They will play Ajax Amsterdam or holders AZ Alkmaar, who meet in the semi-finals on Thursday, in the final in Rotterdam on April 20.
Jesper Drost gave PEC the lead at the end of a swift attack in the 29th minute but Danish import Kevin Conboy equalised for struggling NEC from a free kick 10 minutes later.
PEC lost their only previous cup final appearance in 1977 when they were beaten in extra time by Twente Enschede.
(Reporting by Mark Gleeson,; Editing by Ed Osmond; mark.gleeson@thomsonreuters.com; +27 82 8257807; Reuters Messaging: mark.gleeson.thomsonreuters.com@reuters.net; To sign up for our Global Sports Forum chatroom, click on https://forms.thomsonreuters.com/global_sports_forum)
