installer certificate holder. Nothing in KRS 227A.010 to 227A.140 shall apply to low-voltage, power-limited installations for control or coordination of interconnected devices separated from a power source by a Class 2 or Class 3 transformer installed by a low-voltage installer certificate holder. The department shall set the standards for experience and testing for issuance of a low-voltage installer certificate by administrative regulation and may charge a fee to be set by the department by administrative regulation but not to exceed the actual cost of issuance of the certificate.