Unclear language in exemption for no electrical system--ADS-B-out-- FAR 91.225(e)(2)

[quietflyer]

Also relevant: from the Federal Register, ProposedRule (explaining the proposed regulation)--- https://www.govinfo.gov/content/pkg/...df/07-4938.pdf

"There are some aircraft, however, that were not originally certified with an electrical system, or that have not been subsequently certified with such a system installed,for which installation of equipment that meets ADS–B Out performance standards is impractical. These aircraft may include certain airplanes, balloons,and gliders. There may be instances where a pilot of an aircraft without an electrical system (such as a glider) may want to operate in airspace where ADS–B Out performance standards would be required under this proposal. The procedures for requesting authorization to enter the airspace where ADS–B is required would be the same procedures used today for aircraft not equipped with a transponder to enter certain airspace. In these cases, an operator may request an ATC authorization to operate in the airspace and the FAA addresses those requests on a case-by-case basis."