Electricity is complex. In an older home there can be all sorts of issues: knob and tube, two conductors without the equipment ground. Generally, an inspector or an electrician has to try to figure that out, as so much of th system is only visible in the attic or the crawl space. However, here is a quick assessment tool that you might find handy. You should always be able to find the electric meter outside the home. The shape of the meter housing gives you some clues. For example, first on the left, round, is an old meter and this is designed to deliver a mere 60 amps of service (quite antiquated for most homes). The one in the center, square, is a bit harder to quantify but would deliver 100 to 175 amps, which might be fine for the home. The rectangular one, to the right, is a modern 200 amp service.
Caveat: Generally speaking, a service is only rated for the lowest capacity component. So, a system might have a new 200 amp meter, yet still have an outdated 60 amp fuse panel inside the house. Or the panel inside might have been upgraded to a 200 amp panel, with the meter outside still at 60 amps. These scenarios are not likely if the municipal code inspectors were involved, but in this business I have learned to take nothing for granted. However, for ball park estimates of the probable age and capacity of the electrical system, I think this information might be of use to realtors who are trying to figure out what they are dealing with at some of the properties out there.

60A 100-175A 200A
Thanks for dropping by.
Steven L. Smith
www.kingofthehouse.com
Bellingham WA property inspection
Steven, Thanks for the post. I had no idea about this. Now, I'll be looking outside as well as in for the real scoop on the electric.