Now I would need the input from Kent on the real world, but I know that the code requires anyone working on an installation to take into account the affect on the existing wiring. (This e.g. means that the effect of adding more load to a circuit with only short-circuit protection must be checked)
There is also the general principle of "existing installation" which means that you don't have to upgrade existing wiring that is to old codes, (what you'd call "grandfathered" in the US).
Documentation is conveniently "lost"...
[This message has been edited by C-H (edited 03-10-2003).]
