"jim" wrote in message
ps.com...
We have a 1936 5 room house with a 100 amp service w/ circut breakers.
We wil be updating to 200amps service soom. Down the road it
probability 2 rooms add to the house 1 of witch will a bedroom the
other will be a family room (computer). My big question is what to
look at having to done in line of the fuse box or electric work


thanks
jim

circa 1936 is probably BX cable odds of a grounding conductor are not good.
Computers and sensitive electronics do better on dedicated circuits with a
ground.

Check with your building officials to see what your getting yourself into.
Some areas will let you change the service and a few circuits. One that I
know of requires a upgrade to current code.

Do you need surge protection? Lightning protection?
Have the grounding measured, below 10 ohms is better than the min required
of 25 ohms.
My service measures less than 5 ohms. That took a bit of doing. My
electronics are expensive.