Standard No.:	CECS 31-2006
English Name:	Code for design of steel cable tray engineering
Chinese Name:	钢制电缆桥架工程设计规范
Chinese Classification:	P62    Power transmission and transformation engineering
Professional Classification:	CECS    Engineering Construction Standard
ICS Classification:	29.24 29.24    Power transmission and distribution networks 29.24
Issued by:	CECS
Issued on:	2006-6-25
Implemented on:	2006-8-1
Status:	superseded
Superseded by:	T/CECS 31-2017 Technical specification for steel cable supporting system engineering
Superseded on:	2018-3-1
Abolished on:	2018-3-1
Superseding:	CECS 31-1991 ENGINEERING DESIGN STANDARDS OF STEEL-MADE CABLE TRAY
Language:	English
File Format:	PDF
Word Count:	12000 words
Price(USD):	300.0
Delivery:	via email in 1 business day

1 General Provisions 1.0.1 This code is formulated with view to enabling the steel cable tray (hereinafter referred to as cable tray) to have advanced technology, economic feasibility, safety and usability and high quality in the design, manufacturer and project application. 1.0.2 This code is applicable to design and construction of cable tray engineering as well as cable tray manufacture, test and inspection with regards to industrial and civil buildings. 1.0.3 Cable tray engineering design shall be closely cooperated with building and structure, technique and other disciplines concerned to determine the optimal cable tray route layout. 1.0.4 The cable tray products shall not be used only if they are inspected and confirmed to be qualified by state-approved quality inspection units; the trial production of new cable tray products shall be identified or evaluated. 1.0.5 If cable tray is used in the cable laying project, it shall not only comply with the requirements stipulated in this code but the provisions stated in current related standards. 2 Terms 2.0.1 Cable supporting system Continuous rigid structural system composed of cable tray, accessories and support post, used to support the cable line. 2.0.2 Cable tray Rigid groove-shaped parts (straight-way and bend-way cable tray and stair-type cable tray). 2.0.3 Hole cable tray Groove-shaped parts composed of hole base plate and side edge, or made of a whole piece of steel plate punched and backwards bent. 2.0.4 Cable tray without hole Groove-shaped parts composed of base plate and side edge, or made of a whole piece of bent steel plate. 2.0.5 Compounding cable tray Groove-shaped parts bolted or spliced by any combination. 2.0.6 Stair-type cable tray Rigid stair-like parts composed of side edge and several crosspiece. 2.0.7 Straight-way A length of cable tray and stair-type cable tray in one direction. 1 Equal radius straight-way A length of straight-way with constant physical dimension. 2 Different radius straight-way A length of straight-way with different physical dimensions. 2.0.8 Bend-way cable tray A length of cable tray and stair-type cable tray in different directions. 1 Horizontal bend-way cable tray Parts at the same horizontal plane and used to change the direction of cable tray and stair-type cable tray. 2 Horizontal 3-way cable tray Parts at the same horizontal plane, used to connect the cable tray and stair-type cable tray in three directions spaced by 90°. 3 Horizontal 4-way cable tray Parts at the same horizontal plane, used to connect the cable tray and stair-type cable tray in four directions spaced by 90°. 4 Upper bend-way cable tray Parts changing the directions of cable tray and stair-type cable tray from horizontal plane upwards. 5 Down bend-way cable tray Parts changing the directions of cable tray and stair-type cable tray from horizontal plane downwards. 6 Vertical 3-way cable tray Parts at the same vertical plane, used to connect the cable tray and stair-type cable tray in three directions spaced by 90°. 7 Vertical 4-way cable tray Parts at the same vertical plane, used to connect the cable tray and stair-type cable tray in four directions spaced by 90°. 2.0.9 Bend-way radius Radius of inscribed circle shared by two right-angle internal side of the bend-way cable tray (bending radius for short). 2.0.10 Fold-type bend-way cable tray Bend-way cable tray made of a straight section formed by two tangent points on inscribed circle shared by two right-angle internal sides of the bend-way cable tray. 2.0.11 Arc-type bend-way cable tray Bend-way cable tray made of an arc section formed by two tangent points on inscribed circle shared by two right-angle internal sides of the bend-way cable tray. 2.0.12 Accessories Parts functioned as connection between straight-way cable trays and between straight-way cable tray and bend-way cable tray, so as to form a fixed connection required by continuous rigid structure system or supplement straight-way and bend-way cable trays functions (accessory for short).

Foreword I 1 General Provisions 2 Terms 3 Cable Supporting System 3.1 Composition of Cable Supporting System 3.2 Structure Type and Variety of Cable Tray 3.3 Accessories 3.4 Support Post 3.5 Model and Specification 3.6 Technical Requirements 3.7 Test 3.8 Inspection 3.9 Valuation, Marking, Packing, and Storage 4 Engineering Design for Cable Supporting System 4.1 Type Selection of Cable Supporting System 4.2 Specification Selection of Cable Tray and Stair-type Cable Tray 4.3 Selection of Load Class 4.4 Selection of Surface Anti-corrosion Treatment Mode 4.5 Arrangement of Support Post 4.6 Fire Prevention 4.7 Earthing 4.8 Documents for Engineering Design of Cable Supporting System Appendix A Calculation Method for Structural Strength of the Cable Supporting System Appendix B Load Test of Cable Supporting System Appendix C Test Method for Adhesion Amount of Hot Dip Galvanized Coating (Gravimetric Method) Appendix D Test Method for Homogeneity of Hot Dip Galvanized Coating (Copper Sulfate Test) Appendix E Hammer Test Method for Adhesiveness of Hot Dip Galvanized Coating Appendix F Contact Resistance Test Appendix G Classification of Environment Conditions Explanation of Wording in This Code