Instrumentation cable annealed tinned copper conductor with PVC insulated type 'C' colour core number printing will be provided for identification core twisted to form a pair and the pair will be laid up to form a round symmetrical shape plain polyster tape and screened by annealed tinned copper wire braided / or Aluminium miller tape, with 95% coverage. Innersheath will extruded P.V.C. (ST 1) armour with G.I. wire 1.0mm. outersheath with P.V.C.