Foreword

Specification for construction quality checkout and evaluation of electric equipment installation is a series of standards applied to checkout，acceptance and evaluation of construction quality of electric equipment installation engineering，which comprises 17 parts as following：

—Part 1：General rules；

—Part 2：High-voltage electric equipments；

—Part 3：Power transformers，oil-immersed type reactors and instrument transformers；

—Part 4：Busbar equipments；

—Part 5：Power cable lines；

—Part 6：Grounding devices；

—Part 7：Rotating electrical machines；

—Part 8：Panels，cabinets and secondary circuit wirings；

—Part 9：Batteries；

—Part 10：35kV and below over-head power line installation；

—Part 11：Elevator；

—Part 12：Low-voltage apparatus；

—Part 13：Power converter equipments；

—Part 14：Cranes；

—Part 15：Electric equipments in explosive or inflammable hazardous environment；

—Part 16：1kV and under feeder cable engineering；

—Part 17：Electric lighting devices.

This section is the 15 th part of the series of standards：quality checkout of electric equipment installation in explosive，inflammable or hazardous environment，which is prepared on the basis of Notice on project confirmation of Electric Power Industry Standard Preparation and Revision in 1999（Electric Power〔1999〕No.40）confirmed by State Economic and Trade Commission.

This section is a tabular form of GB 50257 Electric equipment installation engineering Code for construction and acceptance of electric equipments in explosive or inflammable hazardous environment and related national standards and industry-standard，which is an electric power industry standard applied to quality checkout of electric equipment installation in explosive，inflammable or hazardous environment.

This standard is proposed by and under the jurisdiction of Electric Power Construction Research Institute of State Grid.

Chief Development Organization：

　　　　　　Electric Power Construction Research Institute of State Grid

Chief Drafting Staff：

　　　　　　Li Zhigeng　Chen Fayu

Electric Power Construction Research Institute of State Grid is responsible for the explanation of this standard.