The Election Commission made tight security arrangements for Nandyal by-election polling on Wednesday. The voters can cast their vote from 7 am to 6 pm. The EC arranged 255 polling stations in Nandyal Assembly constituency and using Voter Verifiable Paper Audit Trail machines so that voters can know for which party did they cast their vote. 15 candidates are in by-election fray and counting of votes will take place on August 28. The EC officials warned of taking serious taken if anyone violates the poll code.