Originally Posted by Shockerengr
I wouldn't go by that... My rental was built mid-50's and only has a 60 amp service. The duplex's we rent down the street were built in the early 80's and have 200amp service, but my house built 10 years later and 3 doors down only has a 100amp service.
Hence the disclaimer of me not being a professional electrician.
I changed my service from 60 amp fuses to 200 amp breakers, to include new ground spike, service entrance cable, grounds to plumbing, meter socket and replacement of knob/tube wiring and receptacles/switches throughout the house, right up to running the new service-entrance cable to the mast head. When it came time to connect it to the street line, that is where I called an electrician.
It was the norm in those years, but not a hard and fast rule to go by. 100 amp written on the box is a good indication, though.
Bottom line is that, if one is having a difficult time even determining what the amperage of one's service is, it is probably best to get an electrician involved. There is no shame in not wanting to get electrocuted or burn one's house down and it would certainly NOT be worth the savings of doing it one's self.