I was called today to look at giving a quote on adding GFCI receptacles throughout a 148 unit apartment building, in the kitchens and bathrooms, this job is about 60 miles away and we are not scheduled to go through the building for another week. when talking to the owner he advised me that this building was built in the 1940's and that each recept has the potential of 240 volts if not wired properly, he says that he knows this because he first sent in his maintenance guys to do the job, but fried one of the tenants appliances and had to call a contractor in to fix the boo boo, they told him what I just stated as the reason. Any of you guys heard of this before? If so what should I be looking for when I go there? Or do you think the other contractor just gave him a line to get some work out of him? Any ideas? Thanks.