The State of Colorado Electrical Board has adopted the 2020 NEC effective August 1, 2020. You have 180 days per the Administrative Rules to transition from 2017 to the 2020 NEC. You may also request a one-time extension in writing if you can’t complete the transition within the 180 days. You may also submit a revision to your already approved plans at the minimum fee of $50 to make the change. Please contact me if you need assistance to do this.
There is a book you can purchase that contains the major changes. It is called “Analysis of NEC code change 2020”
Building Codes & Standards Section
303-864-7836 / 303-864-7857 Fax
1313 Sherman St., Room 320, Denver, CO 80203