The voting began from 3 pm and will continue till 5 pm.
The party planned next round of voting as none of the three contestants for the top post secured over 50 percent of the total votes cast as required in accordance with the party statute.
NC Acting President Ram Chandra Poudel and senior leader Sher Bahadur Deuba are in the race to become party president in the runoff election.
In the election held on Sunday, senior leader Deuba had received 1564 votes.
Likewise, Poudel had garnered 1160 votes. Likewise, other contestant Krishna Prasad Sitaula had received 324 votes. Altogether, 100 votes were found invalid.
Of the total 3,161 party representatives, only 3148 had cast their votes.
Office of Election Officer established for upcoming election of...