The track can fully handle 20 Amps, but because of field installation conditions such as the quality of existing building wiring, track distance run, number of connections, etc., it is common practice to de-rate the track by 20%.
The 4th Amendment, one of the most contraversial amendments ever drafted, was added to the Bill of Rights on December 15, 1791. The idea of being secure in your home, however, goes back into the Pre-Revolutionary period.
In 1965 Supreme Court Justice William O. Douglas included the Third Amendment as part of a constitutional right to privacy in the opinion he wrote for the Court in the case of Griswold v. Connecticut. There is, however, no Supreme Court case that specifically involves the Third Amendment protection against quartering soldiers in peacetime.