How often is the NESC revised?
From 1973 to 1993, the NESC was revised on a 3-year revision cycle. In 1993, the NESC Committee approved extending the revision cycle for the next edition of the NESC from three years to four years. The NESC 1997 Edition, (C2-1997), was published August 1, 1996. At its 21 May 1996 meeting, the NESC Main Committee met to consider the appropriateness of changing the revision cycle to five years. By letter ballot, a 5 year revision cycle was approved, commencing with the NESC 2002 Edition. The NESC is revised every 5 years.
