Running Contract for supply of Railway Signalling Cable, PVC insulated and sheathed 1. 1 KV grade unscreened copper conductor high conductivity underground armoured annealed size- 12 Core x 1. 5 sq. mm conforming to RDSO Specification No. IRS: S- 63/ 2014 ( Rev. 4. 0 ). identification plan as per clause no 3. 2. 5 of specification