When designing the installation of electric lines and electric equipment must guarantee specified in the standard TCXD 25:1991, TCXD 27:1991 and TCXDVN 394:2007
When designing the installation of power transmission lines and electrical equipment to ensure the provisions of the standards TCXD 25: 1991, TCXD 27: 1991 and TCXDVN 394: 2007