supply of underground railway signaling cable size: 12 core x 1.5 sq.mmunderground railway signaling cable size: 12 core x 1.5 sq.mm,supply of underground railway signaling cable unscreened pvc insulated, pvc inner sheathed, armoured and pvc outer jacket with high conductivity, annealed copper conductor, size: 12 core x 1.5 sq.mm. conforming to rdso specn. no. irs: s-63/2014 [rev. 4.0] with latest amendments. inspection by rdso [ warr anty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 2 %age , item category : special (signaling cables) , total po value variatio n permitted: not applicable ] ]