One of the greatest problems in the design of a power substation is how to maximize its potential while maintaining safe conditions....
The greatly reduced electrical and magnetic fields as well as the superior dielectric strength of SF6 gas allow for exceptionally compact transmission systems with high power capabilities.

For example, the outside diameter of the enclosure sheath for 362 kV service is only 15 inches (381mm). And since the phases are installed only 22 inches (599mm) apart (center-center), a typical 3 phase system would require a trench of only 6 feet (1.85m) wide. In addition, the right of way width can be reduced to less than 10% of the right of way required by conventional overhead lines.

CGIT systems are more adaptable to tight space limitations than cable systems because CGIT lines can turn corners at extremely sharp angles, unlike the large radius bends required by cable. More significantly, the large current carrying capacity of CGIT allows the combination of outputs from multiple generator step-up transformers into feeder circuits, resulting in more compact transmission line and GIS arrangements than could be accommodated with cable.

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