Section 5(9) in Tamil Nadu Electricity Grid Code, 2005
(9)EHV/HV Underground Cables: (i) The cable proposed to be connected to the system shall comply with the following(a)Shall be of XLPE (Cross linked Poly Ethylene) type corresponding to IS -7098(Any alternative type of cable developed in due course with same or better performance may be employed after taking clearance from the STU / Commission).(b)The cable conductor shall be of adequate size considering continuous current, short circuit current voltage drop etc and shall correspond to IS s 130(c)Cables shall be provided suitable sheathing, armouring and screening such that these have the requisite mechanical strength and flexibility to withstand the stresses during handling and laying into ducts/ trenches.(d)Prior permission shall be obtained from the appropriate authority for digging trenches and precautions shall be taken to prevent accidents and to preclude accidental cutting of communication cables, other power cables, water, gas and sewage lines in accordance with the provisions of "Part-VIII of the Act".(e)The route maps shall be kept at the substation and markers shall be fixed to trace the cables.(f)Road crossing shall be carried out by providing culverts, huge pipes or Gl pipes.(g)Jointing anti termination shall be carried out in accordance with the relevant standards.(ii)Clearance from Power Telecom Coordination Committee shall be obtained.
