(1) Converter transformer shall be provided with separate perimeter earthing conductor.
(2) The line side neutral of the converter transformer bank shall be earthed at one point only.
(3) Every part of support structure circumference of the air cored reactor shall be earthed in a manner such that it is not forming closed loops.
(4) Radio Frequency Interference screen of valve hall shall be electrically connected and effectively earthed.
(5) Metallic sheet, prefabricated structure members and trusses housing high voltage direct current apparatus shall be electrically connected and effectively earthed.
(6) Insulating pads or sleeves shall be provided between the steel reinforcement components, in foundation beneath the smoothing reactor, wherever they are crossing each other.
Chapter XIII Additional safety requirements for gas insulated substation