John I am under the impression from the bldg dept that any panel replacement, would require upgrade to current minimum code, which I thought was 60 amps/ 240, I know that when I've done service replacements all I had to do is protect feeders at proper rating for wire size. Most of the apts I rehab. which is to say just repair or replace damaged wiring and broken recept.s calc out at about 30-40a 120, then from my code classes at trade school I thought the minimum was 60amps if you were installing new feeders and panel?