How are OG-400 and Standard 400 related?

ICC-SRCC’s OG-400 certification program refers to the requirements, policies and procedures associated with the ICC-SRCC certification program and are specific to ICC-SRCC. ICC-SRCC Standard 400 is a generic standard for these systems that is produced by ICC-SRCC but does not require certification to be conducted by ICC-SRCC. The current version of Standard 400 is known formally as ICC 902/APSP 902/SRCC 400 Solar Pool and Spa Heating Systems Standard, and it was approved by ANSI as an American National Standard in 2017. The OG-400 certification program confirms compliance with the SRCC 400 standard.