As an electrical contractor I work in many old neighborhoods and it's easy to tell when the houses are similar. A lot of houses have Federal Pacific panels and old electrical services, many with the meter in the basement- which hasn't been allowed in 50+ years. Upgrading electrical services is high profit work that any electrician loves.
So here is an example, I just upgraded a customer's service because they just bought the house and the home inspector cited the old service with the meter in the basement and Federal Pacific panel as being possibly dangerous. I notice that there are 12 other houses on that block with the same style house, 60+ year old service, and meter in the basement. So it stands to reason that they also have a Federal Pacific panel in there.
I have a list of houses like this in all the neighborhoods I have worked in over the last year.
It seems like once people learn about the dangers of FPE panels they want to upgrade, but educating them is the problem. That's why I was thinking about sending out some type of postcard or letter. But I don't want to use scare tactics either.
Here is an example of what Electricians Success International (owned by Success Group International) did to get people searching online: Is My Electrical Panel Safe? - Important Information About Federal Pacific Electric, Zinsco and Outdated Electric Panel Boxes
Here is a 6 page document that I could send out: http://www.codecheck.com/cc/ccimages/PDFs/FPE_2012.pdf
The problem is coming up with the wording. Getting the customer to start reading it, keep them reading, but not use shady tactics that could get me into legal trouble. As I mentioned earlier, all it takes is a home inspector telling them that the panel is dangerous, the service is old and undersized, and/or the meter should be outside to get them to want to upgrade it.
Before I get into figuring out the copy, is this a worthwhile endeavor?