Conn. Agencies Regs. § 25-129-8
The requirements for registration as a limited geothermal driller W-8 shall be one (1) year as a geothermal driller trainee or possessing equivalent experience and training. Such registration as a limited geothermal driller W-8 permits the registrant to construct a geothermal bore hole or geothermal system, as defined in section 25-128-36(c) of the Regulations of Connecticut State Agencies, up to and including the manifold connection, including, but not limited to, the installation, repair and maintenance of piping, casing, heat transfer media, pumps, pump motors, and valves, but excluding direct exchange systems, as defined in section 25-128-36(c) of the Regulations of Connecticut State Agencies, only while the registrant is in the direct and regular employment of a contractor registered for such work. The applicant shall demonstrate knowledge of well drilling by passing a written examination conducted pursuant to sections 21a-7(a)(1) and 21a-8(a)(5) of the Connecticut General Statutes.
Conn. Agencies Regs. § 25-129-8