Section 10-103-B of California’s building energy code (Title 24), http://www.energy.ca.gov/title24/attcp/  has a provision that requires Certified Technicians and Employers to perform Mechanical Acceptance Testing.  The acceptance tests ensure code compliance and promote optimization of efficiency and performance for non-residential buildings. They serve to determine whether specific building components, equipment, systems, and interfaces between systems conform to criteria set forth in the Building Energy Efficiency Standards.
Section 10-103-B also allows certification providers such as NEBB to become certified under this requirement once they submit their programs to the CEC and receive CEC approval.
The requirement for certified technicians will not be mandatory until all participating certification programs achieve a minimum of 300 certified Mechanical Acceptance Test Technicians (MATT).