4.4　Earth Grid

4.4.1　The earth grid of the comprehensive telecommunication building may be designed according to Fig.4.4.1，and the ring earth electrode and the voltage balancing net shall be interconnected once at an interval of 5m-10m.

Fig.4.4.1　Forming Way of Earth Grid for the Comprehensive Telecommunication Building

4.4.2　For the comprehensive telecommunication building adopting the ring main earthing conductor，the connection between the earthing conductor and the earth grid may be designed according to Fig.4.4.2.

Fig.4.4.2　Connection of ring rmain earthing conductor and earth grid

4.4.3　Besides at four corners of buildings，the ring main earthing conductor and the ring earth electrode shall be interconnected once every other pillar.