Sec. 15.23  Home-built devices.

    (a) Equipment authorization is not required for devices that are not 
marketed, are not constructed from a kit, and are built in quantities of 
five or less for personal use.
    (b) It is recognized that the individual builder of home-built 
equipment may not possess the means to perform the measurements for 
determining compliance with the regulations. In this case, the builder 
is expected to employ good engineering practices to meet the specified 
technical standards to the greatest extent practicable. The provisions 
of Sec. 15.5 apply to this equipment.