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Greetings,
In previous power distribution systems my experience was similar to the suposition Rick expressed. That is that we have to satisfy two ends:
A). To insure a reasonable and reliable level of available power without overloading the power source;
B). To meet safety requirements in a fail safe manner;
will likely require a two stage approach.
For Case A some form of electronic current limiting with a sharp knee using some active device (e.g. FET or three terminal regulator). But as Roger points out silicon on a line is hazzard for failure (zap!). Therefore we employ a second limiter (e.g. big resistor, PTC, fuse) in order to meet safety regulatory requirements for fail safe in preventing overloads, fires, etc.
There's my 2¢.
Arlan
P.S. Tennis? My knees can't take it no more!