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.
Thus when the new federal Congress came to write the Third Amendment to the Constitution in 1789, it had considerable experience and precedent to rely on. There was nothing new about the Third Amendment; it simply declared what had become conventional American wisdom. Gordon S. Wood Alva O. Way University Professor and Professor of History Emeritus at Brown University