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In article .com,
says...

My two cents:

You can very likely have the panel upgraded to 200A without having to
bring the whole electric system up to current code. But, if you later
then replace all the old wiring, part of the work is going to be
redone, as they have to rip all the wiring from the breakers out of the
panel again and replace it.

When we had a new service and panel put in, we rewired much of the
house, but not all, because some parts were going to be extensively
remodeled, so we could do new wiring in them later.

The electrician kept the box from the old panel in place and used it as
a junction box for the few old circuits that were fed from the new
panel. The new panel was only a couple of feet away, so the wiring to
use the old circuits with the new panel was very simple, just a few runs
of wire a few feet long, from the new breakers to the box from the old
panel.

When it came time for the renovation of the rooms with the old circuits,
the old panel's box was removed, and the new circuits were run directly
to the new panel. The switch-over took less than an hour of
electrician's time for all the circuits that we switched from old to
new.

That was all with permits, inspections, etc.

--
is Joshua Putnam
http://www.phred.org/~josh/
Braze your own bicycle frames. See
http://www.phred.org/~josh/build/build.html