GB 50217-2007
Code for Design of Cables of Electric Engineering
Implementation Date: April 1,2008
lssue Date:October 23,2007
Foreword
This code was revised from GB 50217—1994 Code for Design of Cables of Electric Engineering, by Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation and the interests concerned in response to the Notice on Printing and Distributing the Preparation and Revision Plan of National Standards for Engineering Construction from 2001 to 2002(JB [2002] No.85)issued by the Ministry of Construction.
The technical contents involved in this revision mainly include:
1. Supplementing the requirements on selection of the number of cores of MV and HV cable.
2. Supplementing the requirements on selection of cable insulation, while deleting the contents related to adhesive impregnated paper insulated cables.
3. Supplementing the requirements on selection of the permissible minimum cross-section of protective ground wire in case of a main core cross-section of 400 mm²<S≤800 mm and S>800 mm². 4. Supplementing the requirements on the cross-section and material of cables in cases where power supply circuit of large current loads consists of multiple parallel-connected cables.
5. Supplementing the general requirements on selection of cable terminals.
6. Supplementing the contents on directly cutting and insulating the metallic layer of cables.
7. Supplementing the requirements on grounding of the metallic layer of three-core cables of AC systems.