28.__Traffic signal module.__"Traffic signal module" means a standard 8-inch or 12-inch traffic signal indicator consisting of a light source, a lens and all other parts necessary for operation.

29.__Transformer.__"Transformer" means a device consisting of 2 or more coils of insulated wire and that is designed to transfer alternating current by electromagnetic induction from one coil to another to change the original voltage or current value.__"Transformer" does not include either:

A.__Transformers with multiple voltage taps, with the highest voltage tap equaling at least 20 percent more than the lowest voltage tap; or

B.__Transformers that are designed to be used in a special- purpose application and are unlikely to be used in general- purpose applications, such as those commonly known as drive transformers, rectifier transformers, auto-transformers, uninterruptible power system transformers, impedance transformers, regulating transformers, sealed and nonventilating transformers, machine tool transformers, welding transformers, grounding transformers or testing transformers.

30.__Unit heater.__"Unit heater" means a self-contained, vented fan-type commercial space heater that uses natural gas or propane and that is designed to be installed without ducts within a heated space, except that "unit heater" does not include any products covered by federal standards established pursuant to 42 United States Code, Section 6291 and subsequent sections or any product that is a direct-vent, forced-flue heater with a sealed combustion burner.

§3602.__Scope

1.__Application.__Except as provided in subsection 2, the provisions of this chapter apply to the testing, certification and enforcement of energy efficiency standards for the following types of new products that are sold, offered for sale or installed in the State and are referred to in this chapter as "covered products":