2　Normative References

The following normative documents contain provisions which，through reference in this text，constitute provisions of this code.For dated references，subsequent amendments to，or revision of，any of these publications do not apply.However，parties to agreements based on this part of this code are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below.For undated references，the latest edition of the normative document referred to applies.

GB 175　　　　Portland Cement and Ordinary Portland Cement

GB/T 1001.1　　　　Insulators for Overhead Lines with a Nominal Voltage Above 1000V Part 2:Ceramic or Glass Insulator Units for D.C.Systems-Definitions，Test Methods and Acceptance Criteria

GB/T 1179　　　　Round Wire Concentric Lay Overhead Electrical Stranded Conductors

GB 2314　　　　General Technical Requirements for Electric Power Fittings

GB 2317.4　　　　Acceptance Inspection，Marking and Packing for Electric Power Fittings

GB 2694　　　　Transmission Line Tower-Technical Requirements for Manufacturing

GB 7253　　　　The String Insulator Units of the Cap and Pin Type Dimensions and Characteristics

GB 14902　　　　Ready-mixed Concrete

GB 50025　　　　Code for Building Construction in Collapsible Loess Regions

GB 50119　　　　Code for Utility Technical of Concrete Admixture

GB 50204　　　　Code for Acceptance of Construction Quality of Concrete Structures

GB 50233　　　　Code for Construction and Acceptance of 110kV-550kV Overhead Transmission Line

GB 50389　　　　Code for Construction and Acceptance of 750kV Overhead Transmission Line

DL/T 685　　　　Basic Requirements，Inspection Specification and Determination Methods of Conductor Stringing Sheave

DL/T 764.4　　　　Cold Forging Hot Dip Galvanizing Bolt and Nut for Tower and Hardware of Transmission Lines

DL/T 768　　　　Manufacture Quality Specification for Electric Power Fittings

DL/T 832　　　　Optical Fiber Composite Overhead Ground Wires

SDJ 226　　　　Specifications for Hydraulic Construction Technology of Conductors and Ground wires of Overhead Lines（tentative）

DL/T 810　　　　Technical Specification for±500kV D.C.Long Rod Composite Insulators

JB/T 9678　　　　Cap and Pin Type Glass Suspension Insulator，Appearance Quality of Glasses

JB/T 9680　　　　Cap and Pin Type Porcelain Insulators for Ground Wires of High Voltage Overhead Lines

JGJ 18　　　　Specification for Welding and Acceptance of Reinforcing Steel Bars

JGJ 52　　　　Standard for Technical Requirements and Test Method of Sand and Crushed Stone（or gravel）for Ordinary Concrete

JGJ 55　　　　Specification for Mix Proportion Design of Ordinary Concrete

JGJ 94　　　　Technical Code for Building Pile Foundations

JGJ 104　　　　Specification for Winter Construction of Building Engineering

YB/T 5004　　　　Zinc-coated Steel Wire Strands