2 Normative References
The following normative documents contain provisions which，through reference in this text，constitute provisions of this code.For dated references，any subsequent amendments（excluding contents of errata）to or revision of this code does not apply.However，parties to agreements based on 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 13013 Hot rolled plain bars for reinforcement of concrete
GB 1499 Steel for the reinforcement of concrete-ribbed bars
GB/T 699 Quality carbon structural steel
GB 700 Carbon structural steel
GB/T 701 Hot rolled low carbon steel wire rods
GB/T 1001.1 Insulators for overhead lines with a nominal voltage above 1000V—Part 1：ceramic or glass insulator units for A.C.systems—definitions，test methods and acceptance criteria
GB 1000.2 Pin insulators of ceramic material for high voltage overhead lines
GB 772 Technical specifications of porcelain element for high voltage insulators
GB/T 775.2 Test method for insulators Part 2：electrical test methods
GB/T 775.3 Test method for insulators Part 3：mechanical test methods
GB/T 1179 Round wire concentric lay overhead electrical stranded conductors
GB 2314 General technical requirements for electrical power fittings
GB/T 2315 Nominal failing load series and coupling dimensions for electric power fittings
GB/T 2345 Fixing fittings for flexible busbars
GB/T 3428 Zinc-coated steel wires for stranded conductors
GB 2317.4 Test method for electric power fittings—Part 4：acceptance inspection for electric power fittings
GB 2694 Transmission line towers—technical requirements for manufacturing
GB 7253 The string insulator units of the cap and pin type-dimensions and characteristics
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 14902 Ready-mixed concrete
DL/T 683 Nomenclature for fittings model
DL/T 764.4 Cold headed and hot-dip galvanized bolts and nuts for fastening transmission line towers and electric power fittings
DL/T 768 Manufacturing quality of electric power fittings
DL/T 832 Optical fiber composite overhead ground wires
SDJ 226 Specifications for hydraulic construction of conductors and ground wires of overhead electric power lines（tentative）
JB/T 5892 Technical specifications of organic composite insulators for high voltage lines
JB/T 9678 External quality of cap and pin type glass insulator body
JB/T 9680 Disc suspension porcelain insulators for ground wires of high voltage overhead transmission 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
DL/T 5235 Specification for construction and acceptance of±800kV and under DC overhead transmission lines