Tender For corrigendum : procurement of firealarm system spares for ntpc auraiya gas powerproject - cpu module,edwards,3-cpu3, power supply module: 3pps/m-230; edwards, single i/p module,siga-ct1,edwards, control relay module,siga-cr,edwards, mounting base,siga-sb,edwards, user interface card,3-rs485, serial comm card,edwards,3-rs232