The city of Odessa has adopted the 2017 National Electrical Code (NEC), 2018 International Residential Code (IRC), 2018 International Building Code (IBC). When installing a PV system on residential, it shall comply with the 2017 NEC and 2018 IRC. When installing a PV system on a commercial building, it shall comply with the 2017 NEC and 2018 IBC.