Who is responsible for Construction Phase Witness Install Tests?

• A. Contractor
• B. CxT
• C. Shared
• D. CxA

Answer: (B)

On-site testing during construction is handled by the Commissioning Technician, who conducts and witnesses the installation tests as part of the commissioning team. The CxT is the person on the job site responsible for executing the test procedures, gathering data, and providing witnessed results that prove the installations meet the design and specifications. The Commissioning Authority oversees the overall commissioning process, designs the test plans, reviews results, and signs off on the documentation, but the day-to-day witnessing of construction-phase tests is the responsibility of the CxT. The contractor performs the actual installation and initial testing as required, while the CxA provides supervision and final validation, not the on-site witnessing for every test.