SYSTEMS Revision No. 1, November, 1994 Published by

4、 National Electrical Manufacturers Association 2101 L Street, N.W. Washington, DC 20037 O1 994 by National Electrical Manufacturers Association FG 1-1993, Revision 1 List of Effective Pages Pages with a revision numkr of O are originals. Pages with a revision number of 1 were altered in revision 1.

5、Page Number Table of Contents 1 2 3 4 5 6 1 Revision Number O O O O 1 O 1 O Page Number 7 8 9 10 11 12 13 14 15 Revision Number O O O O O O O O O FG 1-1993 TABLE OF CONTENTS Foreword . i Sc0 pe . i Section 1 REFERENCED STANDARDS AND DEFINITIONS . 1 Section 2 MANUFACTURING STANDARDS Materials . 3 Sup

6、plemental Finishes 3 Dimsio ns 3 Protection of Cable Insulation 3 Fittings 3 Working (Allowable) Laad Capacity 5 Load/Span Class Designations 5 Effect of Temperature 5 Destruction Load Test 7 DeflectionTest 7 Data to Appear in Specifications . 9 Data to Appear on Drawings . 9 Installation 9 Deflecti

7、on 11 Finings 11 supports . 11 supportLocations 11 Thermal Contraction and Expansion 12 Warning! Walkways . 12 Section 3 PERFORMANCE STANDARDS AND CLASS DESIGNATIONS Section 4 TEST STANDARDS Section 5 SPECIFICATIONS AND DRAWINGS Section 6 APPLICATION INFOFWATION FG 1-1993 Page i FOREWORD This Standa

8、rds Publication covers fiberglass cable tray systems. Its primary purpose is to encourage the manufacture and utilization of standardized fiberglass cable tray systems and to eliminate misunder- standings between manufacturers and users. This Standards Publication provides technical require- ments c

9、oncerning the construction, test, and pezformance of fiberglass cable tray systems. The development of this publication is the result of many years of research, investigation, and experience by the members of the Fiberglass Cable Tray Section of NEMA. Throughout the development of this publication,

10、test methods and performance values have been related as closely as possible to end-use applications. Almost every item therein, when applied properly, contributes to safety in one way or an- other. The manufacturer of fiberglass cable tray systems in accordance with this publication is, how- ever,

11、only one factor in its safe use. Total safety involves the joint efforts of the various equipment manufacturers, the system designer, the installer, and the user. which are vital to a safe installation: The fiberglass cable tray system manufacturer has limited or no control over the following factor

12、s a. Environmental conditions b. System design c. Product selection and application d. Installation practices e. Maintenance of the system This Standards Publication has been promulgated with a view toward promoting safety to persons and property by the proper selection and use of fiberglass cable t

13、ray systems. It has been developed through consultation among manufacturers and users, to result in improved serviceability, safety, and quality of fiberglass cable tray systems. This publication is in accordance with applicable provisions of the 1993 National Electrical Code, Article 318. This publ

14、ication will be periodically reviewed by the Fiberglass Cable Tray Section of NEMA for any revisions necessary to keep it up to date with advancing technology. Comments or recommended revisions are welcomed and should be submitted to: Vice President, Engineering Department National Electrical Manufa

15、cturers Association 2101 L Street, N.W., Suite 300 Washington, D.C. 20037-1526 SCOPE These standards cover continuous, complete fiberglass systems of ladder ventilated, solid-bottom ca- ble tray or channel type trays, intended for the support of power or control cables, or both. FG 1-1993 Page 1 Sec

16、tion 1 REFERENCED STANDARDS AND DEFINITIONS 1.1 REFERENCED STANDARDS The following publication is adopted, in whole or in part as indicated, by reference in this Standards Publication. American National Standards Institute (ANSI) 11 West 42nd SM New York, NY 10036 National Fire Protection Associatio

17、n (NFPA) Bamrymarch Park Quincy, MA 02269 ANSIPA 70-1993 National Electrical Code 1.2 DEFINITIONS 1.2.1 Fiberglass Cable Tray System A fiberglass cable tray system is an assembly of fiber- glass reinforced plastic cable tray sections and acccesso- ries, that forms a rigid structural system to suppor

18、t cables. 1.2.2 a. b. C. 1.2.3 Fiberglass Cable Tray Types Ladder type A ladder type fiberglass cable tray is a prefabri- cated fiberglass structure consisting of two lon- gitudinal side rails connected by individual transverse members. Trough type A trough type fiberglass cable tray is a prefab ric

19、ated fiberglass structure with a ventilated or solid bottom within integral or separate longitu- dinal side rails. Channel type A channel tw cable tray is a pultruded fiber- glass channel consisting of a ventilated or solid bottom with integral side rails. Cable Tray Section A fiberglass cable tray

20、section is a single length of cable tray, either straight or formed as an elbow, tee, cross, and so forth. 1.2.4 Straight Section A straight section is a fiberglass cable tray section which has no change in direction. 1.2.5 Fittings Fiberglass cable tray fittings are sections which are joined to oth

21、er cable tray sections for the purpose of changing the size or direction of the cable tray system. 1.2.6 Horizontal Elbow which changes direction in the same plane. 1.2.7 Vertical Elbow (Inside or Outside) which changes direction to a different plane. A horizontal elbow is a fiberglass cable tray se

22、ction A vertical elbow is a fiberglass cable tray section a. Inside Vertical Elbow An inside vertical elbow changes direction up ward from the horizontal plane. An outside vertical elbow changes direction downward from the horizontal plane. b. OutsiCie Vertical Elbow 1.2.8 Horizontal Tee A horizonta

23、l tee is a fiberglas cable tray section which is suitable for pining cable tray sections in three direc- tions at 9Odegree intervals in the same plane. 1.2.9 Horizontal Cross A horizontal cross is a fiberglass cable tray section which is suitable for joining cable tray sections in four directions at

24、 %-degree intervals in the same plane. 1.2.10 Reducer (Straight, Right Hand, Left A reducer is a fiberglass cable tray section which is suitabIe for joining fiberglass cable tray sections of dif- ferent widths in the same plane. A straight reducer has two symmetrical offset sides. A right-hand reduc

25、er, when viewed from the larger A left-hand reducer, when viewed from the larger end, Hand) end, has a straight side on the right. has a straight side on the left. FG 1-1993 Page 2 1.2.1 1 Connector A fiberglass cable tray connector is a device which joins fiberglass cable tray straight sections or

26、fittings, or both. The basic types of connectors are: a. Rigid b. Expansion c. Adjustable 1.2.12 Accessories Accessories are devices which are used to supplement the function of straight sections and fittings, and include such items as dropouts, covers, conduit adapters, hold- down devices, adjustab

27、le connectors, dividers, and the like. 1.2.13 Supports A cable tray support is a device which provides de- quate means for supporting fiberglass cable tray straight sections or fittings. The basic types of cable tray supports are: a. Cantilever bracket b. Trapeze c. Individual rod suspension FG 1-1

28、993, Revision 1 Page 3 Section 2 MANUFACTURING STANDARDS 2.1 MATERIALS Fiberglass cable trays shall be made of fiberglass (fiber glass reinforced plastic shapes) which is flame retardant, ultraviolet light resistant and which utilizes a surfacing veil for added corrosion protection in accordance wit

29、h the current edition of the National Electrical Code, Article 318. 2.2 SUPPLEMENTAL FINISHES compatible resin coating. 2.3 DIMENSIONS All edges with exposed glass shall be sealed with a a. Ladder-type trays 1. Lengths of Straight Sections20 feet 53/16 inch, not including connectors if attached 2. W

30、idths-6, 12, 18, 24, 30, and 36 inches, W4 inch inside dimension Overall widths shall not exceed inside widths by more than 4 inches 3. Depths-Inside depths shall be 3 through 7 inches, when consid- ering ap!plications requiring mncenltored slntic load, sec 6.2. NOTE 2 - ?hese designalicms do not ap

31、ply to channel my. and the manufacturer should be consulted. FG 1-1993 Page 6 FG 1-1993 Page 7 Section 4 TEST STANDARDS 4.1 DESTRUCTION LOAD TEST 4.1.1 Test Specimen For each design of fiberglass cable trays, two unspliced straight specimens of the widest width and 12 inches on center rung spacing s

32、hall be tested. Differences in configuration of any part constitute a different design. 4.1.2 Type and Length of Span Test spans shall be simple beam spans with free unre- strained ends. Trays shall not have side restraints. Spans shall be as specified +1 inch. 4.1.3 Orientation of Specimens Specime

33、ns shall be tested in a horizontal position. The total length of the test specimen shall be not more than the specified span length plus 20 percent Any overhang shall be equal. 4.1.4 Supports Each end of the specimen shall be supported by a l/s-inch wide by %-inch high steel bar(s) with a 120 degree

34、 “Vee“ notch cut in its bottom to a depth of 3/16 inch. The “Vee“ notch shall rest on a 1-inch solid round steel bar which is welded at a maximum of 12 inches on center to a fm steel base. 4.1.5 Loading Material Loading material shall be rectangular steel bars, 3/4 inch by 4 inches by 12 inches with

35、 a theoretical weight of 10.2 lb. each or steel strips with a maximum thickness of 1/8 inch, width 1-1/8 inch, and length 4 feet When testing 12 foot spans or less. 4.1.6 Loading All specimens shall be loaded to destruction. The load shall be applied in at least 10 increments which are approximately

36、 equal. Loading shall be uniformly distributed for the length and breadth of the specimen except that the loading material shall be not closer than !4 inch nor further than 1 inch from the innermost elements of the side rails. It shall be arranged across the tray with a minimum of 3/8 inch between s

37、tacks so that the loading material does not bridge transversely. All loading material shall be placed between the supports without overhanging. For loading weights in a ladder-type tray, it shall be permissible to cover the bottom of the tray between supports with a flat sheet of No. 9 gauge flatten

38、ed ex- panded metal not more than 3 feet long and with a wire hole size of 3/4 inch, or a flat sheet of No. 16 gauge sheet steel not more than 3 feet long. The expanded metal or sheet steel shall not be fastened to the tray and shall be no closer than $5 inch to the side rails. The 3-foot lengths sh

39、all not overlap. 4.1.7 Destruction Load Capacity The total weight of the loading material on the fiber- glass cable tray at the time it is destroyed shall be con- sidered to be the destruction load capacity of the cable tray. 4.1.8 Interpolation and Extrapolation of Test When allowable load and defl

40、ection data are deter- mined by load tests, values for span lengths not tested shall be determined by interpolation from a curve based on values for a minimum of three tested span lengths. Extrapolation toward shorter span lengths is permissible but shall not be used for span lengths longer than the

41、 longest span length tested. 4.2 DEFLECTION TEST Data The vertical deflection of the tray shall be measured at two points along the line midway between the supports and at right angles to the longitudinal axis of the tray. The two points of measurement shall be at the midpoint of the span of each si

42、de rail. The average of these two readings shall be considered to be the vertical deflection of the tray. For application information on deflection see 6.1. FG 1-1993 Page 9 Section 5 SPECIFICATIONS AND DRAWINGS 5.1 DATA TO APPEAR IN SPECIFICATIONS appear in all fiberglass cable tray specifications.

43、 The following minimum data, when applicable, should a. Class designatiorr-span/load class (3.2) b. Type (2.3) c. Material (2.1) d. Rung spacing (2.4) e. Inside depth (2.3.3) f. Radius (2.3.5) g. Accessories 5.2 DATA TO APPEAR ON DRAWINGS fiberglass cable tray drawings. The following minimum data sh

44、ould appear on all a. Type (ladder, trough, channel, and so forth) b. Width c. Straight section, fitting, or accessory d. Radii (mixed) e. Elevation (note pint of measurement) f. Vertical and horizontal changes in position g. Clearanc-vertical and horizontal h. Number of trays i. Supports 5.3 INSTAL

45、LATION Products manufactured in accordance with NEMA FG 1 shall be installed per the suggested installation guidelines therein. FG 1-1993 Page 11 Section 6 APPLICATION INFORMATION 6.1 DEFLECTION Under normal applications, deflection limitations should not be included in design criteria for fiberglas

46、s cable tray systems. However, if unusual or special con- ditions exist, the manufacturer should be consulted. Limitations of deflection for aesthetic purpose only can result in an overdesigned tray system. 6.2 CONCENTRATED STATIC LOAD (if required by user) A concentrated static load is not included

47、 in Table 3-2. Some user applications may require that a given concen- trated static load may be imposed over an above the working load. Such a concentrated static load represents a static weight applied between the side rails at midspan. When so specified, the concentrated static load may be con- v

48、erted to an equivalent, uniform load (Wo) in pounds per linear foot (kilograms per meter) using the formula: 2 x (Concentrated Static Load) Span Length, fL(m) wo = and adding to the static weight of cables in the tray. This combined load may be used to select a suitable load/span designation (see Ta

49、ble 3-2). If the combined load ex- ceeds the working load shown in Table 3-2, the manufac- turer should be consulted. 6.3 FllTlNGS Changes in direction should be mechanically continu- ous and accomplished by use of fittings having dimen- sions in accordance with 2.3. 6.4 SUPPORTS Supports for fiberglass cable trays should provide a strength and working load capacity sufficient to meet the load requirement of the cable tray systems. a. Horizontal and vertical tray supports should provide an adequate bearing surface for the tray and should have provisions for holddown clamps or fasteners. b.