Re: change out or not
I don't really care for fuse panels.
That said, fuses don't go bad or wear out. They are either good or blown. They are rated for 100% of their amperage for continuous use.
Only Edison base fuse panels without adaptors will accept fuses that are oversized for the conductors (if the conductors are properly sized for the bases in safety fuse panels or panels with adaptors). If a standard light bulb will fit into the base, it is Edison.
I have only seen one fuse panel with fuses for A/C. Typically, I see where some goofball has landed #10's under the main lugs and run them unprotected to the A/C disconnect. This warrants an immediate change out.
Fuses are expensive and getting a little harder to come by. Edison base fuses have all but disappeared (not fast enough I might add).
I agree that a 200A changeout is the way to go but may be overkill or cost prohibitive. I would say to do a load calculation using the existing situation then add for a range, central air conditioning, and maybe hot water heater if the home does not have any of these on electric. Also put in a panel that allows for at least 4 more circuits than are already there. Don't forget to allow spaces for those second and third wires that always seem to be on one fuse. That will satisfy code about "# of conductors cannot exceed terminal specifications" and will help split up the load. If a 100 AMP panel will still meet the demand and satisfy code, put one in, if it won't go to the 200AMP. 125A and 150A panels will be almost as expensive to install as a 200A.
You would only need to re-run circuits if a ground was desired as existing wiring is grandfathered to the applicable codes at time of original installation (at least here in KY.).
I won't speak to the AFCI issue as that would be the AHJ's call. I have seen it go both ways, but never with a fuse panel to breaker panel changeout.
With a changeout, don't forget that you will have to add an earth ground if the existing service does not have one.
[ February 18, 2006, 10:45 PM: Message edited by: Matt Harp ]