It has been proven both theoretically and practically the efficiency of the coil is maximum when its cross section is rectangular shape. EGES do not use low efficiency circular or oval cross sectioned conductors on its own furnaces. All coils are manufactured by using rectangular cross sectioned electrolytic cupper which its conductivity is min. 58. So, the loss of coils is minimised.

Coil inner side is plastered with special pre-coat which can stand up to 1800 °C. Special inflammable and heat resistant fiber glass material is used in order to fix coil winding to each other.

To increase the efficiency and make charging easier, the shape of the furnace is specially designed.