General Design
The CGIT system is intended for 3-phase, 50HZ or 60HZ operation. The system is made in fully assembled and factory tested straight modules of up to 18 meters in length. Changes in direction are accomplished with fabricated elbows, which are pre-assembled in the factory and high-voltage tested prior to shipment.

Each single-phase unit of the CGIT consists of a grounded aluminum enclosure tube that contains a concentric tubular aluminum alloy conductor arranged in a coaxial configuration. The conductor is supported using the reliable CGIT epoxy insulators. For added reliability particle traps are mounted at each support insulator location. Particle traps were pioneered by CGIT and have been an integral part of the CGIT product since the first installation in 1972.

Design Considerations
The design of the CGIT system is based on the following critetia:

CGIT System Characteristics By Voltage Class
The ratings table shows the CGIT characteristics for the various voltage classes offered. The critical dielectric design parameter for GIB systems is usually the lightning impulse requirements (BIL). Another factor influencing the dimensions of the coaxial system is the ampacity rating. For a high ampacity system the current requirements determine the size of the conductor. Thus, the design of CGIT is an optimization of the dielectric requirements, current requirements and material costs.